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EP0161545A1 - Apparatus for locating persons for an electronic timepiece - Google Patents

Apparatus for locating persons for an electronic timepiece Download PDF

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Publication number
EP0161545A1
EP0161545A1 EP85104910A EP85104910A EP0161545A1 EP 0161545 A1 EP0161545 A1 EP 0161545A1 EP 85104910 A EP85104910 A EP 85104910A EP 85104910 A EP85104910 A EP 85104910A EP 0161545 A1 EP0161545 A1 EP 0161545A1
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EP
European Patent Office
Prior art keywords
signal
transducer
frame
terminals
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85104910A
Other languages
German (de)
French (fr)
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EP0161545B1 (en
Inventor
Bui Ngoc Chau
Claude-Eric Leuenberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asulab AG
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Asulab AG
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Publication date
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Publication of EP0161545A1 publication Critical patent/EP0161545A1/en
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Publication of EP0161545B1 publication Critical patent/EP0161545B1/en
Expired legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G21/00—Input or output devices integrated in time-pieces
    • G04G21/04—Input or output devices integrated in time-pieces using radio waves
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems

Definitions

  • the present invention relates to people search devices. It relates, more particularly, to a miniaturized research apparatus capable of taking place in a watch.
  • People finders are well known. They include a frame or coil constituting an antenna capable of detecting a coded magnetic field coming from a transmitter located at a relatively short distance (a few tens of meters). If the code received corresponds to the device code, stored in a memory, a transducer produces an acoustic signal, possibly accompanied by an optical signal, warning the wearer of the device that he must, for example, dial a number phone.
  • patent CH 533 332, or the corresponding patent DE 21 49 535 mentions the possibility of including in a electronic watch a search device for people without however describing an embodiment thereof.
  • US Pat. No. 3,937,004 describes a watch provided with a person search device, operating intermittently to save current.
  • the means for picking up the external electromagnetic wave and those necessary for producing the sound signal are however not described in detail. Mention is simply made of an antenna and a sound transmitter, without specifying their nature.
  • application CH 639 816 describes an analog watch in which the motor coil is used between the driving pulses as a magnetic field detector. However, these are parasitic magnetic fields that can occur at different frequencies, making the tuning of the coil uninteresting.
  • the main object of the present invention is to avoid these drawbacks by eliminating the tuning capacity of the frame and the tuning inductor of the piezoelectric transducer without reducing the performance of the people search device.
  • a research facility includes a transmitter and a series of receiver devices carried by people.
  • the transmitter radiates a sine magnetic field or carrier wave, coded for example by an amplitude modulation, having a well-defined carrier frequency and sufficient power to reach the receivers within a given radius. All the receiving devices are tuned to the same carrier frequency, but a device responds to the transmitted wave, for example by an acoustic signal, only if the wave code corresponds to the device code, written in a memory. . Each device responds to a different code. If several groups of devices are to operate in neighboring regions, each group will be assigned a different carrier frequency.
  • the frequency f of the carrier wave is between 28 and 55 kHz, while the frequency f of the acoustic signal is between 1 and 2 kHz.
  • Figure 1 shows the block diagram of a receiving device known people search. It includes a frame or coil 1, of self induction L c , acting as an antenna to pick up the magnetic field.
  • the voltage induced in the frame by the field can be increased, in a known manner, by tuning the carrier frequency f to the self L c of the frame using a capacitor 2 of capacitance C c connected to its terminals.
  • This voltage then multiplied by the quality factor Q c of the frame measured at the frequency f 0 , is applied to the input of a very selective high frequency amplifier 3, tuned to this same frequency f 0 using, for example example, a ceramic or quartz filter.
  • the output of amplifier 3 is connected to the input of a demodulator 4 which provides on its output a signal 4S formed of a series of pulses, corresponding to the positive half-envelope of the modulated carrier wave.
  • a demodulator 4 which provides on its output a signal 4S formed of a series of pulses, corresponding to the positive half-envelope of the modulated carrier wave.
  • Each arrangement of the 4S signal pulses corresponds to a specific code.
  • the signal 4S is applied to the input of a decoder circuit 5.
  • This includes a memory in which the code of the device is written and means making it possible to compare this code with that transmitted by the signal 4S. If the comparison shows that these two codes are identical, the signal 5S at the output of the decoder 5, normally being in the low logic state, passes for a short time to the high logic state.
  • a bistable flip-flop 6 receives the signal 5S on its state input S, which has the effect of putting the output Q of this flip-flop in the logic high state if the output of the decoder 5 is in the same state .
  • the signal 5S is also applied to the input of a monostable flip-flop 7 the output of which is normally in the low logic state.
  • This output goes briefly to the high logic state t 21 seconds after each transition of the signal 5S from the low logic state to the high logic state.
  • the signal taken from the output of the monostable 7 is applied to the reset input R of the flip-flop 6, the output Q of which is thus brought to the low logic state after each pulse of this signal.
  • the output Q of this flip-flop, on which the signal 6Q appears is connected to an input of an AND gate 9 with two inputs, the other input of this gate being connected to the output of a generator 8 providing a signal of acoustic frequency f 1 .
  • the output of the AND gate 9 is connected to the input of a power amplifier 10, equivalent to a source of electrical energy having two output terminals S 1 and S 2 . Between these output terminals is connected a circuit formed by the series connection of an inductor 12 with inductance L and a piezoelectric transducer 11.
  • An example of a coded magnetic field emitted by the transmitter of the paging system is represented as a function of time by the E wave in FIG. 2. It comprises a carrier wave modulated in amplitude by all or nothing, forming a series of programs of equal duration, distributed over time in accordance with a rule which defines the different codes of the coding system.
  • the magnetic field emitted by the emitter induces in frame 1 of FIG. 1 a voltage of the same shape as the E wave. If the frame 1 is tuned by the capacitor 2, the voltage obtained is of the order of a few tens of microvolts.
  • the voltage induced in frame 1 takes the form of the signal 4S shown in FIG. 2.
  • the same signal is also shown in FIG. 3 over a longer period. It consists of a series of pulse trains, each train defining the transmitted code. The first pulse train begins at an instant T 0 and ends at an instant T 1 . Likewise, the second train begins at an instant T 0 'and ends at an instant T 1 '.
  • the third train of pulses shown begins and ends respectively at time T o "and T 1 ".
  • the duration T 1 - T 0 , T 1 '- T 0 ' of each pulse train is constant, as well as the duration T '- T, T 0 "- T 0 ' separating two consecutive trains.
  • the pulse trains follow one another until the person sought has replied or the broadcast stops after a predetermined time.
  • this circuit will deliver a short pulse at a time which immediately follows time T 1 , as indicated by the signal 5S represented in FIG. 3.
  • This pulse applied simultaneously to the inputs of flip-flops 6 and 7, will put the output Q of the first in the high logic state, as shown by the signal 6Q, and the output of the second in the low logic state.
  • Gate ET 9 receiving on a input signal 6Q, will pass the signal produced by generator 8, applied to the other input, to the input of amplifier 10.
  • This signal will last t 21 seconds, up to an instant T 2 , time necessary for the output of the monostable flip-flop 7 to pass a brief instant from the low logic state to the high logic state in order to return to the logic state. down the output Q of the flip-flop 6.
  • An input of the AND gate 9 being from the moment T 2 in the low logic state, the signal from the acoustic generator 8 is blocked and can no longer excite the transducer 11.
  • the acoustic signal definitively ceases at time T 2 if the person called takes the necessary steps before this time, for example by dialing a telephone number, to stop the transmission. Otherwise, a second pulse train, identical to the first, is sent from time T 0 ', triggering, at time T 1 ', a second acoustic call which lasts until time T 2 '.
  • the circuit of FIG. 4 having two terminals A and B, shows the equivalent diagram of the piezoelectric transducer 11 and the chord inductor 12 of value L o , connected in series.
  • This diagram includes a static capacitance C 0 at the terminals of which is connected a motional branch composed of a self L 1 , of a resistance R 1 and of a capacitance C 1 .
  • the static capacitance C 0 is equal to the capacitance existing between the electrodes of the transducer, while the vibratory properties of the transducer are represented by the parameters L 1 , R 1 , C 1 of the motional branch.
  • the operational capacity C 1 is approximately 1000 times lower than the static capacity C 0 , the value of which can vary, depending on the form of the metallizations, between 1 nF and 50 nF in a watch transducer.
  • the frame 1 for its part, produced in horological dimensions, can typically be circular in shape, have a diameter of the order of 25 mm and contain a thousand turns of a wire of around 50 micrometers in diameter.
  • the self L of such a frame is then between 10 mH and 50 mH.
  • the capacitance C 0 can thus very well be suitable for granting the self L c of the frame. Indeed, with the limit values that can taking these two components, it is possible to cover a frequency range from 3 kHz to 50 kHz, containing that used in paging installations.
  • One of the aims of the present invention being to remove the tuning capacitor 2 from the frame, it can be seen that it can be achieved by using the capacitance C 0 of the transducer 11 for this function.
  • the choke 12 can be replaced by the frame 1.
  • the efficiency of the frame at the acoustic frequency f 1 which is about twenty times lower than f, cannot be good while bringing some improvement compared to a direct attack on the transducer 11 by amplifier 10.
  • an additional capacitor 13 of capacitance C ' can be connected in parallel on C 0 , as shown in FIG. 4.
  • the additional capacitor 13 can be a second piezoelectric transducer having a static capacitance C o '. It is possible to produce the two transducers in the form of a single element having two faces and having a common electrode on one face and two electrodes on the other face, each of these latter electrodes defining one of the transducers.
  • frame 1 either as a magnetic wave sensor or as a chord inductor of the transducer 11 and the use of this transducer either as an acoustic emitter or as a chord capacitor of frame 1 is only possible if a switching circuit is used to connect the frame and the transducer adequately to fulfill these various functions.
  • FIG. 5 represents the block diagram of a watch, for example digital, provided with a people search circuit according to the invention.
  • the watch part of conventional design, comprises a quartz 20 serving as a time base, a maintenance circuit 21, a counter 22, a driving circuit 24 and a digital display 25.
  • the quartz 20 is connected to the maintenance 21, the assembly forming an oscillator.
  • the signal at the output of the maintenance circuit is applied to the input of the counter 22 which has a main output SI and two auxiliary outputs S 2 and S 3 * On these last two outputs appear a high frequency signal formed by pulses and an acoustic frequency signal.
  • the output SI provides, for its part, a signal containing the time information. It is applied to the input of the driving circuit 24 which generates the signals necessary for indicating the time by the display 25 to which it is connected.
  • the people search part of figure 5 includes elements 1, 3, 4, 5, 6, 9 and 10, already described in connection with figure 1 and connected in the same way in the two figures.
  • the monostable lever 7 of FIG. 1 has been replaced, in FIG. 5, by a counter 23 of simpler construction.
  • This counter 23 receives, on one input, the pulses coming from the output S 2 of the counter 22 of the watch and, on another input, the signal 5S.
  • Each pulse of signal 5S resets counter 23 to zero then triggers the counting.
  • the counter 23 produces a pulse on its output, which is connected to the input R of the flip-flop 6.
  • the time required to fill this counter corresponds to the time interval t 21 , previously determined by the monostable rocker 7.
  • the input of the AND gate 9 which was connected in FIG. 1 to the output of the acoustic frequency generator 8, is connected in the circuit of FIG. 5 to the output S 3 of the counter 22 which supplies a signal of the same frequency.
  • the circuit for switching the frame 1 and the transducer 11 already mentioned, is represented by block 15 in FIG. 5.
  • This circuit has three inputs E 1 , E 2 , E 3 and three outputs S 1 , S 2 , S 3 .
  • the inputs E1 and E 2 are respectively connected to the outputs S 1 and S 2 of the amplifier 10.
  • the input E 3 receives the signal 6Q coming from the output of the flip-flop 6.
  • the output S 1 of the circuit 15 is connected to a terminal of frame 1.
  • the output S 2 of this same circuit is connected to a terminal of a capacitor 14 having a capacity equal to the capacity C o 'of the capacitor 13 of FIG. 4.
  • the other terminal of this capacitor is connected to one terminal of the transducer 11 and to the other terminal of the frame 1.
  • the frame 1, the transducer 11 and the capacitor 14 thus have a common terminal.
  • the output S 3 , the input E 1 and the other terminal of the transducer are connected together.
  • the circuit 15 essentially comprises two switches A and B actuated by relays not shown.
  • the first switch is connected to the output S 1 and the second to the output S 2 .
  • the switch A can occupy two positions at 1 and at 2 . In position a l , the switch closes a contact which links the output S 1 with the input E 1 . In position a2, this output is connected to input E 2 .
  • Switch B can also occupy two positions b 1 and b 2 . In position b 1 , the switch does not close any contact and the output S 2 remains floating, while in position b 2 , this output is connected to input E 1 .
  • the relays, not shown, actuating the switches A and B are controlled by the signal 6Q shown in FIG. 3.
  • This signal is applied to the input E 3 of the circuit 15. It will be assumed that at a low logic state of the signal 6Q correspond the positions a 1 and b 1 of switches A and B and that at a high logic state of this signal correspond the positions a 2 and b 2 of these same switches.
  • the operation of the people search part of the circuit of FIG. 5 is as follows. In the absence of any coded search signal E, the signals 4S, 5S, and 6Q of FIGS. 2 and 3 all remain in the low logic state. This has the effect of putting the switches A and B respectively in the positions a 1 and b 1 . The two terminals of the transducer 11 are then connected to the two terminals of the frame 1 and one terminal of the capacitor 14 is made floating. The frame is tuned, under these conditions, by the static capacitance of the transducer on the carrier frequency f 0 of the signal E, making unnecessary the tuning capacitor 2 shown in FIG. 1.
  • the circuit 15 remains in this state until a coded signal received by the frame 1 is recognized by the decoder 5.
  • the output Q of the flip-flop 6 then goes to the high logic state at the instant T l causing the switching of switches A and B respectively in positions a 2 and b 2 .
  • the outputs S 1 and S 2 of the amplifier 10, which acts as a source producing an acoustic frequency signal, are then connected, by the switch A, to the terminals of the transducer 11 through the frame 1, making the choke 12 unnecessary. of FIG. 1.
  • the capacitor 14 of capacity C 0 ' is connected, for its part, directly to the terminals of the transducer by the switch B.
  • the transducer being excited by the amplifier 10, it will emit an acoustic signal d 'call in the best performance conditions.
  • This call signal will be transmitted for t 21 seconds.
  • the output Q of the flip-flop 6 passing to the low logic state the transducer 11 will again be connected to the terminals of the frame 1, as at the start of the cycle. If the call signal has remained unanswered, a new cycle, identical to the previous one, will be triggered from time T 0 '.
  • the present invention is not limited to the single embodiment of a person search device which has just been described, but the scope of this patent also extends to the variants of the various circuits remaining within the framework of equivalences.
  • the operation of the circuit 15 in FIG. 5 has been described using contacts to facilitate understanding.
  • the contacts can be replaced in a known manner by electronic switching devices such as transistors and transmission gates.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Clocks (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Near-Field Transmission Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

A pager is described for use in an electronic watch. The pager comprises a frame (1) for picking up a magnetic signal and a piezoelectric transducer (11) having a static capacitance on its terminals, for producing a sound. 11 To improve sensitivity of reception, a switching circuit (15) connects the transducer (11) in parallel with the frame (1) to tune it by means of the static capacitance to the frequency of the magnetic signal carrier wave. To increase the performance of the transducer (11 ) when it operates as a sound transmitter, the switching circuit (15) connects the frame (1) in series with the transducer (11).

Description

La présente invention se rapporte aux appareils de recherche de personnes. Elle concerne, plus particulièrement, un appareil de recherche miniaturisé capable de prendre place dans une montre.The present invention relates to people search devices. It relates, more particularly, to a miniaturized research apparatus capable of taking place in a watch.

Les appareils de recherche de personnes sont bien connus. Ils comportent un cadre ou bobine constituant une antenne capable de détecter un champ magnétique codé provenant d'un émetteur situé à une distance relativement faible (quelques dizaines de mètres). Si le code reçu correspond au code de l'appareil, inscrit dans une mémoire, un transducteur produit un signal acoustique, éventuellement accompagné d'un signal optique, avertissant le porteur de l'appareil qu'il doit, par exemple, composer un numéro de téléphone.People finders are well known. They include a frame or coil constituting an antenna capable of detecting a coded magnetic field coming from a transmitter located at a relatively short distance (a few tens of meters). If the code received corresponds to the device code, stored in a memory, a transducer produces an acoustic signal, possibly accompanied by an optical signal, warning the wearer of the device that he must, for example, dial a number phone.

Ces appareils ont la forme de petites boites pouvant facilement prendre place dans une poche. Elles contiennent, outre le cadre et le transducteur, divers circuits électroniques et des batteries assurant leur alimentation. Un appareil de recherche sera d'autant plus intéressant qu'il aura des dimensions petites, qu'il pourra détecter un champ magnétique faible, qu'il émettra un signal acoustique puissant, qu'il consommera peu d'énergie et enfin que son prix de revient sera bas.These devices are in the form of small boxes that can easily take place in a pocket. They contain, in addition to the frame and the transducer, various electronic circuits and batteries ensuring their supply. A research device will be all the more interesting as it will have small dimensions, it will be able to detect a weak magnetic field, that it will emit a powerful acoustic signal, that it will consume little energy and finally that its price cost will be low.

Pour obtenir une sensibilité maximale du cadre vis-à-vis d'un champ magnétique sinusoïdal, il est connu d'accorder la self du cadre sur la fréquence de ce champ à l'aide d'une capacité. Il est également connu de placer une self en série avec le transducteur de façon à accorder ce dernier sur la fréquence du signal acoustique pour augmenter la puissance du son émis et améliorer le rendement du transducteur qui est le principal consommateur d'énergie dans un tel appareil.To obtain maximum sensitivity of the frame vis-à-vis a sinusoidal magnetic field, it is known to tune the frame self on the frequency of this field using a capacitor. It is also known to place a self in series with the transducer so as to tune the latter on the frequency of the acoustic signal to increase the power of the sound emitted and improve the efficiency of the transducer which is the main energy consumer in such a device. .

Ces améliorations s'obtiennent donc à l'aide de deux composants, une capacité et une self, qui présentent l'inconvénient, surtout la seconde, de prendre de la place et d'augmenter le prix de l'appareil. Ceci devient surtout gênant si l'on essaye de réduire l'encombrement de l'appareil jusqu'à pouvoir le mettre dans une montre électronique.These improvements are therefore obtained using two components, a capacity and a choke, which have the disadvantage, especially the second, of taking up space and increasing the price of the device. This becomes especially annoying if you try to reduce the size of the device until you can put it in an electronic watch.

L'idée d'associer un appareil de recherche de personnes avec une montre n'est pas nouvelle en soi. Par exemple, le brevet CH 533 332, ou le brevet correspondant DE 21 49 535, mentionne la possibilité d'inclure dans une montre électronique un dispositif de recherche de personnes sans toutefois en décrire une forme de réalisation. Le brevet US 3,937,004 décrit une montre pourvue d'un dispositif de recherche de personnes, fonctionnant par intermittance pour économiser le courant. Dans ce brevet US, les moyens pour capter l'onde électromagnétique extérieure et ceux nécessaires pour produire le signal sonore ne sont cependant pas décrits en détail. Il est simplement fait mention d'une antenne et d'un émetteur de son, sans préciser leur nature. Enfin, la demande CH 639 816 décrit une montre analogique dans laquelle la bobine du moteur est utilisée entre les impulsions motrices comme détecteur de champ magnétique. Il s'agit cependant de champs magnétiques parasites pouvant se manifester à différentes fréquences, rendant l'accord de la bobine sans intérêt.The idea of associating a people finder with a watch is not new in itself. For example, patent CH 533 332, or the corresponding patent DE 21 49 535, mentions the possibility of including in a electronic watch a search device for people without however describing an embodiment thereof. US Pat. No. 3,937,004 describes a watch provided with a person search device, operating intermittently to save current. In this US patent, the means for picking up the external electromagnetic wave and those necessary for producing the sound signal are however not described in detail. Mention is simply made of an antenna and a sound transmitter, without specifying their nature. Finally, application CH 639 816 describes an analog watch in which the motor coil is used between the driving pulses as a magnetic field detector. However, these are parasitic magnetic fields that can occur at different frequencies, making the tuning of the coil uninteresting.

Dans aucun des documents cités concernant des réalisations horlogères, il n'est fait mention d'un cadre accordé par une capacité et d'un transducteur piézoélectrique accordé par une self, encore moins de la possibilité d'éliminer totalement ou partiellement la capacité et la self qui présentent le désavantage, déjà cité, de prendre de la place et d'être coûteux.In none of the documents cited relating to watchmaking achievements, there is no mention of a frame tuned by a capacitance and of a piezoelectric transducer tuned by a self, let alone the possibility of totally or partially eliminating the capacitance and the self which have the disadvantage, already mentioned, of taking up space and being expensive.

La présente invention a principalement pour but d'éviter ces inconvénients en permettant de supprimer la capacité d'accord du cadre et la self d'accord du transducteur piézoélectrique sans diminuer les performances de l'appareil de recherche de personnes.The main object of the present invention is to avoid these drawbacks by eliminating the tuning capacity of the frame and the tuning inductor of the piezoelectric transducer without reducing the performance of the people search device.

Pour atteindre ce but, l'appareil selon l'invention est particulièrement remarquable en ce qu'il comprend:

  • - un cadre ayant deux bornes pour capter un signal magnétique variable;
  • - un transducteur piézoélectrique pour produire un son, ayant deux bornes entre lesquelles il présente une capacité statique;
  • - une source ayant deux bornes, fournissant un signal électrique de fréquence acoustique;
  • - des moyens pour produire un signal logique de commande en réponse au signal magnétique; et
  • - un circuit de commutation qui répond à un premier état du signal logique en court-circuitant une borne du cadre avec une borne du transducteur et l'autre borne du cadre avec l'autre borne du transducteur et à un second état du signal logique en court-circuitant une borne de la source avec une borne du cadre, l'autre borne du cadre avec une borne du transducteur et l'autre borne du transducteur avec l'autre borne de la source.
To achieve this object, the apparatus according to the invention is particularly remarkable in that it comprises:
  • - a frame having two terminals for picking up a variable magnetic signal;
  • - a piezoelectric transducer for producing a sound, having two terminals between which it has a static capacitance;
  • - a source having two terminals, providing an electrical signal of acoustic frequency;
  • - means for producing a logic control signal in response to the magnetic signal; and
  • - a switching circuit which responds to a first state of the logic signal by short-circuiting a terminal of the frame with a terminal of the transducer and the other terminal of the frame with the other terminal of the transducer and to a second state of the logic signal by short-circuiting one terminal of the source with a terminal of the frame, the other terminal of the frame with a terminal of the transducer and the other terminal of the transducer with the other terminal of the source.

D'autre caractéristiques de l'invention ressortiront de la description qui va suivre, faite en regard des dessins annexés et donnant, à titre explicatif mais nullement limitatif, une forme de réalisation d'une telle pièce d'horlogerie. Sur ces dessins, où les mêmes références désignent les mêmes éléments:

  • - la figure 1 représente un exemple de schéma bloc d'un appareil récepteur de recherche de personnes connu;
  • - la figure 2 montre une forme possible du signal codé reçu par le cadre d'un appareil de recherche et le signal logique correspondant à ce code;
  • - la figure 3 montre la forme des signaux apparaissant aux endroits principaux du schéma de la figure 1;
  • - la figure 4 représente le schéma équivalent d'un transducteur piézoélectrique connecté en série avec une self d'accord; et
  • - la figure 5 représente le schéma bloc d'une montre pourvue d'un dispositif de recherche de personnes selon l'invention.
Other characteristics of the invention will emerge from the description which follows, given with reference to the appended drawings and giving, by way of explanation but in no way limiting, an embodiment of such a timepiece. In these drawings, where the same references designate the same elements:
  • - Figure 1 shows an example of a block diagram of a known paging receiver apparatus;
  • - Figure 2 shows a possible form of the coded signal received by the frame of a research apparatus and the logic signal corresponding to this code;
  • - Figure 3 shows the shape of the signals appearing in the main places of the diagram in Figure 1;
  • - Figure 4 shows the equivalent diagram of a piezoelectric transducer connected in series with a choke choke; and
  • - Figure 5 shows the block diagram of a watch provided with a person search device according to the invention.

Une installation de recherche comprend un émetteur et une série d'appareils récepteurs portés par des personnes. L'émetteur rayonne un champ ou onde magnétique porteuse sinusoïdale, codée par exemple par une modulation d'amplitude, ayant une fréquence porteuse bien déterminée et une puissance suffisante pour atteindre les récepteurs dans un rayon donné. Tous les appareils récepteurs sont accordés sur la même fréquence porteuse, mais un appareil ne répond à l'onde émise, par exemple par un signal acoustique, que si le code de l'onde correspond au code de l'appareil, inscrit dans une mémoire. Chaque appareil répond à un code différent. Si plusieurs groupes d'appareils doivent fonctionner dans des régions voisines, à chaque groupe sera attribuée une fréquence porteuse différente.A research facility includes a transmitter and a series of receiver devices carried by people. The transmitter radiates a sine magnetic field or carrier wave, coded for example by an amplitude modulation, having a well-defined carrier frequency and sufficient power to reach the receivers within a given radius. All the receiving devices are tuned to the same carrier frequency, but a device responds to the transmitted wave, for example by an acoustic signal, only if the wave code corresponds to the device code, written in a memory. . Each device responds to a different code. If several groups of devices are to operate in neighboring regions, each group will be assigned a different carrier frequency.

Typiquement, la fréquence f de l'onde porteuse se situe entre 28 et 55 kHz, tandis que la fréquence f du signal acoustique se trouve entre 1 et 2 kHz.Typically, the frequency f of the carrier wave is between 28 and 55 kHz, while the frequency f of the acoustic signal is between 1 and 2 kHz.

La figure 1 donne le schéma de principe d'un appareil récepteur de recherche de personnes connu. Il comprend un cadre ou bobine 1, de self induction Lc, agissant comme antenne pour capter le champ magnétique. La tension induite dans le cadre par le champ peut être augmentée, de façon connue, en accordant sur la fréquence porteuse f la self Lc du cadre à l'aide d'un condensateur 2 de capacité Cc connecté à ses bornes. Cette tension, alors multipliée par le facteur de qualité Qc du cadre mesuré à la fréquence f0, est appliquée à l'entrée d'un amplificateur haute fréquence 3 très sélectif, accordé sur cette même fréquence f0 à l'aide, par exemple, d'un filtre céramique ou à quartz. La sortie de l'amplificateur 3 est reliée à l'entrée d'un démodulateur 4 qui fournit sur sa sortie un signal 4S formé d'une suite d'impulsions, correspondant à la demi- enveloppe positive de l'onde porteuse modulée. A chaque arrangement des impulsions du signal 4S correspond un code particulier.Figure 1 shows the block diagram of a receiving device known people search. It includes a frame or coil 1, of self induction L c , acting as an antenna to pick up the magnetic field. The voltage induced in the frame by the field can be increased, in a known manner, by tuning the carrier frequency f to the self L c of the frame using a capacitor 2 of capacitance C c connected to its terminals. This voltage, then multiplied by the quality factor Q c of the frame measured at the frequency f 0 , is applied to the input of a very selective high frequency amplifier 3, tuned to this same frequency f 0 using, for example example, a ceramic or quartz filter. The output of amplifier 3 is connected to the input of a demodulator 4 which provides on its output a signal 4S formed of a series of pulses, corresponding to the positive half-envelope of the modulated carrier wave. Each arrangement of the 4S signal pulses corresponds to a specific code.

Le signal 4S est appliqué à l'entrée d'un circuit décodeur 5. Celui-ci comprend une mémoire dans laquelle est inscrit le code de l'appareil et des moyens permettant de comparer ce code à celui transmis par le signal 4S. Si la comparaison montre que ces deux codes sont identiques, le signal 5S à la sortie du décodeur 5, se trouvant normalement à l'état logique bas, passe un court instant à l'état logique haut. Une bascule bistable 6 reçoit sur son entrée S de mise à l'état le signal 5S, ce qui a pour effet de mettre la sortie Q de cette bascule à l'état logique haut si la sortie du décodeur 5 se trouve dans le même état. Le signal 5S est également appliqué à l'entrée d'une bascule monostable 7 dont la sortie se trouve normalement à l'état logique bas. Cette sortie passe un bref instant à l'état logique haut t21 secondes après chaque transition du signal 5S de l'état logique bas à l'état logique haut. Le signal pris sur la sortie du monostable 7 est appliqué sur l'entrée de remise à zéro R de la bascule bistable 6 dont la sortie Q est ainsi mise à l'état logique bas après chaque impulsion de ce signal. La sortie Q de cette bascule, sur laquelle apparaît le signal 6Q, est reliée à une entrée d'une porte ET 9 à deux entrées, l'autre entrée de cette porte étant connectée à la sortie d'un générateur 8 fournissant un signal de fréquence acoustique f1. La sortie de la porte ET 9 est reliée à l'entrée d'un amplificateur de puissance 10, équivalent à une source d'énergie électrique ayant deux bornes de sortie S1 et S2. Entre ces bornes de sortie est connecté un circuit formé par la mise en série d'une self 12 d'inductance L et d'un transducteur piézoélectrique 11.The signal 4S is applied to the input of a decoder circuit 5. This includes a memory in which the code of the device is written and means making it possible to compare this code with that transmitted by the signal 4S. If the comparison shows that these two codes are identical, the signal 5S at the output of the decoder 5, normally being in the low logic state, passes for a short time to the high logic state. A bistable flip-flop 6 receives the signal 5S on its state input S, which has the effect of putting the output Q of this flip-flop in the logic high state if the output of the decoder 5 is in the same state . The signal 5S is also applied to the input of a monostable flip-flop 7 the output of which is normally in the low logic state. This output goes briefly to the high logic state t 21 seconds after each transition of the signal 5S from the low logic state to the high logic state. The signal taken from the output of the monostable 7 is applied to the reset input R of the flip-flop 6, the output Q of which is thus brought to the low logic state after each pulse of this signal. The output Q of this flip-flop, on which the signal 6Q appears, is connected to an input of an AND gate 9 with two inputs, the other input of this gate being connected to the output of a generator 8 providing a signal of acoustic frequency f 1 . The output of the AND gate 9 is connected to the input of a power amplifier 10, equivalent to a source of electrical energy having two output terminals S 1 and S 2 . Between these output terminals is connected a circuit formed by the series connection of an inductor 12 with inductance L and a piezoelectric transducer 11.

Le fonctionnement du circuit de la figure 1 sera maintenant expliqué à l'aide des signaux représentés sur les figures 2 et 3.The operation of the circuit in FIG. 1 will now be explained using the signals shown in FIGS. 2 and 3.

Un exemple de champ magnétique codé émis par l'émetteur de l'installation de recherche de personnes est représenté en fonction du temps par l'onde E sur la figure 2. Il comprend une onde porteuse modulée en amplitude par tout ou rien, formant une suite d'émissions de durées égales, distribuées dans le temps conformément à une règle qui définit les différents codes du système de codage.An example of a coded magnetic field emitted by the transmitter of the paging system is represented as a function of time by the E wave in FIG. 2. It comprises a carrier wave modulated in amplitude by all or nothing, forming a series of programs of equal duration, distributed over time in accordance with a rule which defines the different codes of the coding system.

Le champ magnétique émis par l'émetteur induit dans le cadre 1 de la figure 1 une tension de même forme que l'onde E. Si le cadre 1 est accordé par le condensateur 2, la tension obtenue est de l'ordre de quelques dizaines de microvolts. Après amplification et démodulation par les ciruits 3 et 4, la tension induite dans le cadre 1 prend la forme du signal 4S représenté sur la figure 2. Le même signal est également montré sur la figure 3 sur une durée plus grande. Il se compose d'une suite de trains d'impulsions, chaque train définissant le code transmis. Le premier train d'impulsions débute à un instant T0 pour se terminer à un instant T1. De même le deuxième train débute à un instant T0' pour se terminer à un instant T1'. Enfin, le troisième train d'impulsions représenté débute et se termine respectivement aux instant To" et T1". La durée T1 - T0, T1' - T0' de chaque train d'impulsions est constante, ainsi que la durée T ' - T , T0" - T0' séparant deux trains consécutifs. Les trains d'impulsions se succèdent ainsi jusqu'à ce que la personne recherchée ait répondu ou que l'émission cesse après un temps prédéterminé.The magnetic field emitted by the emitter induces in frame 1 of FIG. 1 a voltage of the same shape as the E wave. If the frame 1 is tuned by the capacitor 2, the voltage obtained is of the order of a few tens of microvolts. After amplification and demodulation by circuits 3 and 4, the voltage induced in frame 1 takes the form of the signal 4S shown in FIG. 2. The same signal is also shown in FIG. 3 over a longer period. It consists of a series of pulse trains, each train defining the transmitted code. The first pulse train begins at an instant T 0 and ends at an instant T 1 . Likewise, the second train begins at an instant T 0 'and ends at an instant T 1 '. Finally, the third train of pulses shown begins and ends respectively at time T o "and T 1 ". The duration T 1 - T 0 , T 1 '- T 0 ' of each pulse train is constant, as well as the duration T '- T, T 0 "- T 0 ' separating two consecutive trains. The pulse trains follow one another until the person sought has replied or the broadcast stops after a predetermined time.

Si le code du train d'impulsions débutant à l'instant T0 et se terminant à l'instant T1 correspond à celui mémorisé dans le décodeur 5, ce circuit délivrera une brève impulsion à un instant qui suit immédiatement l'instant T1, comme l'indique le signal 5S représenté sur la figure 3. Cette impulsion, appliquée simultanément sur les entrées des bascules 6 et 7, mettra la sortie Q de la première à l'état logique haut, ainsi que le montre le signal 6Q, et la sortie de la seconde à l'état logique bas. La porte ET 9, recevant sur une entrée le signal 6Q, laissera passer le signal produit par le générateur 8, appliqué sur l'autre entrée, jusqu'à l'entrée de l'amplificateur 10.If the code of the pulse train starting at time T 0 and ending at time T 1 corresponds to that stored in the decoder 5, this circuit will deliver a short pulse at a time which immediately follows time T 1 , as indicated by the signal 5S represented in FIG. 3. This pulse, applied simultaneously to the inputs of flip-flops 6 and 7, will put the output Q of the first in the high logic state, as shown by the signal 6Q, and the output of the second in the low logic state. Gate ET 9, receiving on a input signal 6Q, will pass the signal produced by generator 8, applied to the other input, to the input of amplifier 10.

Le transducteur piézoélectrique 11, excité à travers la self 12 par l'amplificateur 10, produit alors un signal acoustique à partir de l'instant T1. Ce signal durera t21 secondes, jusqu'à un instant T2, temps nécessaire à la sortie de la bascule monostable 7 pour passer un bref instant de l'état logique bas à l'état logique haut afin de remettre à l'état logique bas la sortie Q de la bascule bistable 6. Une entrée de la porte ET 9 étant dès l'instant T2 à l'état logique bas, le signal du générateur acoustique 8 est bloqué et ne peut plus exciter le transducteur 11.The piezoelectric transducer 11, excited through the inductor 12 by the amplifier 10, then produces an acoustic signal from time T 1 . This signal will last t 21 seconds, up to an instant T 2 , time necessary for the output of the monostable flip-flop 7 to pass a brief instant from the low logic state to the high logic state in order to return to the logic state. down the output Q of the flip-flop 6. An input of the AND gate 9 being from the moment T 2 in the low logic state, the signal from the acoustic generator 8 is blocked and can no longer excite the transducer 11.

Le signal acoustique cesse définitivement à l'instant T2 si la personne appelée fait le nécessaire avant cet instant, par exemple en composant un numéro de téléphone, pour arrêter l'émission. Sinon, un deuxième train d'impulsions, identique au premier, est émis à partir de l'instant T0', déclenchant, à l'instant T1', un deuxième appel acoustique qui dure jusqu'à un instant T2'.The acoustic signal definitively ceases at time T 2 if the person called takes the necessary steps before this time, for example by dialing a telephone number, to stop the transmission. Otherwise, a second pulse train, identical to the first, is sent from time T 0 ', triggering, at time T 1 ', a second acoustic call which lasts until time T 2 '.

Le circuit de la figure 4, ayant deux bornes A et B, montre le schéma équivalent du transducteur piézoélectrique 11 et la self d'accord 12 de valeur Lo, connectés en série. Ce schéma comprend une capacité statique C0 aux bornes de laquelle est connectée une branche motionnelle composée d'une self L1, d'une résistance R1 et d'une capacité C1. La capacité statique C0 est égale à la capacité existant entre les électrodes du transducteur, tandis que les propriétés vibratoires du transducteur sont représentées par les paramètres L1, R1, C1 de la branche motionnelle.The circuit of FIG. 4, having two terminals A and B, shows the equivalent diagram of the piezoelectric transducer 11 and the chord inductor 12 of value L o , connected in series. This diagram includes a static capacitance C 0 at the terminals of which is connected a motional branch composed of a self L 1 , of a resistance R 1 and of a capacitance C 1 . The static capacitance C 0 is equal to the capacitance existing between the electrodes of the transducer, while the vibratory properties of the transducer are represented by the parameters L 1 , R 1 , C 1 of the motional branch.

La capacité mationnelle C1 est environ 1000 fois plus faible que la capacité statique C0 dont la valeur peut varier, suivant la forme des métallisations, entre 1 nF et 50 nF dans un transducteur de montre. Le cadre 1, de son côté, réalisé dans les dimensions horlogères, peut typiquement être de forme circulaire, avoir un diamètre de l'ordre de 25 mm et contenir un millier de spires d'un fil d'environ 50 micromètres de diamètre. La self L d'un tel cadre se situe alors entre 10 mH et 50 mH.The operational capacity C 1 is approximately 1000 times lower than the static capacity C 0 , the value of which can vary, depending on the form of the metallizations, between 1 nF and 50 nF in a watch transducer. The frame 1, for its part, produced in horological dimensions, can typically be circular in shape, have a diameter of the order of 25 mm and contain a thousand turns of a wire of around 50 micrometers in diameter. The self L of such a frame is then between 10 mH and 50 mH.

La capacité C0 peut ainsi très bien convenir pour accorder la self Lc du cadre. En effet, avec les valeurs limites que peuvent prendre ces deux composants, il est possible de couvrir un domaine de fréquences allant de 3 kHz à 50 kHz, contenant celui utilisé dans les installations de recherche de personnes. Un des buts de la présente invention étant de supprimer le condensateur d'accord 2 du cadre, on voit qu'il peut être atteint en utilisant la capacité C0 du transducteur 11 pour cette fonction.The capacitance C 0 can thus very well be suitable for granting the self L c of the frame. Indeed, with the limit values that can taking these two components, it is possible to cover a frequency range from 3 kHz to 50 kHz, containing that used in paging installations. One of the aims of the present invention being to remove the tuning capacitor 2 from the frame, it can be seen that it can be achieved by using the capacitance C 0 of the transducer 11 for this function.

On examinera maintenant le fonctionnement du transducteur 11 en émetteur acoustique. Il est bien connu que le son émis sera d'autant plus fort que le courant traversant la branche motionnelle L1, R1, C1, représentée sur la figure 4, est élevé. Pour réaliser au mieux cette condition, il faut que la tension aux bornes de la capacité C0 soit aussi élevée que possible et que la fréquence du courant corresponde à la fréquence de résonance f1 = (2 π)-1 (L1C1)-1/2 de la branche motionnelle. Si V est la tension alternative de fréquence f1, fournie par l'amplificateur 10 aux bornes A, B du circuit de la figure 4, si la branche motionnelle est supposée ouverte et si la valeur L0 de la self 12 est telle que LoCo = L1C1, la tension aux bornes de la capacité C0 sera égale à QoV, Q0 étant le facteur de qualité de la self 12 à la fréquence f1. Aux fréquences acoustiques, la valeur de Q0 peut varier entre 3 et 10. La tension aux bornes de la capacité Co, même chargée par la branche motionnelle dont l'impédance est élevée par rapport à celle de Co, restera donc nettement supérieure à V.We will now examine the operation of the transducer 11 as an acoustic transmitter. It is well known that the sound emitted will be all the stronger as the current passing through the motional branch L 1 , R 1 , C 1 , shown in FIG. 4, is high. To best achieve this condition, the voltage across the capacitance C 0 must be as high as possible and the frequency of the current corresponds to the resonant frequency f 1 = (2 π) -1 (L 1 C 1 ) -1/2 of the emotional branch. If V is the alternating voltage of frequency f 1 , supplied by the amplifier 10 at the terminals A, B of the circuit of FIG. 4, if the motional branch is assumed to be open and if the value L 0 of the choke 12 is such that L o C o = L 1 C 1 , the voltage across the capacitor C 0 will be equal to Q o V, Q 0 being the quality factor of the inductor 12 at the frequency f 1 . At acoustic frequencies, the value of Q 0 can vary between 3 and 10. The voltage across the capacitance C o , even charged by the motional branch whose impedance is high compared to that of C o , will therefore remain significantly higher to V.

Afin d'éviter un composant encombrant et coûteux, conformément à un autre but de la présente invention, la self 12 peut être remplacée par le cadre 1. Cependant si la self L du cadre 1 et la capacité C0 du transducteur 11 sont accordées sur la fréquence f0 de l'onde porteuse, l'efficacité du cadre à la fréquence acoustique f1, inférieure d'environ vingt fois à f , ne saurait être bonne tout en apportant une certaine amélioration par rapport à une attaque directe du transducteur 11 par l'amplificateur 10.In order to avoid a bulky and expensive component, in accordance with another object of the present invention, the choke 12 can be replaced by the frame 1. However if the choke L of the frame 1 and the capacitance C 0 of the transducer 11 are granted on the frequency f 0 of the carrier wave, the efficiency of the frame at the acoustic frequency f 1 , which is about twenty times lower than f, cannot be good while bringing some improvement compared to a direct attack on the transducer 11 by amplifier 10.

Pour accorder la self L sur la fréquence f1, un condensateur additionnel 13 de capacité C ' peut être connecté en parallèle sur C0, comme cela est montré sur la figure 4. L'accord sera réalisé si la valeur de C0' satisfait à la relation (C ' + C ) Lc = L1C1. L'utilisation d'un tel condensateur aux bornes du transducteur 11 représente une complication qui est toutefois largement compensée par la possibilité de supprimer le condensateur 2 et la self 12 du schéma de la figure 1. Le condensateur additionnel 13 peut être un second transducteur piézoélectrique présentant une capacité statique Co'. Il est possible de réaliser les deux transducteurs sous forme d'un seul élément présentant deux faces et ayant une électrode commune sur une face et deux électrodes sur l'autre face, chacune de ces dernières électrodes définissant un des transducteurs.To tune the self L on the frequency f 1 , an additional capacitor 13 of capacitance C 'can be connected in parallel on C 0 , as shown in FIG. 4. The tuning will be carried out if the value of C 0 ' satisfies to the relation (C '+ C) L c = L 1 C 1 . The use of such a capacitor at the terminals of the transducer 11 represents a complication which is however largely compensated by the possibility of eliminating the capacitor 2 and the inductor 12 from the diagram in FIG. 1. The additional capacitor 13 can be a second piezoelectric transducer having a static capacitance C o '. It is possible to produce the two transducers in the form of a single element having two faces and having a common electrode on one face and two electrodes on the other face, each of these latter electrodes defining one of the transducers.

L'utilisation du cadre 1 soit comme capteur d'ondes magnétiques, soit comme self d'accord du transducteur 11 et l'utilisation de ce transducteur soit comme émetteur acoustique, soit comme condensateur d'accord du cadre 1, n'est possible que s'il est fait usage d'un circuit de commutation permettant de connecter le cadre et le transducteur de façon adéquate pour remplir ces différentes fonctions.The use of frame 1 either as a magnetic wave sensor or as a chord inductor of the transducer 11 and the use of this transducer either as an acoustic emitter or as a chord capacitor of frame 1 is only possible if a switching circuit is used to connect the frame and the transducer adequately to fulfill these various functions.

La figure 5 représente le schéma bloc d'une montre, par exemple digitale, pourvue d'un circuit de recherche de personnes selon l'invention. La partie montre, de conception classique, comprend un quartz 20 servant de base de temps, un circuit d'entretien 21, un compteur 22, un circuit d'attaque 24 et un affichage digital 25. Le quartz 20 est relié au circuit d'entretien 21, l'ensemble formant un oscillateur. Le signal à la sortie du circuit d'entretien est appliqué à l'entrée du compteur 22 qui a une sortie principale SI et deux sorties auxiliaires S2 et S3* Sur ces deux dernières sorties apparaissent respectivement un signal haute fréquence formé d'impulsions et un signal de fréquence acoustique. La sortie SI fournit, de son côté, un signal contenant l'information horaire. Il est appliqué à l'entrée du circuit d'attaque 24 qui élabore les signaux nécessaires à l'indication de l'heure par l'affichage 25 auquel il est relié.FIG. 5 represents the block diagram of a watch, for example digital, provided with a people search circuit according to the invention. The watch part, of conventional design, comprises a quartz 20 serving as a time base, a maintenance circuit 21, a counter 22, a driving circuit 24 and a digital display 25. The quartz 20 is connected to the maintenance 21, the assembly forming an oscillator. The signal at the output of the maintenance circuit is applied to the input of the counter 22 which has a main output SI and two auxiliary outputs S 2 and S 3 * On these last two outputs appear a high frequency signal formed by pulses and an acoustic frequency signal. The output SI provides, for its part, a signal containing the time information. It is applied to the input of the driving circuit 24 which generates the signals necessary for indicating the time by the display 25 to which it is connected.

La partie recherche de personnes de la figure 5 comprend les éléments 1, 3, 4, 5, 6, 9 et 10, déjà décrits à propos de la figure 1 et connectés de la même façon dans les deux figures. La bascule monostable 7 de la figure 1 a été remplacée, dans la figure 5, par un compteur 23 de réalisation plus simple. Ce compteur 23 reçoit, sur une entrée, les impulsions provenant de la sortie S2 du compteur 22 de la montre et, sur une autre entrée, le signal 5S. Chaque impulsion du signal 5S remet à zéro le compteur 23 puis déclenche le comptage. Une fois le compteur 23 rempli, il produit une impulsion sur sa sortie, laquelle est reliée à l'entrée R de la bascule bistable 6. Le temps nécessaire à remplir ce compteur correspond à l'intervalle de temps t21, précédemment déterminé par la bascule monostable 7. L'entrée de la porte ET 9 qui était reliée dans la figure 1 à la sortie du générateur de fréquence acoustique 8, est connectée dans le circuit de la figure 5 à la sortie S3 du compteur 22 qui fournit un signal de même fréquence.The people search part of figure 5 includes elements 1, 3, 4, 5, 6, 9 and 10, already described in connection with figure 1 and connected in the same way in the two figures. The monostable lever 7 of FIG. 1 has been replaced, in FIG. 5, by a counter 23 of simpler construction. This counter 23 receives, on one input, the pulses coming from the output S 2 of the counter 22 of the watch and, on another input, the signal 5S. Each pulse of signal 5S resets counter 23 to zero then triggers the counting. Once the counter 23 is filled, it produces a pulse on its output, which is connected to the input R of the flip-flop 6. The time required to fill this counter corresponds to the time interval t 21 , previously determined by the monostable rocker 7. The input of the AND gate 9 which was connected in FIG. 1 to the output of the acoustic frequency generator 8, is connected in the circuit of FIG. 5 to the output S 3 of the counter 22 which supplies a signal of the same frequency.

Le circuit de commutation du cadre 1 et du transducteur 11 déjà mentionné, est représenté par le bloc 15 sur la figure 5. Ce circuit a trois entrées E1, E2, E3 et trois sorties S1, S2, S3. Les entrées E1 et E2 sont respectivement reliées aux sorties S1 et S2 de l'amplificateur 10. L'entrée E3 reçoit le signal 6Q provenant de la sortie de la bascule bistable 6. La sortie S1 du circuit 15 est reliée à une borne du cadre 1. La sortie S2 de ce même circuit est connectée à une borne d'un condensateur 14 ayant une capacité égale à la capacité Co' du condensateur 13 de la figure 4. L'autre borne de ce condensateur est reliée à une borne du transducteur 11 et à l'autre borne du cadre 1. Le cadre 1, le transducteur 11 et le condensateur 14 ont ainsi une borne commune. Enfin, la sortie S3, l'entrée E1 et l'autre borne du transducteur sont reliées ensemble.The circuit for switching the frame 1 and the transducer 11 already mentioned, is represented by block 15 in FIG. 5. This circuit has three inputs E 1 , E 2 , E 3 and three outputs S 1 , S 2 , S 3 . The inputs E1 and E 2 are respectively connected to the outputs S 1 and S 2 of the amplifier 10. The input E 3 receives the signal 6Q coming from the output of the flip-flop 6. The output S 1 of the circuit 15 is connected to a terminal of frame 1. The output S 2 of this same circuit is connected to a terminal of a capacitor 14 having a capacity equal to the capacity C o 'of the capacitor 13 of FIG. 4. The other terminal of this capacitor is connected to one terminal of the transducer 11 and to the other terminal of the frame 1. The frame 1, the transducer 11 and the capacitor 14 thus have a common terminal. Finally, the output S 3 , the input E 1 and the other terminal of the transducer are connected together.

Le circuit 15 comprend essentiellement deux commutateurs A et B actionnés par des relais non représentés. Le premier commutateur est relié à la sortie S1 et le second à la sortie S2. Le commutateur A peut occuper deux positions a1 et a2. Dans la position al, le commutateur ferme un contact qui met en liaison la sortie S1 avec l'entrée E1. Dans la position a2, cette sortie est reliée à l'entrée E2. Le commutateur B peut également occuper deux positions b1 et b2. Dans la position b1, le commutateur ne ferme aucun contact et la sortie S2 reste flottante, tandis que dans la position b2, cette sortie est connectée à l'entrée E1.The circuit 15 essentially comprises two switches A and B actuated by relays not shown. The first switch is connected to the output S 1 and the second to the output S 2 . The switch A can occupy two positions at 1 and at 2 . In position a l , the switch closes a contact which links the output S 1 with the input E 1 . In position a2, this output is connected to input E 2 . Switch B can also occupy two positions b 1 and b 2 . In position b 1 , the switch does not close any contact and the output S 2 remains floating, while in position b 2 , this output is connected to input E 1 .

Les relais non représentés actionnant les commutateurs A et B sont commandés par le signal 6Q montré sur la figure 3. Ce signal est appliqué sur l'entrée E3 du circuit 15. On supposera qu'à un état logique bas du signal 6Q correspondent les positions a1 et b1 des commutateurs A et B et qu'à un état logique haut de ce signal correspondent les positions a2 et b2 de ces mêmes commutateurs.The relays, not shown, actuating the switches A and B are controlled by the signal 6Q shown in FIG. 3. This signal is applied to the input E 3 of the circuit 15. It will be assumed that at a low logic state of the signal 6Q correspond the positions a 1 and b 1 of switches A and B and that at a high logic state of this signal correspond the positions a 2 and b 2 of these same switches.

Le fonctionnement de la partie recherche de personnes du circuit de la figure 5 est le suivant. En l'absence de tout signal de recherche codé E, les signaux 4S, 5S, et 6Q des figures 2 et 3 restent tous à l'état logique bas. Cela a pour effet de mettre les commutateurs A et B respectivement dans les positions a1 et b1. Les deux bornes du transducteur 11 se trouvent alors reliées aux deux bornes du cadre 1 et une borne du condensateur 14 est rendue flottante. Le cadre se trouve accordé, dans ces conditions, par la capacité statique du transducteur sur la fréquence porteuse f0 du signal E, rendant inutile le condensateur d'accord 2 représenté sur la figure 1.The operation of the people search part of the circuit of FIG. 5 is as follows. In the absence of any coded search signal E, the signals 4S, 5S, and 6Q of FIGS. 2 and 3 all remain in the low logic state. This has the effect of putting the switches A and B respectively in the positions a 1 and b 1 . The two terminals of the transducer 11 are then connected to the two terminals of the frame 1 and one terminal of the capacitor 14 is made floating. The frame is tuned, under these conditions, by the static capacitance of the transducer on the carrier frequency f 0 of the signal E, making unnecessary the tuning capacitor 2 shown in FIG. 1.

Le circuit 15 reste dans cet état jusqu'à ce qu'un signal codé reçu par le cadre 1 soit reconnu par le décodeur 5. La sortie Q de la bascule 6 passe alors à l'état logique haut à l'instant Tl entraînant le basculement des commutateurs A et B respectivement dans les positions a2 et b2. Les sorties S1 et S2 de l'amplificateur 10, qui agit comme une source produisant un signal de fréquence acoustique, sont alors reliées, par le commutateur A, aux bornes du transducteur 11 à travers le cadre 1, rendant inutile la self 12 de la figure 1. Le condensateur 14 de capacité C0' est connecté, de son côté, directement aux bornes du transducteur par le commutateur B. Dans ces conditions, le transducteur étant excité par l'amplificateur 10, il émettra un signal acoustique d'appel dans les meilleures conditions de rendement. Ce signal d'appel sera émis pendant t21 secondes. Ensuite, à l'instant T2, la sortie Q de la bascule 6 passant à l'état logique bas, le transducteur 11 sera de nouveau connecté aux bornes du cadre 1, comme au début du cycle. Si le signal d'appel est resté sans réponse, un nouveau cycle, identique au précédent, sera déclenché à partir de l'instant T0'.The circuit 15 remains in this state until a coded signal received by the frame 1 is recognized by the decoder 5. The output Q of the flip-flop 6 then goes to the high logic state at the instant T l causing the switching of switches A and B respectively in positions a 2 and b 2 . The outputs S 1 and S 2 of the amplifier 10, which acts as a source producing an acoustic frequency signal, are then connected, by the switch A, to the terminals of the transducer 11 through the frame 1, making the choke 12 unnecessary. of FIG. 1. The capacitor 14 of capacity C 0 'is connected, for its part, directly to the terminals of the transducer by the switch B. Under these conditions, the transducer being excited by the amplifier 10, it will emit an acoustic signal d 'call in the best performance conditions. This call signal will be transmitted for t 21 seconds. Then, at the instant T 2 , the output Q of the flip-flop 6 passing to the low logic state, the transducer 11 will again be connected to the terminals of the frame 1, as at the start of the cycle. If the call signal has remained unanswered, a new cycle, identical to the previous one, will be triggered from time T 0 '.

La présente invention ne se limite pas au seul mode de réalisation d'un dispositif de recherche de personnes qui vient d'être décrit, mais la portée du présent brevet s'étend également aux variantes des divers circuits restant dans le cadre des équivalences. Par exemple, le fonctionnement du circuit 15 de la figure 5 a été décrit à l'aide de contacts pour faciliter la compréhension. Bien entendu, sans sortir du cadre de l'invention, les contacts peuvent être remplacés de façon connue par des dispositifs électroniques de commutation tels que des transistors et des portes de transmission.The present invention is not limited to the single embodiment of a person search device which has just been described, but the scope of this patent also extends to the variants of the various circuits remaining within the framework of equivalences. For example, the operation of the circuit 15 in FIG. 5 has been described using contacts to facilitate understanding. Of course, without departing from the scope of the invention, the contacts can be replaced in a known manner by electronic switching devices such as transistors and transmission gates.

Claims (4)

1. Appareil de recherche de personnes caractérisé en ce qu'il comprend : - un cadre (1) présentant une self et ayant deux bornes pour capter un signal magnétique variable; - un transducteur piézoélectrique (11) capable de produire un son, ledit transducteur ayant deux bornes entre lesquelles il présente une capacité statique; - une source (10), ayant deux bornes (51, 52), fournissant un signal électrique de fréquence acoustique; - des moyens (5, 6, 22, 23) pour produire un signal logique de commande (6Q) en réponse audit signal magnétique; et - un circuit de commutation (15) qui répond à un premier état dudit signal logique en connectant ledit cadre et ledit tansduc- teur en parallèle, et qui répond au deuxième état dudit signal logique en connectant ledit cadre et ledit transducteur en série et aux bornes de ladite source. 1. People search device characterized in that it comprises: - a frame (1) having a choke and having two terminals for picking up a variable magnetic signal; - a piezoelectric transducer (11) capable of producing a sound, said transducer having two terminals between which it has a static capacitance; - a source (10), having two terminals (51, 52), providing an electrical signal of acoustic frequency; - means (5, 6, 22, 23) for producing a logic control signal (6Q) in response to said magnetic signal; and - a switching circuit (15) which responds to a first state of said logic signal by connecting said frame and said transformer in parallel, and which responds to the second state of said logic signal by connecting said frame and said transducer in series and at the terminals from said source. 2. Appareil selon la revendication 1, caractérisé en ce que la self dudit cadre est accordée par la capacité statique dudit transducteur sur la fréquence dudit signal magnétique.2. Apparatus according to claim 1, characterized in that the inductance of said frame is granted by the static capacity of said transducer on the frequency of said magnetic signal. 3. Appareil selon l'une des revendications 1 et 2, caractérisé en ce qu'il comporte, en plus, un condensateur additionnel (14), lequel est connecté aux bornes dudit transducteur par ledit circuit de commutation lorsque ledit signal logique de commande se trouve dans ledit deuxième état.3. Apparatus according to one of claims 1 and 2, characterized in that it comprises, in addition, an additional capacitor (14), which is connected to the terminals of said transducer by said switching circuit when said logic control signal is found in said second state. 4. Appareil selon la revendication 3, caractérisé en ce que la self dudit cadre est accordée par ladite capacité statique augmentée de la capacité dudit condensateur additionnel sur ladite fréquence acoustique.4. Apparatus according to claim 3, characterized in that the inductance of said frame is granted by said static capacity increased by the capacity of said additional capacitor on said acoustic frequency.
EP85104910A 1984-04-25 1985-04-23 Apparatus for locating persons for an electronic timepiece Expired EP0161545B1 (en)

Applications Claiming Priority (2)

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CH2030/84 1984-04-25
CH203084A CH654169GA3 (en) 1984-04-25 1984-04-25

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EP0161545B1 EP0161545B1 (en) 1988-08-10

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EP (1) EP0161545B1 (en)
JP (1) JPS60235541A (en)
CH (1) CH654169GA3 (en)
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SG (1) SG64391G (en)

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GB2201266A (en) * 1986-12-23 1988-08-24 Upperpace Limited A radio paging watch
US5012235A (en) * 1987-10-20 1991-04-30 Telefind Corporation Paging receiver with continuously tunable antenna and RF amplifier
US5052049A (en) * 1987-10-20 1991-09-24 Telefind Corporation Paging receiver with continuously tunable antenna

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US5572488A (en) * 1993-12-17 1996-11-05 Seiko Communications Holding N.V. Wristwatch paging receiver having analog message display
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263064A1 (en) * 1986-09-17 1988-04-06 Datamars Sa Electronic identification device, in particular for a clock
GB2201266A (en) * 1986-12-23 1988-08-24 Upperpace Limited A radio paging watch
US5012235A (en) * 1987-10-20 1991-04-30 Telefind Corporation Paging receiver with continuously tunable antenna and RF amplifier
US5052049A (en) * 1987-10-20 1991-09-24 Telefind Corporation Paging receiver with continuously tunable antenna

Also Published As

Publication number Publication date
EP0161545B1 (en) 1988-08-10
CH654169GA3 (en) 1986-02-14
SG64391G (en) 1991-09-13
DE3564353D1 (en) 1988-09-15
JPH039659B2 (en) 1991-02-08
US4663624A (en) 1987-05-05
JPS60235541A (en) 1985-11-22

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