CN2246359Y - Non-counter-polar full automatic telephone fee counter - Google Patents

Abstract

The utility model discloses a non-reverse-polarity full automatic telephone fee counter, which belongs to the technical field of post and telecommunication. The utility model can realize full automatic timing and fee counting when common telephones which are in great majority can not get a reverse-polarity signal or other called off-hook signals. The utility model is characterized in that a signal tone recognition circuit (5) and a voice recognition circuit (6) are additionally arranged on a known singlechip control telephone fee counter. The non-reverse-polarity full automatic telephone fee counter can be used on any occasion which needs telephone fee counting, such as a public telephone, an office telephone, etc.

Description

No antipole automatic telephone taximeter

The utility model belongs to the post and telecommunications technical field, particularly a kind of no antipole automatic telephone taximeter.Known telephone charge counter product has multiple, and its purposes is to be connected between subscribers feeder and the telephone set, and the phone that the telephone subscriber got is carried out Fare determined by travel time.Known telephone charge counter generally all is made up of peripheral circuit and Fare determined by travel time unit two major parts, adopt a single-chip microprocessor system as the Fare determined by travel time unit, the effect of peripheral circuit is the monitoring user line states and obtains subscriber line signal, and by it being handled and computing the Fare determined by travel time unit, finish the Fare determined by travel time process, and the Fare determined by travel time result is delivered to display circuit show that externally wherein peripheral circuit important function is to obtain the initial signal of Fare determined by travel time.

Can the initial moment of standard that Telephone Time-Count charges be to count during from called off-hook, how to judge called off-hook exactly, for present telephone charge counter, be the key that realize full-automatic Fare determined by travel time.At present, the initial moment of Fare determined by travel time of telephone charge counter define following three kinds of approach:

1) provides called off hook signal (generally being anti-polar signal) by switch, as the Fare determined by travel time initial signal, to realize full-automatic Fare determined by travel time.

This way application surface is very narrow.Because for accounting for most ordinary telephone subscriber lines, switch does not provide called off hook signal for it, generally only just can obtain sort signal on the subscribers feeder of public telephone or public business phone.

2) dialled the other side's telephone number from caller, wait for an official hour (as 20 seconds) after, automatically it is forced Fare determined by travel time.Though this taximeter can be realized the automatic charging of ordinary telephone subscriber line, can only be referred to as the semi-automatic telephone taximeter, because the poor accuracy of its Fare determined by travel time, even can occur not getting through and mistake is chargeed and got through phone and the situation of not chargeing.

3) artificially judge called off-hook, press hand push button, charging picks up counting.

This way is manually to carry out fully, and poor accuracy needs staff on duty.

The purpose of this utility model just is to invent a kind of " not needing switch that called off hook signal (generally being anti-polar signal) is provided; just can realize the telephone charge counter of full-automatic Fare determined by travel time accurately ", can be used for the no antipole automatic telephone taximeter of general link circuit that is:.

The utility model proposes such technical solution that can be used for the no antipole automatic telephone taximeter of general link circuit: it has shell and is positioned at the circuit board of shell, on circuit board, has power circuit 1., general peripheral interface circuit 2., the Fare determined by travel time unit 3., display circuit 4., its special character is: installed additional the signal tone identification circuit 5. with voice recognition circuit 6., be respectively applied for the signal tone and the voice signal that whether exist on the monitoring telephone loop with the ring-back tone same frequency, and monitoring result delivered to Fare determined by travel time unit single-chip microcomputer SCM 3., single-chip microcomputer SCM solidifies ring-back tone/speech analysis software in EPROM or ROM by operation, can automatically identify called off-hook, thereby reach the purpose of full-automatic Fare determined by travel time.

The front of described shell has digital displaying window , and has indicator light and button ; The shell rear board 10. locate to draw the AC220V power line, telephone loop is then drawn by the binding post on the rear board (11) with the connecting line that is connected phone.

Described general peripheral interface circuit is 2. by broken string control circuit (a), hook state/pulse dialing testing circuit (b), and DTMF DTMF pulsing decoding circuit (c), button inputting circuits (d), sound equipment output circuit (e) is formed; 3. the Fare determined by travel time unit is by single chip microcomputer SCM, and octal latch LK, program storage EPROM or ROM and data storage RAM and electric erasable memory EEPROM form; Display circuit 4. by show charactron, indication is with light-emitting diode and latch drive circuit and form; 5. the signal tone identification circuit is made up of band pass filter (f) and single audio frequency decoding circuit (g); 6. voice recognition circuit is made up of band stop filter (h) and background noise discriminator circuit (i), and the band pass filter (f) of signal tone identification circuit in 5. is provided with for further improving interference free performance, generally speaking can.

The main annexation of foregoing circuit is: general peripheral interface circuit 2. in, the control end of broken string control circuit (a) is controlled by the I/O mouth line of single-chip microcomputer SCM, and 8. its input is connected in telephone loop, its output is connected to the input of hook state/dial impulse testing circuit (b), be connected to DTMF dual-tone multifrequency decoding circuit (C) simultaneously, this output also is connected to signal tone identification circuit input and speech recognition circuit input 6. 5. as a general peripheral interface circuit output 2. simultaneously.7. the phone link of hook state/dial impulse testing circuit (b) is connected to phone, and its testing result output is connected to an I/O mouth line of single-chip microcomputer, the output of DTMF decoding circuit (c) is connected to the I/O mouth line of single-chip microcomputer SCM.From the above: 5. the signal tone identification circuit all is connected from a general peripheral interface circuit output 2. with voice recognition circuit input 6., and it is 2. inner at peripheral interface circuit, 8. this output links to each other with telephone loop indirectly by a broken string control circuit (a), has all signals of telecommunication that 8. telephone loop is gone up on this output.

Entering signal sound identification circuit input 5. is to link to each other with the input of band pass filter (f), the output of band pass filter (f) is connected to the input of single audio frequency decoding circuit (g), the output of single audio frequency decoding circuit (g) is signal tone identification circuit output 5. just, is connected on the I/O mouth line L1 of single-chip microcomputer SCM.

Entering voice recognition circuit input 6. is to link to each other with the input of band stop filter (h), the output of band stop filter (h) is connected to the input of background noise discriminator circuit (i), the output of background noise discriminator circuit is voice recognition circuit output 6. just, is connected on the I/O mouth line L2 of single-chip microcomputer SCM.

In background noise discriminator circuit (i), at first by a current rectifying and wave filtering circuit, the signal of input is become direct current signal, again this signal is delivered to an input of a voltage comparator, and another input of this comparator is coupled with a background noise reference voltage, the output of this voltage comparator is the output of background noise discriminator circuit (i), also is voice recognition circuit output 6..

The operation principle of the technical program is: 1. power circuit provides working power for this operating circuit.When by Charging telephone 7. behind the off-hook, the electric current that 8. subscribers feeder is gone up just has a very big increase, when circuit (b) detects this variation, promptly 3. sends a certain definite level signal by photoelectrical coupler to the Fare determined by travel time unit.In like manner, if 7. telephone set sends pulse signal, the electric current that 8. subscribers feeder is gone up just changes synchronously with this pulse signal.And circuit (b) is when detecting this variation, to send and its level signal that changes synchronously, 3. this signal receives and is identified as dialed number by the Fare determined by travel time unit, DTMF dual-tone multifrequency decoding circuit (c) is responsible for that then the DTMF pulsing signal that 7. telephone set sends is translated into binary-coded decimal and is delivered to the Fare determined by travel time unit 3., after dialing finishes, 8. subscribers feeder goes up signal tones such as ring-back tone, busy tone might occur, speech and diversity of settings noise also might occur.The band pass filter (f) of signal tone identification circuit in 5. is provided with for improving interference free performance, generally speaking can, it only allows to pass through with the signal tone (comprising ring-back tone) of ring-back tone same frequency, and deliver to single audio frequency decoding circuit (g), the centre frequency of this decoding circuit is set as the ring-back tone frequency of standard, its output will indicate the state that has or not with the signal tone of ring-back tone same frequency, and 3. this state is delivered to the Fare determined by travel time unit.The band stop filter (h) of voice recognition circuit in 6. stopped ring-back tone and with the audio signal of ring-back tone same frequency, only allow the outer speech of band and other diversity of settings noises to pass through, and then deliver to background noise and differentiate phone (i), the effect of background noise discriminator circuit (i) is input signal to be carried out noise differentiate, at first the input signal rectifying and wave-filtering is become direct current signal, again according to the amplitude of this signal whether greater than the background noise reference voltage, exclude the interference of background noise, indicate the stateless that has of speech, and 3. this status signal is delivered to the Fare determined by travel time unit.The single-chip microcomputer SCM of Fare determined by travel time unit in 3. these two status signals of 5. 6. sending here with voice recognition circuit of monitor signal sound identification circuit at any time like this, when find that the signal tone with the ring-back tone same frequency exceeds the longest interrupt interval of ring-back tone of standard break period morely, or find that speech continuity duration accumulative total reaches a certain set point, can be judged to be called off-hook, the conversation beginning.At this moment, 3. the Fare determined by travel time unit starts the internal clocking of single-chip microcomputer SCM immediately, and telephoometry begins, and when circuit (b) detects 7. on-hook of telephone set, shows end of conversation, then finishes timing, and timing result is the duration of call; The single-chip microcomputer SCM telephone number that will cry according to this group simultaneously, the Fee Schedule in EPROM has been solidified in inquiry, find rate and other expense, through computing, promptly obtain this cost of the phone call, the telephone number that this group cries and the duration of call and this cost of the phone call will be delivered to display circuit successively and externally show, simultaneously this cost of the phone call will be added in the all-in charge, and all-in charge deposited among the EEPROM, all-in charge will not lost after the power down.

Since the utility model in the circuit of telephone charge counter, installed additional signal tone identification phone 5. with voice recognition circuit 6., make that this taximeter can be according to various signal tones and the speech on the telephone loop, correctly judge called off-hook, thereby realized a kind of automatic telephone taximeter that switch provides called off hook signal (generally being anti-partitioned signal) that need not.

Description of drawings:

Fig. 1: the utility model contour structures schematic diagram

Fig. 2: the utility model rear board figure

Fig. 3: the utility model schematic diagram

Fig. 4: embodiment of the utility model

Fig. 5: second embodiment of the utility model

Fig. 6: the 3rd embodiment of the utility model

Provide embodiment of the present utility model below in conjunction with accompanying drawing, accompanying drawing just is used for further specifying, explaining the utility model, rather than in order to limit the utility model.

The essential implementation of the technical solution of the utility model be how specific implementation signal tone identification circuit 5. with voice recognition circuit 6., other circuit all are known technology in the technical program.

Embodiment 1, with reference to figure 4:

Specifically being constructed as follows of the signal tone identification circuit of present embodiment:

By integrated operational amplifier IC ₁, resistance R ₃, R ₄, R ₅, R ₆, R ₈And capacitor C ₇, C ₈Constitute band pass filter (f), its centre frequency is set at the ring-back tone frequency of standard, and the signal tone with the ring-back tone same frequency that so only allows 8. to come up from telephone loop passes through.Its output footpath C ₉Be coupled to the 3rd end of LM567.Integrated circuit LM567, resistance R ₁, R ₂And capacitor C ₃, C ₄, C ₅Constitute single audio frequency decoding circuit (g), its centre frequency is by R ₁And C ₃Value determine, be set to the standard ringback voice frequency equally, when LM567 the 3rd brings out the signal tone of existing and ring-back tone same frequency, the 8th end of LM567 will become low level from high level generally speaking, and deliver to the I/O mouth line L of Fare determined by travel time unit single-chip microcomputer SCM 3. ₁On.

Specifically being constructed as follows of the voice recognition circuit of present embodiment:

By integrated operational amplifier IC ₂And resistance R ₇, R ₉, R ₁₀, R ₁₁, R ₁₂And capacitor C ₁, C ₂, C ₆The circuit of being formed has constituted band stop filter (h), and its centre frequency is set to the standard ringback voice frequency equally, like this at IC ₂Output obtains is the summation of the various AC signal on the telephone loop beyond the signal tone of filtering and ring-back tone same frequency basically, mainly comprise speech and background noise.IC ₂Output by capacitor C ₁₀Be coupled to background noise discriminator circuit (i), in circuit (i), input signal at first passes through D ₁, D ₂And R ₁₃, C ₁₁The current rectifying and wave filtering circuit of forming becomes direct current signal, again through R ₁₄Deliver to comparator IC ₃Negative terminal, IC ₃Positive input terminal on Vref be for distinguishing the reference voltage that speech and background noise are set, when the voltage on the negative terminal during less than Vref, expression does not still have speech, IC ₃Be output as " 1 ", when negative terminal voltage during greater than Vref, speech, IC appear in expression ₃Be output as " 0 ", another root I/O mouth line L of single-chip microcomputer is delivered in this output ₂On.

3. the Fare determined by travel time unit passes through L like this ₁, L ₂These two I/O mouth lines, at any time 8. the monitoring user line goes up signal tone and the speech that whether exists with the ring-back tone same frequency, solidify ring-back tone and speech analysis software in EPROM by operation again, can correctly judge called whether off-hook, thereby realize the full-automatic function of no antipole automatic telephone taximeter.

Embodiment 2, with reference to figure 5:

The difference of present embodiment and embodiment 1 is: the integrated operational amplifier IC in the present embodiment ₁, IC ₂And resistance R ₁₇, R ₁₈, R ₁₉, R ₂₀, R ₂₁, R ₂₂, R ₂₃And capacitor C ₁₂, C ₁₃, C ₁₄Formed the band pass filter (f) in band stop filter in the voice recognition circuit (h) and the ring-back tone identification circuit jointly, at IC ₁Output can obtain bandpass filtering output, and at IC ₂Output can obtain bandreject filtering output, their centre frequency is set to the ring-back tone frequency of standard equally.Other is identical with embodiment 1.

Embodiment 3, with reference to figure 6:

The difference of present embodiment and embodiment 1 is:

5. the signal tone identification circuit of present embodiment only is made up of single audio frequency decoding circuit (g), and has removed band pass filter (f), and this is feasible satisfying under the situation that general interference free performance requires, and other is identical with embodiment 1.

Claims (2)

1, telephone charge counter, particularly there is not antipole automatic telephone taximeter, it has shell and is positioned at the circuit board of shell, on circuit board, has power circuit 1., general peripheral interface circuit 2., the Fare determined by travel time unit 3., 4. display circuit is characterized in that: also have on the circuit board in the enclosure the signal tone identification circuit 5. with voice recognition circuit 6.; 5. the signal tone identification circuit all is connected to a peripheral interface circuit output 2. with voice recognition circuit input 6., has all signals that 8. telephone loop is gone up on this output; The signal tone identification circuit 5. output and voice recognition circuit output 6. be connected to Fare determined by travel time unit single-chip microcomputer SCM 3. respectively two I/O mouth lines on, recognition result is separately delivered to single-chip microcomputer SCM;

5. described signal tone identification circuit only is made up of single audio frequency decoding circuit (g); The centre frequency of single audio frequency decoding circuit (g) is set to the ring-back tone frequency of standard, it is a kind of circuit that can identify with the signal tone of ring-back tone same frequency, its input is signal tone identification circuit input 5. just, and its output is signal tone identification circuit output 5. just;

6. described voice recognition circuit is made up of band stop filter (h) and background noise discriminator circuit (i); The centre frequency of band pass filter (h) is set to the ring-back tone frequency of standard, its input is voice recognition circuit input 6. just, its output is connected to background noise discriminator circuit (i), in background noise discriminator circuit (i), its input at first is connected to a current rectifying and wave filtering circuit, this current rectifying and wave filtering circuit becomes direct current signal to the signal of input, and this direct current signal is delivered to an input of a voltage comparator, and another input of this voltage comparator is coupled with a background noise reference voltage, the output of this voltage comparator is the output of background noise discriminator circuit (i), also is voice recognition circuit output 6..

2, no antipole automatic telephone taximeter according to claim 1, it is characterized in that: 5. described signal tone identification circuit is made up of bandpass filtering (f) and single audio frequency decoding circuit (g); The centre frequency of band pass filter (f) is set to the ring-back tone frequency of standard, and its output is connected to the input of single audio frequency decoding circuit (g), and the output of single audio frequency decoding circuit (g) signal tone identification circuit output 5. just.

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