JPS6126337A - Small-sized radio equipment - Google Patents

Abstract

PURPOSE:To use the identification number of a radio equipment even when the equipment is lost or stolen, by setting a storage circuit storing the identification number for distinguishing its own equipment from others to an unusable condition and stopping the transmitting and receiving functions when a specified code is received. CONSTITUTION:Received signals are inputted in a CPU4 through a radio section 2 and waveform shaping section 3. Then the CPU4 compares its own selective calling number of a PROM7 with the signal from the waveform shaping section 3 and, only when both coincide with each other, drives a loudspeaker 9 and LCD 5. The PD terminal of the CPU4 is connected with the PD terminal of the PROM7 through a PROM destructing section 6. When a PROM destruction discriminating bit is ''1'' and message code information receives a signal of a specific code, the CPU4 actuates the destructing section 6 and destructs the PROM 7. As a result, the receiver cannot be used unless the PROM7 is exchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small radio device that has an identification number in its own memory circuit for distinguishing itself from other devices.

Particularly, by receiving a message signal following its own selective calling number, activating a ring alarm, and displaying the message signal on a display.

The present invention relates to a selective call receiver with a display function that displays a call.

[Conventional technology]

Currently, this type of selective call receiver uses a programmable read-only memory (PROM) as a storage means for storing its own selective call number for determining whether or not the call is to itself.
ly Memory) is used. Selective calling number.

As will be explained in detail later, since it is 20 bits, a maximum of about 1 million different numbers can be obtained. However, the number of selective call receivers that can be put into practical use is only a fraction of the number since one selective call receiver usually has a plurality of two selective call numbers, even though the numbers are prohibited. Therefore, when the subscriber population increases and the number of available numbers reaches its limit, users will be forced to use selective call numbers of selective call receivers that have been lost, stolen, or otherwise unknown. However, if the selective calling number of the unknown receiver is assigned to a new subscriber, if the unknown receiver's selective calling number is assigned a new number and someone else is using the lost one, one selective calling number will be used. If the calling number is assigned to two devices, the new subscriber may be called by a stranger, or the other device receiving information services using the same number as the new subscriber may receive information services without paying the fee. Rare 2
It becomes a problem.

[Problem to be Solved by the Invention 3] For the reasons mentioned above, it has not been possible to use unknown selective call numbers in conventional selective call receivers. This is contrary to the effective use of limited selective calling numbers.

Further, even if the selective call number of the unknown selective call receiver is not assigned to the new subscriber.

Selective call receivers that are unknown can receive information services during group calls. As described above, conventional selective call receivers cannot prevent improper use during group calls.

The problems above have been explained using a selective call receiver with a display function as an example of a small radio, but other small radios have a similar memory circuit that stores an identification number to distinguish between one's own machine and other machines. A similar problem exists with transmitters and receivers such as digital radios and transceivers.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small radio device that does not require a missing identification number even if it is lost or stolen.

Another object of this invention is in case of loss or theft.

It is an object of the present invention to provide a small radio device that can prevent improper use of the small radio device.

Another object of the present invention is to permanently disable a selective call receiver that cannot be recovered by the calling party due to loss or theft unless the selective call number storage unit is replaced. The aim is to provide the opportunity.

[Means for solving problems]

According to the present invention, in a small radio device that has an identification number in its own memory circuit for distinguishing itself from other devices, when a specific code is received, the memory circuit storing the identification number By making the small radio device unusable, it is possible to obtain a small radio device characterized in that it has a function of stopping the transmitting and receiving functions and making the small radio device unusable unless the storage circuit is replaced.

Furthermore, according to the present invention, a message signal is received following a signal indicating the user's selective call number, and a call alarm is activated, and the message signal is displayed on a display, thereby displaying a call display. In a selective calling receiver with a display function, if a message signal with a specific code is received after receiving the signal indicating the own selective calling number, the memory circuit storing the own selective calling number cannot be used. By doing so, the receiving function is stopped, a specific message is displayed on the display, and the function of disabling the selective call receiver on the front of the display unless the memory circuit is replaced. A selective call receiver with a display function is obtained.

Further, according to the present invention, in the selective call receiver with display function, after receiving the signal indicating the own selective call number,
When a message signal with a specific code is received, the receiving function is stopped by disabling the memory circuit storing the own selective calling number, and the calling alarm is activated. There is obtained a selective call receiver with a display function, characterized in that it has a function of displaying a message on the display and disabling the selective call receiver with a display function unless the memory circuit is replaced. .

〔Example〕

An embodiment of the present invention will be described below with reference to one drawing.

FIG. 1 is a block diagram of a selective call receiver with a display function according to an embodiment of the present invention. The radio signal coming in from antenna 1 is amplified and detected by radio section 2.

After demodulating and shaping into a digital signal in the secondary waveform shaping section 3,
ing Unit) 4. At this time, the CPU 4 compares its own selective call number in the FROM 7 with the signal from the waveform shaping section 3, and outputs a sound signal to the driver 8 to drive the speaker 9 only when both numbers match. Also CPU
4 is.

Decipher the message information following the selective call signal.

LCD (Liquid Crystal I) 5pl
ay) 5 to provide visual information to the user.

The reset switch 11 is connected to the CPU 4.
Stops the sound of the speaker 9 and stops and starts the display on the LCD 5. The crystal oscillator 10 is used to generate a clock signal for operating the CPU 4. Switch 12 is a power switch. FR characterized by the present invention
The OM destroyer 6 is connected to the CPU 4 and the PROM 7. The PD terminal of the CPU 4 is connected to the PD terminal of the FROM 7 through the FROM destruction section 6. CPU
4 receives the message information and determines that the FROM destruction judgment bit is "1" and that the message information is a specific code.

CPU 4 destroy signal (PD double signal is issued, this P
The PROM destruction unit 6 is activated by the D-fold signal, and the FROM
7 and make the 9 selective call receiver unusable.

FIG. 2 shows the structure of the received signal used in the embodiment of FIG. In Figure 2(a).

P is a preamble signal, F is a frame synchronization signal.

N is selective calling number signal, 11 +1.2 +I3+
. . . indicates a message information signal.

FIG. 2(b) shows an example of the structure of the selective calling number signal N.

FIGS. 2(c) and 2(d) show an example of the structure of the message information signal I. FIG. Figures 2 (b), (C), and (d) are all shown.

1 bit even parity E for BCH (31, 21)
P is added. When the MSB (most significant bit) is °'0'', it indicates that the following signal is a selective calling number signal, and when the MSB is 1'', it indicates that the following signal is a message information signal. It shows.

Further, the second bit from the MSB of the message information signal indicates a FROM destruction judgment bit used in the present invention. If the FROM destruction judgment pit is tt On,
The following 19 pins indicate normal message information, and if the FROM destruction judgment pit is 1'',
The following 19 bits indicate a specific code.

FIG. 3 is a block diagram of PROM 7 of FIG. 1.

The selective call number is stored in the memory cell 301, passes through the address buffer 302, and is outputted to the output buffer 303 as the selective call number of the memory cell 301 designated by the CPU4 color address signal.

In the output buffer 303, the CE signal 305 input to the 08 section (chip enable section) 304 is positive logic and is Low.
("O"), the 2 selection call number is output to the CPU 4. When the CE signal 305 is High, the output buffer 303 has no impedance.

Prohibit output of selective calling number. The CPU 4 sets the CE signal 305 to I, ow only when reading.

Figure 4 shows the CPU 4 of the FROM destruction circuit 6 in Figure 1.
and the connection status to PROM 7. CPU 4 is P
Only the output stages of the D terminal and the CE terminal are shown, and only the input stage of the CF section 304 of FROM7 is shown.

In the CPU 4, the CF terminal of the CPU 4 is the open collector output of the transistor 401.

The collector of the transistor 408 is connected to the PD terminal. The collector of transistor 408 is connected to power supply vcc via resistor 407. The emitters of transistors 401 and 408 are grounded.

Further, in FROM 7, both CE terminals are connected to fuse 402 within FROM 7. The other end of fuse 402 is connected to the collector of transistor 404 and the base of transistor 406. transistor 40
The emitters of 4 and 406 are grounded. ! ! , the collectors of transistors 404 and 406 are connected to resistor 403.
and 405, and the resistors 403 and 405 are connected to the power supply v
It is connected to co. The base of transistor 404 is connected to the PD terminal. The collector of transistor 406 is connected to the input of output buffer 303.

The PD terminal of the CPU 4 is connected to the base of the transistor 411 of the FROM destruction circuit 6 and the PD terminal of the FROM 7. Transistors 411.404.

It plays the role of a switch that turns on when the PD double signal is High and turns off when it is Low. FROM destruction circuit 6
, the emitters of transistors 409 and 412 are connected to power supply vc0. The base and collector of transistor 409 are shorted.

The base of transistor 409 is connected to the base of transistor 412. The collector of transistor 409 is connected to resistor 410. The collector of the transistor 412 is connected to both terminals CE of the CPU 4 and the PROM 7. The other end of the resistor 410 is.

Connected to the collector of transistor 411.

In the FROM destruction circuit 6, the transistors 411 and 404 are turned on when the PD double signal from the CPU 4 is High.

The current determined by the value of the resistor 410 flows through the transistor 409.
flows to the collector. This is because the collector and base of transistor 409 are short-circuited.

A current determined by the resistor 410 also flows through the transistor 412 whose base potential is the same as that of the transistor 409 .

At this time, the CPU 4 determines that the CE multiplied signal will be High. That is, the impedance between the collector and emitter of the transistor 401 is High. Therefore, the collector current flowing through the transistor 412 passes through the fuse 402 and flows into the on-state transistor 404 IC for 5 minutes. This current blows fuse 402. Fuse 402 power; when it breaks.

9. Transistor 406 in FROM 7 can no longer receive the CF multiplied signal. The base potential of the transistor 406 is determined by the impedance between the resistor 403 and the collector-emitter of the transistor 404. If the resistor 403 is made sufficiently smaller than the collector-emitter impedance of the transistor 404, the transistor 406 is always on. Therefore, the input of the output/9 buffer 303 is always LOW, and the contents of the memory cell 301 are not output. In this state, the CE signal is always H.
It corresponds to the fact that it is set to ``high''.

The state of FROM 7 due to the combination of the PD double signal and the CE double signal is as follows.Here, in the case of the PD double signal H and the CE double signal L, the transistor 401 is also turned on, and the current flowing through the heater 402 flows into the transistor 401. Inflow is divided. Therefore, P
When D is H and CE is L, CPU 4
It has to be banned by the government.

Next, FIG. 5 is a flowchart of the operation of this embodiment.

After turning on the power (501), CPU 4 transfers the contents of PROM 7 to RAM (Random Access Memo
ry ) from the CE double signal and PD double signal during standby.

Use CE multiplied signal and PD multiplied signal during reading. If it is successfully retrieved (502), the state is in the waiting state for receiving a call (503).
Then, this loop is repeated every time there is a call. When the call is received, the next mesoceno information is received (504). Next, determine whether the FROM destruction determination bit is 1'' or '°0'' 50. ．． 5), if it is "'O", normal operation is performed (506) and the process returns to call reception (503). F.R.O.
If the M destruction determination bit is II II II, determine whether it is a predetermined specific code (507).
, if they are different, it is considered an error.

Return to call reception. If it is a specific code, set the CE double signal to H, disable reading, and then set the PD double signal to H.
Turn off heat 402 in FROM 7 (508
). Then, set the PD double signal and the CE double signal to L and FRO
It is determined whether the fuse 402 is blown based on whether the contents of M7 can be read (509).

If the contents of FROM 7 can be read, fuse 402
7. It is considered as uncut. Return to step 508 and repeat the same operation. Fuse 402 is blown and FRO
If M7 is destroyed, calls will no longer be received by the PROM.
Since this is not possible unless 7 is replaced, the LCD 5 displays that it cannot be used, and the speaker 9 is driven to make a sound. Such a display and sound state continue until a certain period of time passes or until the reset switch 11 is activated.

If a certain period of time has elapsed, and the reset switch 11 is still reset, the sound stops and the display disappears (512).
), and B S (Battery Saving)
Prevent unnecessary battery consumption by leaving the battery on (51)
3).

BS is something that turns the receiver on and off at regular intervals, and in this case, when the BS is left on, the receiver is always off.

This completes one routine, but if the FROM 7 is destroyed, even if the switch 11 is turned back on, the reception operation will not be performed, and only a display and sound will start to notify that it is unusable.

If you are receiving service from an illegally obtained selective call receiver, put a stop code etc. in the 70 program of CPU 4 to prohibit the use of the receiver, so that the receiver cannot be used while the switch is on. can be stopped. Furthermore, once the stop code is received, the receiver can be stopped using the receiver while the battery is still available by storing the batch leaver, qua, 7°, etc. in the RAM. However, in the former case, the switch is turned off.

In the latter case, if you remove the battery for the Terry Pack amplifier, the prohibition will be lifted when you use it again and it will be useless. Therefore, the selective calling number of the receiver had to be a blank number.

According to the present invention, once the switch is turned on and the FROM destruction code is received, the FROM is destroyed without the CE large input of the FROM being destroyed and the PROM itself becoming permanently unusable.
M must be replaced and the receiver becomes unusable. Therefore, there is no need to make the selective calling number redundant in case of loss or theft, and the number can be used effectively.

In addition, PROM 7 of the above-mentioned embodiment is RANDOM
ACCESS MEMORY (RAM) and Back
UP battery combination or EPROM (erasable PR
OM) or EEPROM (electrically erasable FRO
Of course, this method can also be easily applied to the case where the storage unit is replaced with M).

In the above-described embodiment, the present invention was applied to a selective calling receiver with a display function. It goes without saying that the present invention can be similarly applied to other small infrared devices having circuits, such as personal radios, transceivers, and other transceivers.

〔Effect of the invention〕

As explained above, according to the present invention, in a small radio device having a memory circuit that stores an identification number for distinguishing between the device itself and other devices, when a specific code is received, the memory circuit is used. By disabling the transmitting and receiving functions, a small radio device having a function of making the small radio device unusable unless the memory circuit is replaced can be obtained.

Therefore.

Even if the small radio device is lost or stolen, there is no need to make the identification number of the small radio device redundant, and the number can be used effectively. Also,
If the small wireless device is lost or stolen, it is possible to prevent the illegal use of the small wireless device when making a group call.

The clues below

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a selective calling receiver with a display function according to an embodiment of the present invention, FIG. 2 is a diagram showing the structure of a received signal used in the embodiment of FIG. 1, and FIG. FIG. 4 is a block diagram showing details of the FROM 7 shown in FIG. 1, and FIG. 4 shows the CPU 4 and PROM of the FROM destruction circuit 6 shown in FIG.
FIG. 5 is a flowchart of the operation of the embodiment shown in FIG. 1. ■ is an antenna, 2 is a radio section, and 3 is a waveform shaping section. 4 is the CPU, 5 is the LCD, 6 is the PROM destruction section, and 7 is the FROM. 8 is the driver, 9 is the speaker, 10 is the crystal, 1
1 is Lycee, Tosuinochi, and 12 is Switch. 301 is a memory cell, 302 is an address buffer 130
3 is the output cover, fa, 304 is the CF part (chip/input pull part), 401.404.406.4.08409.
411.412 is a transistor, 403°405.40
7.410 is a resistor, and 402 is a heat.・Embedded in - σ127) Rational ± Yosuke Goto, -Figure 2 C Figure 4

Claims (1)

[Scope of Claims] 1. In a small radio device that has an identification number in its memory circuit for distinguishing itself from other devices, when a specific code is received, the memory that stores the identification number A small radio device characterized by having a function of disabling a circuit to stop transmitting and receiving functions and making the small radio device unusable unless the memory circuit is replaced. 2.Following the signal indicating its own selective call number, it receives a message signal and activates the call alarm,
By displaying the message signal on a display,
In a selective call receiver with a display function that displays a call,
If a message signal with a specific code is received after receiving the signal indicating the self-selective calling number, the receiving function is stopped by disabling the storage circuit that stores the self-selective calling number. A selective call receiver with a display function, characterized in that it has a function of displaying a specific message on the display and disabling the selective call receiver with a display function unless the memory circuit is replaced. 3.Following the signal indicating its own selective call number, it receives a message signal and activates the call alarm,
By displaying the message signal on a display,
In a selective call receiver with a display function that displays a call,
If a message signal with a specific code is received after receiving the signal indicating the self-selective calling number, the receiving function is stopped by disabling the storage circuit that stores the self-selective calling number. The present invention also has a function of activating the call alarm, displaying a specific message on the display, and disabling the selective call receiver with display function unless the memory circuit is replaced. Selective call receiver with display function.