JPH08251674A - Transmitter-receiver - Google Patents

Abstract

PURPOSE: To improve operation while maintaining security by judging normality when a variable code to be gradually promoted by a prescribed format is included with a prescribed range from a preceding received variable code. CONSTITUTION: When a switch on a transmitter is turned on, a transmission code constituted of a 24-bit vehicle identifying ID code previously set up in a memory and a 16-bit variable code of which value is increased one by one e.g. in accordance with operation frequency is generated and an optical transmission signal obtained by modulating a 38kHz signal by the transmission code is transmitted. A receiver 4 loaded on a vehicle demodulates a signal received through a light receiving part 41 and an ID code comparator 50 collates the extracted 10 code with an ID code stored in an ID code memory 49. A variable code memory 52 stores the preceding received and processed variable code and a variable code comparator 51 judges a normal signal when the current received variable code is larger than the preceding received variable code and is included with a range of +1 to +256 and unlocks the door of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving device used for remote control such as unlocking of a door of a vehicle.

[0002]

2. Description of the Related Art Conventionally, a transmitter / receiver of this type is disclosed in Japanese Patent Laid-Open No.
It is disclosed in Japanese Patent Publication No. 336185 and is represented by a block diagram as shown in FIG. In FIG. 5, the transmitter 1 generates transmission data including a fixed code stored in the ID code memory 13, a variable code added by the variable code addition unit 14 according to the number of operations, and transmission information. The data generation unit 12 is provided, and the receiver 2 is provided with a data decryption unit 24 that decrypts the transmission data transmitted from the transmitter 1. The data decoding unit 24 determines whether the fixed codes match and compares the addition code added by the reception number addition unit 25 with the variable code to determine whether or not the data may be received. to decide. When the variable code and the addition code are different,
Based on a predetermined operation in the transmitter 1, the reception number addition unit 2
The addition code of 5 is skipped and updated according to the variable code.

Therefore, for example, when another person operates the transmitter 1 several times and then transmits to the receiver 2, the transmission data cannot be accepted because the variable code and the number of receptions do not match. However, when the owner himself mistakenly operates the transmitter 1 several times and then transmits to the receiver 2, the reception count of the receiver 2 is skipped and updated by a predetermined operation to receive data. This predetermined operation is, for example, when the first transmission data is not accepted by the receiver 2, it is transmitted a predetermined number of times, for example, three times in succession. Accept data.

Further, as other conventional transmission / reception devices, Japanese Patent Application Laid-Open Nos. 1-212998 and 1-27867.
As described and disclosed in Japanese Patent Publication No. 1 and the like, it is known that the digital signal is divided into a first signal and a second signal, and the digital signal is changed at any time according to the number of transmissions to prevent theft.

[0005]

However, in the conventional transmitter / receiver as described above, if the fixed code and the variable code do not always match, the transmitter 1 is mistakenly regarded as not a legitimate signal. In the case of a blank hit, there is a problem that the device cannot be immediately subjected to reception control and must perform a predetermined operation.

The present invention solves such a conventional problem. Even if the variable code stored in the receiver does not match due to the variable code being changed by hitting the transmitter blank, You can immediately control the reception of the device and store it in the receiver by performing a predetermined operation for the initialization of the variable code (for example, returning the variable code to 0) that occurs when the battery of the transmitter is replaced when the battery is exhausted. It is an object of the present invention to provide a transmitter / receiver capable of forcibly matching the generated variable code with the variable code of the transmitter and improving security and usability.

[0007]

In order to solve the above problems, a transmitting / receiving apparatus of the present invention is a transmitting / receiving apparatus comprising a transmitter for transmitting information and a receiver for receiving information from the transmitter. In the transmitter, at least an operation unit operated by a user, transmission data based on a fixed code for identifying the transmitter and a variable code corresponding to the number of operations of the operation unit are formed, A receiver for receiving the transmission data transmitted from the transmitter, a data decoder for decoding the output data from the receiver, and a transmitter for transmitting the transmission data. A variable code storage unit that stores the variable code decoded by the decoding unit each time it is received, a fixed code storage unit that stores a fixed code in advance, and the fixed code and the variable code respectively. Reception control is performed only when the comparator to be compared and the comparison result by the comparator have the same fixed code and the latest variable code is within a predetermined range from the previously received variable code, and the fixed code does not match. However, when the variable code is different, based on a predetermined operation on the transmitter side, the variable code in the receiver is updated to the latest variable code transmitted from the transmitter side, To do.

[0008]

According to the above structure, the transmitter is composed of a fixed code which is an identification code (ID code) unique to the device and a variable code which is changed in a predetermined order corresponding to the number of transmissions of the transmitter. Is transmitted.

In the receiver which receives the signal transmitted from the transmitter, the code received by the receiver is stored and the new and old variable codes are compared only when the fixed codes match. Based on the comparison result, the control unit progressively changes the previously stored variable code in a predetermined order with the newly stored variable code, and the newly stored variable code falls within a certain range. The reception operation is controlled only at certain times.

Further, the control unit has the same fixed code, but the comparison result of the variable codes is different as in the case where the variable code is initialized by the regular transmitter when the battery is replaced due to exhaustion of the battery. In this case, the variable code in the comparator stored in the receiver is updated to the latest variable code transmitted from the transmitter based on a predetermined operation in the transmitter.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmitter / receiver according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a circuit block diagram of a transmitter 3 of the transmitting / receiving apparatus of this embodiment. In FIG. 1, reference numeral 30 denotes a power source composed of a lithium battery, which is a transmitter 3
In order to make the whole function, 31 indicates a switch section (SW section) as an operation section for performing lock and unlock operations, and 32 indicates a one-time microcomputer (OTP microcomputer) for storing an ID code. Memory 3
3, a variable code addition unit 34, a control unit 35, an oscillation modulation unit 36, and a code output unit 37. 38
Is an amplifier circuit for driving an LED, and is connected between the light emitting unit 39 including an infrared light emitting LED and the OTP microcomputer 32. Here, the OTP microcomputer 32, the amplifier circuit 38, and the light emitting section 39 constitute a transmitting means.

FIG. 2 shows the receiving section 40 and the controller section 4.
7 shows a circuit block diagram of a receiver 4 consisting of 7. In FIG. 2, reference numeral 40 denotes a receiver, which is a light receiver 41 that receives an optical signal.
, An Amp (amplifier) 42, a BPF (bandpass filter) 43, a detection circuit 44, and an output waveform shaping circuit 45 as a data decoding unit. Reference numeral 46 is a vehicle battery, and the voltage control unit 48 is an electronic control power supply for the receiving unit 40 and the controller unit 47 as a constant voltage power supply of 5 [v]. The controller unit 47 includes an ID code storage memory (E ² PROM) 49 as a fixed code storage unit.
And an ID code comparator 50 and a variable code comparator 51 that form a comparator, a variable code memory 52 as a variable code storage unit, and a relay control unit 53 as a control unit.

The operation of the transmitter / receiver configured as described above will be described below. FIG. 3A shows the structure of the code, and FIG. 3B shows the allocation of the data bits of the code. In FIG. 3, 54, 56
Is a pulse, and 55 and 73 are the intervals of each pulse.

FIG. 4 shows a signal processing flow for the output of the output waveform shaping circuit 45 which shapes the optical signal received by the receiving section 40. In the above embodiment, when the switch section 31 is operated, an input signal is added to the OTP microcomputer 32, and a preset ID code is called from the ID code storage memory 33 in the OTP microcomputer 32. Switch part 3
The variable code corresponding to the number of operations of 1 is input to the control unit 35.

In the control unit 35, as shown in FIG. 3 (a), the signal code is composed of pulses 54 and 56, and binary "0" and "0" depending on the interval 55 between the pulses 54 and 56. Define 1 "(Define narrow intervals as" 0 "and wide intervals as" 1 ")
A code consisting of "0" and "1" is formed. As shown in FIG. 3B, the allocation of the data bits of the above code is, for example, 1 to 24 when the number of bits of all codes is 40.
The first bit is the manufacturer code 69, and the first to fourth bits are the manufacturer code 69. This is common to all vehicles and is used as a code for distinguishing between manufacturers or between vehicle types (implementation). In the example, the operation for the first 1 to 4 bits is omitted), and the next 5 to 24 bits are the ID code 70.
This is to be assigned to each vehicle. Next 25-4
The 0 bit is used as a variable code 71, and is controlled so as to change at any time such that the number increases by 1, for example, according to the number of times the switch unit 31 is operated, and the control unit 35 controls the manufacturer code, the ID code, and the variable. The code is combined with the code to form the entire transmission code 72. The pulses 54 and 56 in the transmission code 72 are generated by the oscillation modulator 36.
For example, the frequency is modulated with 38 [KHZ] (not shown),
From the code output unit 37, the signal is transmitted from the light emitting unit 39 through the amplifier circuit 38. The signal transmitted from the transmitter 3 is
The signal received by the light receiving unit 41 of the receiver 4 is amplified by the Amp 42 and the frequency component modulated by the BPF 43 is removed.

The operation will be described below with reference to the flowchart of FIG. The output waveform shaping circuit 45 restores the received signal into a coded signal, decodes the coded signal, and receives the code (step # 5).
7). Next, the coded signal is stored in the ID code storage memory 4
Same ID as transmitter 3 stored in advance in 9
Call code from E ² PROM 49 (step # 5
8) In the ID code comparator 50, the ID code is I
Whether or not it is a D code is verified (step # 5).
9).

When the ID code coincidence is determined in step # 59,
If they do not match, the determination is NO, and the process thereafter is not performed and the process returns to before the code is received in step # 57.

When the variable code of the transmitter 3 is initially reset when the battery is replaced due to exhaustion of the battery or when the number of operations exceeds a certain range, the ID codes match. Then, as the next process,
Performs variable code comparison. At this time, the variable code memory 5
2 stores the variable code received last time, and the variable code is called from this variable code memory 52 (step # 60) and compared with the variable code received this time (step # 61). If the result is that the variable code received this time is larger,
If it is within 6 (the current variable code is +1 to +2
If it is within 56, it is programmed to be regarded as a legitimate signal). As a legitimate signal, a coincidence signal is output (step # 63), and lock or unlock output control is performed (step # 64). Lock or unlock the door.

The variable code comparison result of step # 61 is N.
When it is O, the received variable code is temporarily stored as the sub-variable code in the variable code memory 52. Next, the code of step # 57 is received, and the ID code 7
When 0 matches and the variable code 71 is not within +1 to +256 than the variable code received as the normal signal two times before, it is compared with the previously stored sub variable code (step # 66), Variable code is more than previous value +
If it is 1, the sub-variable code is rewritten (step # 67). Next, it is judged whether or not this processing is continuous 5 times (step # 68), and when it is continuous 5 times, it is judged as a signal of a legitimate transmitter, and the variable code is written in the variable code after continuous 5 times. Frog (step # 62).

As described above, according to the above embodiment, the transmission code from the transmitter 3 is composed of the ID code 70 and the variable code 71 in the case where the transmission data is changed in order to prevent the theft of the vehicle. The variable code 71 is set so that the number increases by one according to the number of transmissions, and the receiver 4
If the ID code 70 matches and the variable code 71 is larger than the previously received variable code 71 and this numerical value is 2 ⁸ times or less, that is, 256 times or less,
Since it is judged as a legitimate signal, even if the transmitter 3 is hit without aiming at the receiver 4, it will be received as a legitimate signal up to 2 ⁸ (256) times, so it is assumed that the transmission code is copied. However, since the variable code 71 changes every transmission and the past code is not accepted, it is easy to use because it is not stolen.

Further, since the transmitter 3 uses the lithium battery 30 or the like for downsizing, the battery has a short life, and when the battery is replaced, the variable code 71 in the transmission code is OTP.
Since the data is stored in the RAM (Random Access Memory) of the microcomputer 32, when it is reset to “0” after the initial reset, the transmitter 3 is transmitted to the receiver 4 continuously, for example, five times or more. In this case, even if the judgment of the variable code comparison (step # 61) is NO, the sub-variable code call (step # 65) and the sub-variable code comparison (step # 66) are performed, and the variable code received last time is more than the previously received variable code. When it is +1, the sub-variable code is rewritten (step # 67). By repeating this, the main variable code of the receiver 4 is forcibly matched to the initialized variable code. Therefore, the correspondence of the variable code at the time of battery replacement and the transmitter 3 256 times or more are required. The variable code matching between the transmitter 3 and the receiver 4 after the idle operation can be performed by a simple operation of the transmitter 3.

[0022]

As described above, according to the present invention, a transmitter has a fixed code which is an identification code unique to the device, and a variable code which is changed in a predetermined order corresponding to the number of transmissions of the transmitter. The receiver that receives the signal transmitted from the transmitter, which stores the code received by the receiver, compares the new and old variable codes only when the fixed codes match. Then, based on the comparison result, the control unit progressively changes the previously stored variable code in a predetermined order by the newly stored variable code, and the newly stored variable code has a constant value. Only when the range is within the range, the receiving operation is controlled, and the fixed code matches.However, the variable code is initialized in the regular transmitter when the battery code is replaced due to exhaustion of the battery. When the result of comparison is different, the variable code in the comparator stored in the receiver can be updated to the latest variable code sent from the transmitter based on a predetermined operation in the transmitter. it can.

Therefore, even if the variable code does not match the variable code stored in the receiver due to the variable code being changed by hitting the transmitter blank, the device can be immediately controlled for reception and the battery of the transmitter is exhausted. At the time of initializing the variable code that occurs when the battery is replaced, the variable code stored in the receiver can be forcibly matched with the variable code of the transmitter by performing a predetermined operation, which improves security and usability. Can be improved.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a transmitter of a transceiver according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram of a receiving unit and a controller unit of the embodiment.

FIG. 3 is an explanatory diagram of a transmission code according to the embodiment.

FIG. 4 is an operation flow chart from signal reception in the same embodiment.

FIG. 5 is a circuit block diagram of a conventional transceiver device.

[Explanation of symbols]

 31 switch 32 OTP microcomputer 45 output waveform shaping circuit 49 ID code storage memory 50 ID code comparator 51 variable code comparator 52 variable code memory 53 control unit

Claims (1)

[Claims] 1. A transmission / reception device comprising a transmitter for transmitting information and a receiver for receiving information from the transmitter, wherein the transmitter includes at least an operation unit operated by a user. The receiver is provided with a transmitting unit that forms transmission data based on a fixed code for identifying the transmitter and a variable code corresponding to the number of operations of the operation unit, and transmits the transmission data. A receiving unit that receives the transmission data transmitted from the transmitter, a data decoding unit that decodes the output data from the receiving unit, and a variable code storage unit that stores the variable code decoded by the decoding unit for each reception. A fixed code storage unit that stores a fixed code in advance, a comparator that compares the fixed code and the variable code with each other, and a comparison result by the comparator that the fixed code is the same. Receive control is performed only when the same and latest variable code is within a certain range from the previously received variable code, and when the fixed code matches but the variable code is different, the specified operation on the transmitter side is performed. And a control unit for updating the variable code in the receiver to the latest variable code transmitted from the transmitter side based on the above.