JPH04336185A - Transmitter receiver - Google Patents

Abstract

PURPOSE:To improve the security function in a transmitter-receiver for an automatic remote controlling device or the like. CONSTITUTION:A transmitter 1 has a data generating part 12 for forming transmitting data comprising a fixed code memorized in an I/D code memory, a variable code by a variable code adding part 14 corresponding to a number of operation, and transmitting information, and a receiver 2 has a data reading part 24 for reading the transmitted data transmitted from the transmitter 1. The data reading part 24 determines correspondence of the fixed code, and compares an addition code added by a receiving number adding part 25 with the variable code for determining if they are the ones to be received or not. When the variable code and the addition code are different from each other, the addition code by the receiving number adding part 25 is renewed corresponding to the variable code based on a predetermined action at the transmitter.

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 a car door, and more particularly to a transmitting/receiving device capable of dealing with theft.

0002

2. Description of the Related Art Some transmitting/receiving devices have a security function with a specific I/D code. One example is a transmitting/receiving device for remote control of a car. In this method, the user of the car carries a transmitter, and the transmitter sends transmission data with a unique I/D code added to the car. A receiver installed in the vehicle has a function of determining the I/D code, and when it is determined that the I/D code is a unique I/D code, executes the command included in the transmitted data. This execution includes, for example, automatically unlocking a car door, automatically turning on interior lights and headlights, etc.

0003

When a transmitting/receiving device using the above-mentioned specific I/D code is used, there is a risk that, for example, the owner of a car may drop the transmitter or the transmitter may be stolen. Someone with a found or stolen transmitter can, for example, send a message to multiple cars lined up in a parking lot in order to find the car that is compatible with the transmitter and unlock the car door. etc. will be possible.

[0004] The present invention solves the above-mentioned conventional problems, and provides a transmitting/receiving device that improves security functions by preventing the transmitter from necessarily becoming ready to receive when someone else has the transmitter. is intended to provide.

[0005]

[Means for Solving the Problems] A transmitting/receiving device according to the present invention includes an operating section, a fixed code, a variable code corresponding to the number of operations of the operating section, and transmission data that forms transmission data in a transmitter. A data generation section, a modulation section that modulates the data, and a transmission section that transmits the data are provided,
The receiver includes a receiving section that receives the transmission data transmitted from the transmitter, a demodulation section that demodulates the received data,
a data decoding section, the data decoding section judges whether or not the data is acceptable to receive from the fixed code and the variable code, and when the variable code and the number of receptions are different, the transmitter This feature is characterized in that the code for the number of reception times is updated in a jump based on a predetermined operation in accordance with the variable code.

[0006]

[Operation] In the above means, the transmitter transmits data including a variable code corresponding to the number of operations, and the receiver accepts the transmitted data when the fixed code matches and the variable code and the number of receptions match. Therefore, for example, when another person operates the transmitter several times and then transmits data to the receiver, the variable code and the number of receptions do not match, and the transmitted data will not be accepted. However, if the owner accidentally operates the transmitter several times and then sends a message to the receiver, the number of receptions on the receiver is updated by a predetermined operation, and data reception is accepted. This given operation is
For example, when the first transmission data is not accepted by the receiver, the transmission data is transmitted a predetermined number of times, for example, three times in a row, and this operation causes the receiver to accept the transmission data.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a circuit block diagram showing a transmitting/receiving device according to the present invention, in which (A) shows the configuration of a transmitter and (B) shows the configuration of a receiver. This transmitting/receiving device is shown as an example of one used in a remote control device for an automobile. As shown in FIG. 1(A), the transmitter 1 includes a key operation section 11 and a data generation section 12 that generates transmission data. In this data generation unit 12, as shown in FIG. 2, a unique I/D code (a), a variable code (b),
Serial transmission data in which command data (c) is lined up is formed.

The unique I/D code (a) is shown in FIG.
The code is stored in the I/D code memory 13 shown in FIG. This unique I/D code (a) can also be formed by mounting a diode at an arbitrary position on the matrix circuit. The variable code (b) is generated by the variable code addition section 14. In this variable code addition section 14, the number of operations of the key operation section 11 is added, and "01", "02", "
03''... variable data is generated.

Furthermore, the data generation section 12 includes a key operation section 1.
Command data (corresponding to the predetermined command information operated in step 1)
It has a function of storing c) and a function of selecting the corresponding command data. Then, the data generation unit 12 generates serial transmission data shown in FIG. 2 in which a unique I/D code (a) and a variable code (b) are added before the selected predetermined command data (c). be done. Data generation section 12
A modulating section 15 and a transmitting section 16 are provided at the next stage. The transmission data shown in FIG. 2 generated in the data generation section 12 is subjected to FM modulation etc. by the modulation section 15, and the transmission data shown in FIG.
6 from the antenna 17.

The receiver 2 shown in FIG. 1B is provided with a receiving section 22 that receives transmission data from an antenna 21, and a demodulating section 23 that demodulates the received data. At the next stage of the demodulation section 23, a data decoding section 24, a reception number addition section 25, and an I/D code memory 26 are provided.

The I/D code memory 26 stores the same unique I/D code as that stored in the I/D code memory 13 of the transmitter 1. This I/D code memory 26 can also be constructed by mounting diodes in a matrix circuit. In the reception number addition section 25, the data decoding section 24 extracts the I/D code and I/D code of the received data.
When it is determined that the I/D code stored in the /D code memory 26 matches, the number of receptions changes to "01" and "
02", "03", etc. are added.

The data decoder 24 compares the unique I/D code (a) shown in FIG. 2 among the received and demodulated data with the I/D code stored in the I/D code memory 26. , and the variable code (code corresponding to the number of transmissions by the transmitter) (b) shown in FIG. 2 is compared with the code of the number of receptions added by the number of receptions adding section 25. When both codes match, this data is accepted, the operation corresponding to the command data (c) shown in FIG. 2 is recognized, and a predetermined drive command is issued to the drive unit 27. The drive unit 27 uses a drive mechanism such as a solenoid, a motor, or a switch to unlock the doors of the car, turn on the interior lights, etc.
Headlights are turned on, etc.

Next, when the transmission data is received, the data decoding unit 24 determines that the unique I/D code (a) matches, but the variable code (b) and the addition added to the reception number addition unit 25 When it is determined that the codes do not match, the data is accepted when it is determined that the same transmission data has been received a predetermined number of times, for example, three times in a row. Data reception at this time is performed by jumping up the number of additions by the reception number adding section 25 in accordance with the variable code of the transmitter 1.

Of the above-described transmission and reception operations by the transmitter 1 and receiver 2, code decoding in particular will be explained in more detail with reference to FIG. I/D code memory 1 of transmitter 1
The unique I/D code (a) stored in 3 is “123
33". When transmitting for the first time, the variable code addition unit 14 inputs “0” by operating the key operation unit 11 of the transmitter 1.
1'' variable code (b) is formed. Data generation section 1
2, the unique I/D code (a) of the above “12333”
Next, a variable code (b) of "01" is added, and operation command data (c) is added to form the transmission data shown in FIG. 2, which is transmitted from the antenna 17.

In the receiver 2, transmission data is received by a receiving section 22, demodulated by a demodulating section 23, and sent to a data decoding section 24. In this case, the transmitted unique I/D code and the I/D code stored in the I/D code memory 26 are both "12333" and match, and since this is the first reception, the reception number addition unit 25 An addition code of "01" is formed. Therefore, the I/D codes match, and the variable code (b) and the addition code of the reception number adding unit 25 are both "01" and match, so the data is accepted. The command data (c) is then decoded by the data decoding section 24, and a predetermined drive command is issued to the driving section 27.

Next, when the second transmission is performed from the receiver 1 to the transmitter 2, the variable code addition section 14 of the transmitter 1 adds the variable code once, and the variable code becomes "02". When this data is received by the receiver 2, the data decoder 24 uses the I/D
Since the codes match, the number of receptions adding section 25 adds one time, and an addition code of "02" is formed. Therefore, in this case, both the variable code (b) and the addition code are "
02'' and therefore the transmission data is accepted by the receiver 2.

Next, if the transmitter falls into the hands of another person,
Suppose that it is used seven times toward the receiver of another car. If the transmission is then performed toward a car equipped with the receiver 2 corresponding to the transmitter 1, the variable code added by the variable code addition section 14 at this time becomes "10". On the other hand, the data decoding unit 24 on the receiver 2 side determines that the I/D codes match, so the reception count adding unit 24 determines that the I/D codes match.
5 is added once, and an addition code of "03" is formed. Therefore, in the data decoding unit 24, although the I/D codes match, the variable code "10" and the addition code "03"
refuse to accept the data because it does not match.

However, assume that the transmitter is operated by the original owner for the 10th time. In this case, the same operation of the transmitter 1 is repeated three times in succession. At this time, in the data decoding unit 24 of the receiver 2, at the first operation (the 10th operation), the sent variable code is “10”, and the added data in the reception number adding unit 25 is “03”. Therefore,
Refuse reception. When the same transmission is performed the next time (the number of operations is the 11th time), the data decoder 24 similarly refuses to receive the data, but the received variable data is "11".
Recognize that. However, the addition code in the reception count addition section 25 at this point is "04". When the same transmission is performed one more time in a row (the number of operations is the 12th time), the above "11" is sent by a command from the data decoder 24.
The number of additions by the reception number adding unit 25 is jumped up to 12 based on the variable code of "12", thereby generating an addition code of "12". Therefore, at this time, the data decoding section 24
It is determined that the D code matches, and that the variable code and the addition code in the reception number addition section 25 are both "12" and match, and the data is accepted and a predetermined operation command is sent to the drive section 27.
emanates from.

As shown at the 10th operation in FIG. 3, if the sent variable code and the addition code in the reception number adding section 25 do not match, the conditions for jumping up the addition code must be set. Instead of three consecutive operations, it may be four consecutive operations or more. Alternatively, as a condition for jumping up the addition code, it is not necessarily necessary to repeat the same transmission operation continuously; for example, when transmission data is not accepted by the tenth operation in FIG. 3, a predetermined operation,
For example, by simultaneously operating multiple keys on the key operation unit 11 of the transmitter 1, jump-up data is added before the command data (c), and when this data is received, the 11th operation The number of additions by the reception number addition section 25 may be jumped up to "11".

Furthermore, the transmitting/receiving device according to the present invention is not limited to use in automobile remote control devices, but can be used in other devices requiring security functions, such as garage opening/closing remote control devices.

[0021]

According to the present invention described in detail above, if the transmitter is used by another person, operated at another location, and then transmitted to the receiver, the transmitted data will not be accepted.
Security functions can be improved. Further, in the case of the original user, the addition code can be jumped up by a predetermined operation, so that there is no problem in regular use.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of a transmitting/receiving device according to the present invention, in which (A) is a transmitter and (B) is a receiver.

FIG. 2 is an explanatory diagram showing the structure of transmission data.

FIG. 3 is an explanatory diagram showing the relationship between the number of transmissions and data reception acceptance.

[Explanation of symbols]

1 Transmitter 2 Receiver 11 Key operation section 12 Data generation section 13 I/D code memory, 14 Variable code addition section 15 Modulation section 16 Transmission section 22 Receiving section 23 Demodulation section 24 Data decoding section 25 Reception count addition unit 26 I/D code memory 27 Drive section

Claims (1)

[Claims] 1. The transmitter includes an operating section, a data generating section that forms transmission data consisting of a fixed code, a variable code corresponding to the number of operations of the operating section, and transmission information, and a modulator that modulates this data. The receiver includes a receiver that receives the transmission data transmitted from the transmitter, a demodulator that demodulates the received data, and a data decoder. The data decoding unit determines whether the data is acceptable to receive from the fixed code and the variable code, and performs a predetermined operation in the transmitter when the variable code and the number of receptions are different. A transmitting/receiving device characterized in that a code for the number of times of reception is updated in accordance with a variable code based on the above.