JPH07131859A - Remote control unit - Google Patents

Abstract

PURPOSE:To prevent mischief by a third party and burglar by the interception and analysis of a remote control signal. CONSTITUTION:A remote control radio wave is transmitted from a hand operation unit 1, then the wave is received by the receiving antenna 15 of a remote control receiver 10 and the received signal is outputted from a receiving circuit 16. At this time, a reception detecting circuit 28 detects the reception of the remote control radio wave, so a security controller 20 controls a transmitting circuit 13 immediately to send a disturbing signal, which is generated by a disturbing signal generating circuit 11 and digitally modulated by a modulating circuit 12, from a transmitting antenna 14, thereby preventing the remote control radio wave from being intercepted and analyzed. For the received signal, a disturbing signal canceling circuit 17 reduces the output of the modulating circuit 12 to obtain an original remote control signal after digital modulation, and the signal is demodulated by a demodulating circuit 18 and then inputted to the security controller 20 through a synchronous detecting and code reading circuit 19, thereby performing specific operation corresponding to the remote control signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control device, and in particular, in a remote control type security system or the like, it is possible to prevent the remote control signal from being tampered with by another person by interception and analysis, or from being damaged by theft or the like. The present invention relates to a remote control device.

[0002]

2. Description of the Related Art In recent years, there have been frequent mischiefs and thefts of vehicles due to the deterioration of public safety, and car security systems for countering this have been rapidly spread. In the car security system, when the driver gets out of the vehicle and closes the door and presses the arm button of the handheld device, the handheld device digitally controls the carrier wave with a digital remote control signal including an ID code and a command code related to an arming command. Emits a modulated radio wave. The radio waves are caught by an antenna installed at a predetermined location on the vehicle,
After being input to the remote control receiver, received and demodulated,
The received ID code is registered in the remote control receiver in advance.
If it matches with the D code, and if it matches, the command is arming, so the arming state is entered and the door lock control is performed on the door lock device, and the outputs of various sensors such as motion sensors, shock sensors, and glass sensors are monitored. .

During arming, for example, when the motion sensor detects the movement of the vehicle, the remote control receiver drives the siren and controls the flashing of the headlamp to exterminate the bandits. When the driver returning to the vehicle presses the disarm button of the hand-held operating device, the hand-held operating device emits a radio wave in which the carrier wave is digitally modulated by a digital remote control signal including an ID code, a command code related to the disarming instruction, and the like. The radio waves are caught by an antenna installed at a predetermined location in the vehicle, input to the remote control receiver, received and demodulated, and then it is checked whether the received ID code matches the ID code registered in advance in the remote control receiver. , When they match, the command is disarming, so the arming state is released, the door unlock control is performed for the door lock device, and the siren or the headlamp is blinking until then. Stop.

As described above, in the car security system, in addition to the convenience that the door can be locked and unlocked by operating the remote control, the bandits try to pull the vehicle, the body is destroyed with a hammer or the like, and the glass is used. It has an excellent function that can alert you when you try to defeat.

[0005]

However, while many vehicles equipped with a car security system are luxury vehicles, the vehicles are always parked in the same parking lot such as a home parking lot or a neighborhood rental parking lot. It was intercepted and analyzed, and the same signal was transmitted, the arming state was released, and there was a risk of being mischievous or being stolen. From the above, it is an object of the present invention to provide a remote control device capable of preventing the mischief of another person by interception and analysis of a remote control signal, the occurrence of a theft case, and the like.

[0006]

SUMMARY OF THE INVENTION In the present invention, the above object is to provide a remote control receiver with interference signal generating means for generating a predetermined interference signal, transmission means for transmitting the interference signal to the outside, and interference from the received signal. This is achieved by providing interfering signal canceling means for subtracting the signal to obtain the original remote control signal.

[0007]

According to the present invention, the remote control receiver generates an interfering signal and transmits it to the outside, while reducing the interfering signal with respect to the received signal to reproduce the original remote control signal, and a predetermined remote control signal corresponding to the remote control signal. The operation of. As a result, even if another person intercepts and analyzes the remote control signal, the interfering signal is combined, so that accurate analysis cannot be performed, and it is possible to prevent the occurrence of mischief or theft.

Further, the remote control receiver is provided with detection means for detecting reception of the remote control signal, and the transmission means transmits the interference signal when the detection means detects reception of the remote control signal. With this, since the interference signal is transmitted only when the remote control signal is received, the risk of the interference signal being analyzed can be reduced, and the power required to transmit the interference signal can be saved.

By reducing the periodicity of the interfering signal, it is possible to reduce the risk that the interfering signal will be analyzed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram of a car security system according to an embodiment of the present invention. In the figure, reference numeral 1 is a hand-operated device, 2 is an operation unit having arm buttons 2a and disarm buttons 2b, 3 is a remote control signal generation circuit of a microcomputer configuration, and a digital remote controller according to an operation on the operation unit 2 Generate a signal. Reference numeral 4 is a modulation circuit for digitally modulating a carrier wave based on a digital remote control signal by a predetermined modulation method such as FSK modulation. Reference numeral 5 is a transmission circuit for performing frequency conversion or power amplification of the modulated signal,
Reference numeral 6 is a transmission antenna connected to the output side of the transmission circuit 5.

Reference numeral 10 is a remote control receiver installed in the vehicle, 11 is an interfering signal generating circuit for generating a binary random signal such as an M-sequence code as an interfering signal, and 12 is the same modulating system as the modulating circuit 4 for the interfering signal. Is a modulation circuit for digitally modulating the signal, and 13 is a transmission circuit that frequency-converts the modulated signal and amplifies the power, and performs a transmission operation only at a predetermined time under the control of a security controller described later. Reference numeral 14 is a transmission antenna connected to the output side of the transmission circuit 13.

Reference numeral 15 is a receiving antenna for catching remote control radio waves transmitted from the hand-held controller 1, 16 is a receiving circuit for performing high frequency amplification and frequency conversion of the received signal at the receiving antenna 11, and 17 is a received signal of the receiving circuit. An interference signal cancel circuit composed of a subtractor for subtracting the output of the modulation circuit 12 from the output to reproduce the signal related to the original digital remote control signal, and 18 is the modulation circuit 4 for modulating the output of the interference signal cancellation circuit. A demodulation circuit that demodulates with a demodulation method corresponding to the method, 19 is a synchronization detection / code reading circuit that performs synchronization detection and code reading on the output of the demodulation circuit,
20 is based on the output of the sync detection / code reading circuit,
A security controller of a microcomputer configuration for performing a predetermined security operation, 21 a door sensor for detecting the open / closed state of the door, 22 a door lock device, 23 a siren drive circuit, 24 a head lamp blinking circuit, 25 a motion sensor, 26 a shock The sensor 27 is a glass sensor (which detects that the glass is broken).

Reference numeral 28 denotes a reception detection circuit for detecting that remote control radio waves have been received from the reception signal output of the reception circuit. When the security controller 20 receives the reception detection signal, it immediately controls the transmission circuit 13 to start the transmission operation. After being started, when a predetermined fixed time (time required to complete reception of the remote control signal) elapses, the transmission circuit 13 is controlled to stop the transmission operation.

FIG. 2 is an explanatory view showing the data format of the digital remote control signal. The idling data,
Frame synchronization data, ID code, command code 4
It is composed of two. The reception detection circuit 28 immediately outputs a reception detection signal when the idling data starts to be received. The ID code is assigned to each vehicle, and the security controller 20 stores the ID code previously assigned to itself in the built-in memory, and the ID code received from the handheld controller 1 matches the prestored ID code. Only in such a case, a predetermined process corresponding to the command code is executed.

FIG. 3 is a flowchart showing the operation of the security controller 20, and FIG. 4 is a waveform diagram showing the operation of the interference signal cancel circuit 17, which will be described below with reference to these figures. When the driver presses the arm button 2a or disarm button 2b of the handheld controller 1, the remote control signal generation circuit 3 generates a digital remote control signal including a predetermined ID code and a command code related to the arm command or the disarm command. . The digital remote controller signal is digitally modulated by the modulator circuit 4, frequency-converted and power-amplified by the transmitter circuit 5, and emitted from the transmitter antenna 6 as a remote controller radio wave. The remote control radio wave is received by the receiving antenna 15 mounted on the vehicle and is received by the receiving circuit 16
High frequency amplification and frequency conversion are performed. At this time, the reception detection circuit 28 that receives the reception output of the reception circuit 16 outputs a reception detection signal to the security controller 20. The security controller 20 that receives the reception detection signal controls the transmission circuit 13 to perform the transmission operation for a fixed time (steps 101 or 111, 102 in FIG. 3).

The interfering signal generating circuit 11 previously generates a binary random signal as an interfering signal, and the interfering signal is digitally modulated by the modulating circuit 12 and then the transmitting circuit 13
Has been output to. When the transmission circuit 13 becomes operational,
Frequency conversion and power amplification of the digitally modulated interfering signal are performed, and the interfering signal radio wave is emitted from the transmitting antenna 14 to the outside. Therefore, in the space around the vehicle, the remote control radio wave and the interfering signal radio wave are combined, so that a bandit cannot intercept and analyze the remote control radio wave.

On the other hand, the received signal after being received by the receiving antenna 15 and subjected to high frequency amplification and frequency conversion by the receiving circuit 16 is also in a form in which the digital remote control signal after digital modulation and the interfering signal are combined. , It is necessary to remove the interfering signal (digitally modulated). Receiver circuit 16
The received signal output from the interference signal cancel circuit 17
Thus, the output of the modulation circuit 12 is subtracted, and only the original digital remote control signal (digitally modulated) is taken out (see FIG. 4). The digital remote control signal after digital modulation output from the interference signal cancel circuit 17 is digitally demodulated by the demodulation circuit 18, and then the synchronization detection / code reading circuit 19 performs synchronization detection and code reading, and is input to the security controller 20. It

The security controller 20 which has input the ID code and the command code checks whether the input ID code matches the previously stored ID code (step 103). If they match, if the command code is an arm command, then Up to the disarm state and the door sensor 21 detects that the door is closed, the arm state is set, and the door lock device 22 is controlled to lock the door (steps 104 to 107). In the arm state, the motion sensor 25 and the shock sensor 2
6. Each sensor output of the glass sensor 27 is monitored (step 108). For example, when the motion sensor 25 detects the movement of the vehicle, the siren drive circuit 23 is controlled to generate siren and the headlamp blinking circuit 2
An alarm is issued by controlling 4 and blinking the headlamp to exterminate the bandits (steps 109 and 110).

On the contrary, if the command code is the disarm command, the arm is in the disarm state on condition that it is in the disarm state until then, and the door lock device 22 is controlled to unlock the door (step 112, 113),
Further, when the siren is sounding or the headlamp is blinking, the siren drive circuit 23 is controlled to stop the generation of the siren, and the headlamp blinking circuit 2
4 to turn off the headlamp (step 11
4, 115).

Note that the security controller 20 controls the transmission circuit 13 to stop the transmission operation after a lapse of a predetermined time (after the reception of the command code) after the reception detection signal is input (step 102). As a result, the power consumption of the transmission circuit 13 can be suppressed to the necessary minimum.

According to this embodiment, the remote control receiver 10
While transmitting the interfering signal to the outside, the interfering signal is subtracted from the received signal to restore the original digital remote control signal, and the predetermined operation according to the digital remote control signal is performed. Even if an attempt is made to intercept and analyze a radio wave, the interference signal is combined, so that an accurate analysis cannot be performed, and it is possible to prevent the occurrence of mischief or theft. Further, the remote control receiver 10 is provided with a reception detection circuit 28 for detecting the reception of the remote control signal, and the transmission circuit 13 transmits the interfering signal only when the reception of the remote control signal is detected. With this, since the interference signal is transmitted only when the remote control signal is received, the risk of the interference signal being analyzed can be reduced, and the power required to transmit the interference signal can be saved. Further, since the disturbing signal is a binary random signal such as an M-sequence code, the periodicity is extremely small, and each time a remote control signal is received,
Different disturbing signals can be emitted, which also reduces the risk of the disturbing signal being analyzed.

In the above embodiment, the interference signal is transmitted only when the reception of the remote control signal is detected, but the interference signal may be transmitted at all times.
Further, although the car security system is taken as an example, it may be applied to a keyless device that only locks / unlocks the door by remote control operation, or may be applied to an office or home security system or other systems.

[0023]

As described above, according to the present invention, the remote control receiver generates an interference signal and transmits it to the outside, while reducing the interference signal with respect to the received signal to reproduce the original remote control signal,
Since it is configured to perform a predetermined operation according to the remote control signal, even if another person intercepts and analyzes the remote control signal, the interference signal is synthesized and accurate analysis cannot be performed, resulting in a mischief or theft. Occurrence can be prevented.

Further, the remote control receiver is provided with detection means for detecting the reception of the remote control signal, and the transmission means is configured to transmit the interference signal when the detection means detects the reception of the remote control signal. Since the remote control signal is transmitted only when the remote control signal is received, the risk of the interference signal being analyzed can be reduced, and the power required for transmitting the interference signal can be saved.

By reducing the periodicity of the interfering signal, the risk of the interfering signal being analyzed can be reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a car security system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a data format of a digital remote control signal.

FIG. 3 is a flowchart showing the operation of the security controller.

FIG. 4 is a waveform diagram showing the operation of the interference signal cancel circuit.

[Explanation of symbols]

 1 Handheld Controller 10 Remote Control Receiver 11 Interference Signal Generation Circuit 12 Modulation Circuit 13 Transmission Circuit 14 Transmission Antenna 15 Reception Antenna 16 Reception Circuit 17 Interference Signal Cancellation Circuit 18 Demodulation Circuit 20 Security Controller

Claims (3)

[Claims] 1. A remote control device comprising: a hand-operated device that wirelessly transmits an operation signal; and a remote-control receiver that receives a remote-control signal transmitted from the hand-operated device and performs a predetermined operation according to the remote-control signal. The receiver is provided with an interference signal generating means for generating a predetermined interference signal, a transmitting means for transmitting the interference signal to the outside, and an interference signal canceling means for subtracting the interference signal from the received signal to obtain the original remote control signal. A remote control device characterized in that 2. The remote control receiver is provided with detection means for detecting reception of a remote control signal, and the transmission means is adapted to transmit an interference signal when the detection means detects reception of the remote control signal. The remote control device according to claim 1. 3. The remote control device according to claim 1, wherein the interfering signal generating means is configured to generate an interfering signal having low periodicity.