JP3011370B2 - Anti-theft system for car audio equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the prevention of theft of in-vehicle audio equipment.

<Prior Art> As a conventional technique, a system for preventing theft of an in-vehicle audio device at the time of removal is required, and a key must be input to a predetermined code to the audio device when the audio device is mounted again.

<Problem to be Solved by the Invention> When the in-vehicle audio device is removed or replaced, there is a possibility that the owner himself may have forgotten the predetermined code, and if the audio device is temporarily When the device is stolen, the normal operation can be performed once the setting code is unlocked, and there is a high possibility that the setting code is decoded.

<Means for Solving the Problems> A system for preventing theft of an in-vehicle audio device according to the present invention includes a remote controller for transmitting a command signal including a predetermined code, a receiving unit for receiving a command signal from the remote controller, and a first code. A first code setting unit for setting a predetermined code included in a command signal from the remote controller and a first code set by the first code setting unit. A first control unit that outputs a code, and operates only in response to the command signal if the first control unit matches the first control unit; and a predetermined release output from the first control unit. A communication line for transmitting a code, a second code setting unit for setting a second code, a predetermined release code input via the communication line, and the second code setting unit. A second comparison is performed to determine whether the second code matches the second code.
And an audio device that has a control unit and that can normally operate only when the power supply is cut off and the power is supplied again only when the power supply is matched by the second comparison.

<Operation> The anti-theft system for in-vehicle audio equipment of the present invention inputs a predetermined code to the audio equipment via the anti-theft device with a remote controller, and only when the input code matches a preset code, is the audio equipment. Operates normally.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes an in-vehicle anti-theft device, which comprises a tuner 8 for receiving radio waves, a first code setting unit 10 for setting a predetermined first code, and a microcomputer 9 constituting a first control unit for controlling them. . The microcomputer 9 has a function of activating the siren 16 when an abnormality is detected by the sensor 15 such as a motion sensor.

Reference numeral 2 denotes a remote controller for remotely controlling the in-vehicle antitheft device. The remote controller 2 includes an operation unit 4 for giving a key input instruction, a predetermined code setting unit 6, a transmission circuit 7 for transmitting radio waves of a predetermined code, and a control unit. It is composed of a microcomputer 5. The in-vehicle anti-theft device 1, the sensor 15, the siren 16, and the remote controller 2 constitute an in-vehicle anti-theft device.

Reference numeral 3 denotes an in-vehicle audio device, which is an in-vehicle radio receiver as an example in the drawing, and sets an operation unit 13 for instructing an operation, a radio reception unit 14, and a predetermined second code. It comprises a second code setting section 12 and a microcomputer 11 constituting a second control section for controlling these. In addition, this microcomputer 11 is a vehicle-installed anti-theft device 1
Via a communication line 20.
Reference numeral 17 denotes a vehicle power supply for supplying power to a microcomputer or the like, and reference numeral 19 denotes a speaker for outputting a reproduced audio signal of the radio reception unit 14. As described above, the anti-theft system for in-vehicle audio equipment according to the present invention is mainly composed of the in-vehicle anti-theft apparatus including the in-vehicle anti-theft apparatus main body 1 and the remote controller 2 and the in-vehicle audio equipment 3. .

Next, the operation of the anti-theft system for in-vehicle audio equipment according to the present invention will be described.

When the car audio equipment 3 is removed from the installation position in the car, the line 18 from the power supply 17 is cut off, and then the car audio equipment 3 is reconnected and the power is supplied, the microcomputer 11 is set in the code setting unit 12 of the car audio equipment 3 in advance. The setting is made so that the in-vehicle audio device 3 is not brought into a normal operation state unless a predetermined release code matching the second code is input from the outside. Therefore, to bring the in-vehicle audio device 3 into a normal operation state with the power supply line connected again, the following is performed. First, the operation unit 4 of the remote controller 2
When a key operation is performed, the microcomputer 5 detects the instruction and transmits a command signal including a predetermined code set in the code setting unit 6 as a radio wave via the transmission circuit 7. The tuner 8 of the in-vehicle anti-theft device 1 receives the radio wave, and the microcomputer 9 compares the first code set in the code setting unit 10 with a predetermined code included in the received command signal, and when they match, Only the in-vehicle anti-theft device 1 is operated in response to a command signal. If they match, the microcomputer 9 is the microcomputer of the on-vehicle audio device 3.
A signal representing a predetermined release code is sent to the communication line 11 via the communication line 20. Code setting unit 12 for in-vehicle audio equipment 3
The microcomputer 11 compares whether or not the second code set in advance with the code signal sent from the microcomputer 9 of the antitheft device main unit 1 matches. The microcomputer 11 operates the operation unit 13 and the radio only when the codes match. Enable normal operation of 14 mag. Therefore, if they do not match, no normal operation is performed. As described above, the anti-theft system for in-vehicle audio equipment according to the present invention enables the anti-theft function of the in-vehicle audio equipment to be easily performed using the remote controller constituting the security system.

Note that the predetermined code for matching may be a separate code or the same code for the remote control 2 and the in-vehicle anti-theft device 1, and the in-vehicle anti-theft device 1 and the in-vehicle audio device 3.

<Effects of the Invention> According to the anti-theft system for in-vehicle audio equipment of the present invention, when the power supply is cut off and the power is supplied again, the in-vehicle audio equipment alone cannot operate normally. The anti-theft effect is great. Furthermore, since the release code input for normal operation of the in-vehicle audio device is automatically input from the anti-theft device to the in-vehicle audio device by operating the remote control, the user needs to store the release code as in the past. And the normal operation of the in-vehicle audio device can be easily performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1 ... theft prevention device for vehicle, 2 ... remote control, 3 ...
... audio equipment for vehicles, 15 ... sensors, 16 ... sirens.

Claims (1)

(57) [Claims] A remote controller for transmitting a command signal including a predetermined code; a receiving unit for receiving a command signal from the remote controller; a first code setting unit for setting a first code; A first control unit that performs a first comparison between the included predetermined code and the first code set by the first code setting unit and outputs a predetermined release code when they match, and An anti-theft device that operates in response to the command signal only when the two match, a communication line for transmitting a predetermined release code output from the first control unit, and a second code for setting a second code A second code setting unit, and a second control unit that performs a second comparison as to whether a predetermined release code input via the communication line matches the second code set by the second code setting unit. An audio device capable of normal operation only when the power supply is cut off and the power supply is performed again and the power supply is again performed when the power supply is matched by the second comparison. Prevention system.