JPS59128832A - Electronic circuit device - Google Patents

Abstract

PURPOSE:To prevent removal of an electronic device for mounting on a car by collating a password code given in correspondence to application of power supply witha password code given in an electronic equipment in advance and releasing the inhibition of an operating state inhibiting circuit only when they are coincident with each other. CONSTITUTION:In installing the electronic circuit device on a passenger car or the like, the FM receiving mode is set and an optional specific tuning frequency is selected by the display on a display 21 and numeric information corresponding to the tuning frequency is stored in a control section 16 by key operation from a control section 19. Further, a numeral corresponding to a password code is displayed on the display 21 at application of power supply and the code is collated with a password code stored in advance. As a result, so long as the codes are not coincident correctly, the control section 16 keeps a sound output inhibiting circuit in the inhibiting state. It password code input mistakes exceeding, e.g., 10 times, occur, the inhibiting state is not released so long as a reset circuit 23 known to a personnel who has a special authority is not operated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electronic circuit device, particularly an electronic circuit device including a radio, a recording/playback device, etc. installed in a passenger car, in which a PIN code is detected when the power is turned on under special circumstances. The present invention relates to an electronic circuit device that can shift to a normal operating state only when the two conditions match.

Although the present invention is not limited thereto, it may happen that an electronic circuit device installed in a passenger car or the like is removed from the passenger car. In order to prevent such a case from occurring, it is conceivable to incorporate an operating state prohibition function that allows the normal operating state to be entered only when a predetermined password code is verified. However, the problem is how to input such a password.

An object of the present invention is to provide an electronic circuit device that solves this problem.1 For example, the above-mentioned password is input using a channel selection means in an FM receiver, and the device can be operated under undesired driving conditions. An electronic circuit device is provided that inhibits a state. This will be explained below with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the processing mode of the embodiment of the control section shown in FIG. 1.

In FIG. 1, 1 is an antenna, 2 is a high frequency amplification circuit,
3 is a mixer circuit, 4 is a voltage controlled oscillator in a PLL circuit and corresponds to a local oscillator, 5 is an intermediate frequency amplifier circuit, and 6 is a detection circuit.

7 is a stereo separation circuit, 8 is an audio output prohibition circuit prepared in the present invention and corresponds to the driving state prohibition circuit according to the present invention, 9 is an output amplification circuit, 10.11 is a speaker, and 12. 13 are magnetic heads, 14.1
5 is an equalization amplifier circuit.

Reference numeral 16 denotes a controller unit that performs tuning control of a PLL synthesizer radio, 17 a low-pass filter that constitutes the PLL circuit, and 18 a prescaler that extracts the tuning frequency of FM reception in the illustrated case. , 19 is a control input section used for inputting a password code, etc., and 20 is a display for display.
driver.

21 is a display which numerically displays, for example, the FMM tone frequency; 22 is a memory backup power supply for securing power to the memory for the password code etc. held in the control unit 16; The vehicle 10B power supply represents the power supply of a passenger car or the like.

Assuming that the audio output inhibiting circuit 8 is in the "non-inhibited" state in normal operating conditions, the broadcast waves from the antenna 1 are transmitted through the circuit elements 2.3, 4, 5, 6.7.8 (non-inhibited) as conventionally known. prohibited state), received by 9.10.11 and speaker 1
0.11, it is output as audio output. In addition, the heads 12, 13 . amplifier 1
The output from 4.15 is outputted by the speaker 10.11 to the audio output inhibition circuit 8 which is in the non-inhibited state.

Under normal operating conditions, it operates as described above, but for example, in a set for Europe, the FM tuning wave number is configured to be displayed on the display 21 as a six-digit number when receiving FM. ing. That is, when the output frequency of the voltage-controlled oscillator 4 is controlled by the control unit 16, the frequency that is in the tuning state at that time is picked up by the prescaler 18, and the control unit 16 controls the driver 20 to set the tuned frequency. is configured to display numerically on the display 21.

In the case of the present invention, as an example, the display 21
Focusing on the existence of a tuned frequency display function,
It is used to enter the PIN code mentioned above.

In other words, when the electronic circuit device is installed,
First, set to the FMM transmission mode, select an arbitrary specific tuned frequency on the display 21, and input numerical information corresponding to the tuned frequency into the control section 16 by key operation from the control input section 19. Make it memorable. It should be noted that for inputting the personal identification code using the numerical display of the tuning frequency, about 680 numbers, for example 9, can be given, which can be considered to be a number that does not cause any problem in practice.

As mentioned above, once the PIN code has been memorized, the number corresponding to the PIN code will be displayed on the display 21 when the power is turned on, for example, under special operating conditions as explained with reference to FIG. Unless the PIN code is correctly verified with the previously stored PIN code, the P-R section 16 will keep the audio output inhibiting circuit shown in FIG. 1 in the inhibited state. Ru. This prohibited state can be canceled if the password is entered incorrectly within the range of, for example, 10 times, but if the password is entered incorrectly more than 10 times, only a person with special authority can do so. Unless the reset circuit 23 activates the process known to the user, that is, the reset function by the reset circuit 23, the prohibited state will not be resolved and the power will be turned off or the like.

FIG. 2 shows an embodiment of processing related to password input in the control unit.

When the power is turned on, in this state, if the PIN code is not stored in the device as described above.

Proceed to the illustrated route and store the password Fo in a form that corresponds to the predetermined tuning frequency as described above. At the time of memorization, rYES appears on the display 21.
J is displayed and 9 enters the normal operating state. That is, it is possible to operate it arbitrarily whether it is radio reception or recording/playback. If the power is turned off and then turned on again in this state, the following will occur. That is, this time it will proceed as shown in the route (B) shown in Figure 2, and under some circumstances it will be checked whether or not the power source J of vehicle 10B shown in Figure 1 is disconnected. With the device removed from the vehicle, it is checked whether it is being operated.Whether or not it is removed is determined by the fact that the control unit 16 receives energy from the backup power source 22 shown in FIG. 1
It is checked by using a switch or the like to determine whether there is a voltage at the INT shown in the figure and whether the electronic circuit device is installed at a predetermined equipment position on the passenger car, for example. If the "vehicle 10B power supply" is not disconnected, follow the route shown in the diagram (
You can proceed through step B) and enter the normal operating state.

However, if the "vehicle 10B power supply" was disconnected,
For example, the operator displays a specific tuning frequency on the display 21 in the same manner as above.

It becomes necessary to give a collation instruction from the control input section 19. In other words, proceed to the route shown in Figure 2 (C1). If the entered code F and the previous pin code FO match, the operating state returns to 1. However, if they do not match, the input must be repeated 10 times. If the input is not performed correctly, the electronic circuit device is rendered unusable by, for example, turning off the power.

As explained above, according to the present invention, the pin code can be input using the adjustable channel selection means.
There is no need to add a special input means for inputting the password. Although this point is not an essential requirement of the present invention, the case shown in Figure 1 and 2.

When installed in a vehicle, there is no need to enter the PIN code each time, so there is no inconvenience in using it, and there is less worry about theft.

Note that storing the above-mentioned PIN code, determining whether the device is installed on the vehicle, verifying the PIN code, and generating control output for the driving state prohibition circuit can be easily performed by simply incorporating an extremely small processor. It is possible.

[Brief explanation of the drawing]

FIG. 1 shows the configuration of an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the processing mode of an embodiment of the control section shown in FIG. 1. In the figure, 8 is an operation state prohibition circuit, 16 is a control section,
19 is a control input section, 21 is a display, 22
represents memory backup power supply. Patent applicant Alpine Co., Ltd.

Claims (1)

[Claims] In an electronic circuit device having an electronic circuit function including a receiver having an adjustable channel selection means and configured to transition to a normal operating state in response to power-on, the normal operating state of the electronic circuit device. It has a built-in operating state prohibition circuit that prohibits the operation, and is configured so that an arbitrary predetermined password code is input depending on the frequency tuning state of the tuning means. An electronic circuit device characterized in that the electronic circuit device is configured to check a password given in the circuit device and, if they match, cancel the prohibition process by the driving state prohibition circuit.