JP3199502B2 - Security system using external memory - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security system for preventing car audio from being stolen, and more particularly to a system which is simpler, less expensive, and reduces the burden on a user.

[0002]

2. Description of the Related Art As a technology in such a field, there is a security system for preventing theft of car audio which has been regarded as a problem in various countries in the world. In this security system, when a user has an arbitrary security code (number) and tries to reconnect to the power supply by a thief or the like when the audio body is disconnected from the power supply (battery) by theft, If the user cannot input a security code set arbitrarily, the security system is not released. Such stolen audio is made unusable even if it is simply connected to a power source, that is, the value of the audio is lost and security is increased.

[0003]

However, in the conventional security system, when the user disconnects the audio from the power supply, the trouble of inputting the security code and the mental burden of storing the code are required. There was a problem. On the other hand, there is a method of removing the car audio main body or the operation panel unit from the vehicle when the user leaves the vehicle, and carrying the user, but this method has a disadvantage that the user is heavy and bulky.

Accordingly, the present invention is simple in view of the above problems,
It is an object of the present invention to provide a security system that is inexpensive and can reduce the burden on the user.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an electronic apparatus having nonvolatile first storage means (last mode memory) for storing set values obtained by operating a plurality of sound sources. Car audio) , the second storage means
(Security memory) and a control unit . Said
The second storage means is a nonvolatile memory for storing the same contents as the first storage means, and is detachable.

The control unit determines whether the contents of the first storage means and the second storage means match when the power of the electronic device is turned on, and turns off the power if the contents do not match. is there. In place of the second storage means, a non-volatile memory storing a predetermined code and a removable third memory.
When the storage unit is attached, the control unit operates the third storage device.
Reads the specified code from the stage and compares it with the information stored in advance
And, erasing the memory contents of the if match the first storage means
I do .

[0007]

According to the security system using the external memory of the present invention, the second storage means is detachable and small, so that the portability is further improved. In comparison, the burden on the user is significantly reduced. When the power of the electronic device is turned on, it is determined whether or not the contents of the first storage means and the second storage means match, and if they do not match, the power is turned off, thereby ensuring security. Since the user does not need to store the security code as in the related art, the burden on the user can be greatly reduced. Note that the probability that the contents of the first storage means and the contents of the second storage means match each other is extremely small, and the power-off cannot be canceled even if the second storage means for another electronic device is substituted. As a result, the configuration is simplified and the price can be reduced. When a removable third storage unit, which is a non-volatile memory storing a predetermined cipher, is mounted instead of the second storage unit, the control unit reads the predetermined cipher from the third storage unit and If the information is equivalent to the stored information, by clearing the storage contents of the first storage means, the security can be released even if the second storage means is lost, and the use of the car audio can be resumed .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 security using external memory of the present invention - is a view showing an appearance of a system. As shown in this figure, a removable external
Molly 23 is provided .

FIG . 2 shows an external memory according to the present invention.
FIG. 2 is a block diagram showing a configuration of a security system 1.
You. Security system using external memory shown in this figure
The stem 1 includes a radio unit 11 for receiving and detecting a radio broadcast AM / FM, a cassette unit 12 including a plurality of sound sources such as a tape and a CD (Compact Disc), and a volume of the radio unit 11 and the cassette unit 12. An audio unit 13 for performing control, bass control, treble control, and the like; a power amplifier 14 provided at a subsequent stage of the audio unit; a speaker 15 driven by the power amplifier 14 to generate a reproduced sound; a radio unit 11 and a cassette unit 1
2, a power supply circuit 16 for supplying power to the audio unit 13 and the power amplifier 14, a power switch 17 for turning on and off the power supply circuit 16, an operation switch 18 for operating the radio unit 11 and the cassette unit, and an operation switch 18. A display unit 19 for displaying the operation contents; and a non-volatile last mode memory 20 for storing the last operation contents of the operation switch 18
And a switch 21 for connecting the radio unit 11 or the cassette unit 12 and the last mode memory 20 and setting the stored operation contents only when the power switch 17 is turned on, and a switch 22 for turning off the operation switch to form the security mode. Have.

[0010] The security using the external memory according to the present invention
The system 1 further includes a nonvolatile security memory 23 which can store and remove the final operation contents of the operation switch 18 like the last mode memory 20, a power switch 17, and a last mode memory 2.
0, if not satisfied entered predetermined condition information from the security memory 23 to the power supply circuit 16 to turn off, comprising a <br/> security-controlled unit 24 comprising a computer for performing a security process to be described later. Here, the switches 21 and 22 are controlled by the security control unit 24.

In the last mode memory 20 and the security memory 23, the contents of the operation switches immediately before the power is turned off after the user operates the audio, for example, as a sound source type, AM FM tape cassette, CD, etc., and as the preset contents of AM / FM, CH1: AM-558kHz, F
M-80.2MHz, CH2: AM-666kHz, F
M-85.1 MHz... Are written and updated. That is, when the power switch 17 is turned off, the same final contents are written in the last mode memory 20 and the security memory 23.

FIG. 3 shows switches 21 and 22 and power supply circuit 1.
6 is a diagram for explaining the operation relationship of FIG. FIG. 3A shows the on / off state of the power supply circuit 16. Normally, the power supply circuit 16 is turned on and off by a power switch 17. In FIG. 6B, when the power switch 17 is normally turned on from off , the switch 21 is connected to the output side of the last mode memory 20 for a fixed time so that the stored contents can be set in the radio unit 11 or the like. In FIG. 3C, when the power switch 17 is turned off, the switch 22 is opened, and a security mode is established in which the power cannot be continuously turned on unless certain conditions are satisfied. When the power switch 17 is turned on from off, the opening is continued for a certain time to make a security judgment. This is to prevent the contents of the last mode memory 20 and the security memory 23 from changing during the period of making this determination. If the security is determined to be normal, the switch 22 is closed and the security mode is released. Is done.

FIG . 4 is a flowchart for explaining the control operation of the security judgment in the security control section 24 of FIG. As shown in the figure, in step 1, the security control unit 24 determines that the power supply circuit 16 is in the power-off mode based on the OFF information of the power switch 17 as an initial state. In step 2, the security control unit 24 determines whether the power supply circuit 16 has been turned on based on the ON information of the power switch 17.

In step 3, when the power switch 17 is turned on, it is determined that the power circuit 16 is in the power-on mode. In step 4, security judgment is made as to whether the contents stored in the last mode memory 20 and the security memory 22 match. The probability of this match is very small because it depends on the contents of the last mode memory 20. If a match is stored contents of both in this mode it is determined that normal, it is judged that an abnormal if they do not match. If it is determined to be abnormal, the process returns to step 1 and the power supply circuit 16 is turned off by the security control unit 24 so as to switch from the power-on mode to the power-off mode.

In step 5, if it is determined in step 4 that the contents are the same and the contents are normal, the security mode is released. As a result, the switch 22 changes from open to closed. In step 6, the power-on mode is continued after the release. In step 7, an audio operation is performed by operating the operation switch 18.

In step 8, the security control unit 24 determines whether the power switch 17 has been turned off. If the determination is "NO", the process returns to step 6. Step 9
In step 8, if the determination in step 8 is "YES", the switch 22 is changed from closed to open so that the storage contents of the last mode memory 20 and the security memory 22 cannot be changed. Thereby (Step 1 to Step 4)
Until the security mode starts.

Therefore, according to the present embodiment, when the user leaves the vehicle, the security memory 21 is small.
The contents of the last mode memory can be removed even if the same security memory 22 of another vehicle is installed by removing
Because the audio system can not be used because it is different from
Simple and inexpensive security can be achieved, and the burden on the user can be reduced.

Next, if the user removes and loses the security memory 22, the car audio cannot be used. In this case, a clear memory 24 (see FIG. 2) capable of clearing the contents of the last mode memory 20 is stored at a car dealer or a manufacturer, and the user clears the last mode memory 20 at the car dealer or the like to provide security. The memory 22 can be newly refilled and put into a use state. Since the clearing memory 24 is stored in a car dealer or the like, security is assured.
The operation of the security control unit 23 using the clear memory 24 will be described below. Clear memory 2
4 stores a code, for example, a frequency that is not used for radio broadcasting. FIG. 5 is a flowchart for explaining the operation of clearing the last mode memory.

The operation shown in the figure is performed by the power switch 1 shown in FIG.
7 is performed before the operation at the time of turning on. In step 11, the security control unit 24 determines whether the power switch 17 is on. In step 12, the security controller 24 reads information from the security memory 23 when the power switch 17 is turned on. At that time if clearing memory over 24 instead of the security memory 23 is mounted, cleared for memory 24 outputs a predetermined frequency as an encryption. The security control unit 24 stores the corresponding predetermined frequency in a memory (not shown) in advance, compares the read frequency with the corresponding predetermined frequency, reads and determines whether or not they match.

In step 12 , the predetermined frequencies match.
If to determine "YES", and clears the last mode memory 20 by the security control unit 24 at step 13. Then, a new security memory 23 is mounted in place of the clear memory 25. Step 14
At, the process proceeds to step 9 in FIG. Step 12
If the determination is NO, the process proceeds directly to step 9 in FIG.

[0021] Thus, security memory 23 is due to the fact that the security memory 23 has become small
New, even if you lose your security memory 23
Will be exchangeable.

[0022]

As described above, according to the present invention, since the security memory is detachable and small in size, portability is further improved, the burden on the user can be remarkably reduced, and the last mode memory and the security memory can be connected when the power is turned on. By judging whether the contents match and turning off the power if they do not match, it is not necessary to memorize and enter the security code, so the burden on the user can be greatly reduced, the configuration can be simplified and the price can be reduced. The contents of the last mode memory can be cleared by a predetermined code, and the use of the car audio can be easily resumed even if the security memory is lost.

[Brief description of the drawings]

[1] security using external memory according to the present invention - is a diagram showing an appearance of an embodiment of the system.

FIG. 2 shows a security system using the external memory shown in FIG.
FIG. 2 is a block diagram showing a configuration of a stem 1 .

FIG. 3 is a diagram illustrating an operation relationship between switches 21 and 22 and a power supply circuit 16;

FIG. 4 is a flowchart illustrating a control operation of security determination in security control 24 of FIG. 2;

FIG. 5 is a flowchart illustrating an operation of clearing a last mode memory.

[Description of Signs] 1 ... Security system using external memory 11 ... Radio unit 12 ... Cassette unit 16 ... Power supply circuit 17 ... Power switch 18 ... Operation switch 20 ... Last mode memory 21,22 ... Switch 23 ... Security memory 24 security control unit 25 clear memory

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-295049 (JP, A) JP-A-4-233892 (JP, A) JP-A-4-276849 (JP, A) JP-A-2-2 299945 (JP, A) Japanese Utility Model 4-14548 (JP, U) Japanese Utility Model 2 132328 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08B 13/00-15 / 02 B60R 9/00-11/06 G11C 7/00

Claims (2)

(57) [Claims] A nonvolatile first storage unit for storing last mode information of the electronic device; a detachable nonvolatile second storage unit for storing last mode information of the electronic device; A security system using an external memory, comprising: control means for controlling security of the electronic device based on a comparison result of storage contents of the first storage means and the second storage means. 2. A non-volatile third storage means for storing a predetermined encryption, and when information equivalent to the previously stored encryption is input, the information is stored in the first storage means. 2. The security system according to claim 1, further comprising: an erasing unit for erasing information.