JPH01276396A - Burglar preventing device for on-vehicle audio equipment - Google Patents

Abstract

PURPOSE:To surely prevent the burglary of an audio equipment for a vehicle by preventing at least one use out of acoustic equipment when it is judged by a code comparing means that a code is not mutually in a prescribed relation. CONSTITUTION:Password codes are set to code setting parts 2a and 2b of respective pieces of acoustic equipment 1a and 1b combined as an audio system, when the audio system is used, these password codes are read, mutually compared, and when it is judged that as the result of comparison, a code is not mutually in a prescribed relation, the use of at least one of the pieces of the acoustic equipment 1a and 1b is prevented by a use preventing means 4. Consequently, when the stolen goods are included, the audio system does not perform a normal action and the situation to use the stolen goods is evaded. Thus, as the result, the burglary of the acoustic equipment can be prevented.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an anti-theft device for a vehicle audio system that combines a plurality of audio devices, and more specifically, the present invention relates to an anti-theft device for a vehicle audio system that combines a plurality of audio devices. The present invention relates to an audio theft prevention device for a vehicle that attempts to prevent theft of each audio device by disabling the use of the audio device.

(Prior Art) In recent years, vehicle audio systems have become rapidly popular, and it is known that they are based on radios and are combined with various audio equipment such as CD players, cassette decks, and even graphic equalizers.

These audio systems are of the fully equipped type, in which all the audio equipment is already installed when the vehicle is purchased, and the retrofit type, in which the owner of the vehicle finally adds and installs the missing audio equipment after purchasing the vehicle. There are things.

(Problem to be solved by the invention) However, as each audio device that makes up a vehicle audio system has become more expensive year by year as its functions have been enhanced, some foreign countries in particular are There are many countries where there is a high incidence of theft. In these countries, routes for buying and selling these stolen goods have actually been established.

Although such thefts can be prevented to some extent by the car owner's caution, it is difficult to be careful about people breaking into the car by breaking open the car lock, and it is difficult to prevent theft of audio equipment. It was difficult to prevent it.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a vehicle audio theft prevention device that can reliably prevent vehicle audio from being stolen.

(Means for Solving the Problems) The vehicle audio anti-theft device of the present invention includes at least two audio devices 1a and 1 constituting an audio system.
A password is set in the code setting sections 2a, 2b arranged inside each of the audio devices 1a, lb, and when these audio devices 1a, lb are combined with each other, the password set in each code setting section 2a, 2b is set. These codes are input to the code comparing means 3, and the code comparing means 3 compares whether or not these codes are in a predetermined relationship with each other, and as a result of this comparison, when it is determined that the codes are not in a predetermined relationship with each other, The present invention is characterized in that the use of at least one of the above-mentioned audio devices 1a and 1b is prevented by a use blocking means 4.

(Function) According to the above configuration, each audio device combined as an audio system 1. a, lb- code setting section 2a, 2
A password code is set in b, and when using the audio system, these password codes are read out and compared with each other. Each audio device for which the above PIN code has been set 1. a.1.
l] If the two pieces of equipment have been the same from the beginning, it is possible to set the password codes in a predetermined relationship, for example, to make them the same, but if one is stolen, the audio equipment and the audio equipment that have been owned from the beginning can be set. Usually, the password codes of stolen audio equipment do not match. Therefore, if the PIN code does not match, it can be determined that at least one of the audio devices is a stolen item. Based on this, if it is determined that the audio device contains stolen items, the use of at least one of the audio devices is prohibited. By disabling the audio system, it is possible to prevent the audio system from operating normally. If all vehicles were to be equipped with such a device, the situation of using stolen goods would be avoided, as those who use stolen goods would suffer damage due to the use of stolen goods, and as a result, the use of stolen goods would be avoided. Theft can be completely prevented.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the vehicle audio anti-theft device of the present invention. In Figure 2, the first
A radio 11 is shown as the first audio device, and a CD player 12 is shown as the second audio device, and these two audio devices constitute an audio system. The device of this embodiment determines whether the password codes of the radio 11 and the CD player 12 match or do not match, and if they do not match, the CD player 12 cannot be used. ROM 1.3.14 as a code setting section disposed inside; a CD control section 15 that reads the password code set in the ROM 1.4 and sends the code signal to the radio 1; Compare the code with the pin code set in ROM13, and if the pin codes match each other, the CD
Radio control unit 1 that sends an OK signal to the control unit 15
6. When the radio control unit 16 determines that the two codes do not match, the power supply relay 17 stops power supply to the radio controller 21 based on the command signal from the control unit 16, and the CD control unit 15 receives the above OK. It consists of a power supply relay 19 that stops power supply to the CD controller 18 based on the input of a command signal from the CD control section 15 when the double signal is not input. Further, as shown in FIG. 3, a nine-key keyboard 20 is arranged on the front panel of the radio of the audio system, and by operating this keyboard 20, a password code to the ROM 13, 14 is entered.
You can now set the code. In addition, in FIG. 3, the tape cassette deck 1.2a is arranged between the radio 11 and the CD player 12.
Regarding a, a CD similar to that of the CD player 12 described above is also used.
CD player 1 with built-in control unit 15 and ROM 14
It is possible to perform the theft prevention operation similar to 2.

The operation of the apparatus of this embodiment will be explained below using flowcharts and block diagrams. FIG. 4 shows a basic flowchart of radio theft prevention processing. According to this flowchart, first in step 100, it is determined whether the power flag is set (11?). be done. The power supply flag is set so that it is set if the power supply to the radio stops even once, and is left at 0 otherwise. Step 10
If it is determined that the power supply flag is not set at 0,
The power relay is in a conductive state (SILO), and the power supply voltage V
is read out (Si20), and it is determined whether the power supply voltage V is 0 or not (S130). As a result, if the value of the power supply voltage V is not 0, the process returns to the normal control routine and the power supply voltage V is determined. If the value is O, erase the flag (Si40
) Return to normal control routine. On the other hand, if it is determined in step 100 that the power flag is set, n or 0 is set as a routine meter (81, 50), and the code input operation from the 9 keyboard 20 on the front panel of the radio is not performed. SI[io), enter the password N entered from this keyboard 20 into the memory in the radio control unit 16 (5170), and at the same time, the ROM1
5180), and then input the above two codes N and N in step 190.

or compared. If these two codes N and No are equal, this radio is not stolen and step +1. O
If the two codes N and No are not equal, n is incremented (S200), and then an alarm signal is issued (S210). If the two codes do not match, please take into consideration that there may have been an input error, etc.
The mistake of pressing the wrong button is now forgivable (S
220). If the input code N does not match the code No three times in a row, the process advances to step 230 and waits at this position until a recovery signal is input. The recovery signal can only be entered at a dealer or other retail outlet, so if you are unable to enter the correct pin code for a radio or stolen item, the normal control routine will resume unless you take it to a dealer or other retail outlet. It is difficult to do so.

In this way, when using this radio, you will need to enter the PIN code into the ROMLS in advance and the key fob 2.
The radio is prevented from being stolen by disabling the use of the radio unless it is confirmed that the personal identification code entered manually from 0 matches.

Next, FIG. 5 shows a flowchart of a process for confirming the match between the password code set in the R2M 17 of the radio and the password code set in the ROM 14 of the CD player. According to this flowchart 1, first step 30
0, the power supply voltage V is read, and then it is determined whether or not the read power supply voltage V is 0 (S310).
, 0, the reading of the power source type voltage (S300) is repeated. If the power supply voltage is not V or O, proceed to the next step. Step 3
At step 20, the password code NR stored in the ROM 1.3 in the radio is input to the memory of the radio control unit 16.
In step 330, ROM1.
4 is input into the memory of the radio control section 16, and the two codes NP, . . . , NC input into these memories are compared in step 340.

If the two codes NR and NC do not match, the CD player 2 returns to the normal control routine with the power relay 19 in the CD player kept in the OFF state, assuming that it is a stolen item. On the other hand, the two codes 1'NR, NC
If they match, the power relay 19 in the CD player is set to the ON state (S350), and as a result, the CD
The player 12 is enabled for use, after which the normal control routine returns. In this way, if it cannot be confirmed that the password manually entered into the ROM 13 of the Arakashime Radio matches the password entered into the R2M 17 of the CD player, the CD player 12 cannot be used. This is to prevent the player 12 from being stolen.

FIG. 6 is a flowchart 1 showing processing for a CD player for retrofitting, in which the CD player 12 is
When connected to the CD player, the PIN code stored in the ROM 14 in the CD player is read out, the read code is recognized, and if it is a specific code, it is determined that the CD player 12 is a legitimately purchased CD player 12. Enter the same code as the PIN code from the radio No. 11 side into the ROM in the CD player.
This is to send the data to l4. According to this flowchart, it is first determined whether or not the CD player 12 is connected to the radio No. 11 (S400). If it is determined that the CD player 12 is not connected, the routine returns to the normal control routine, and it is determined that the CD player 12 is connected. If so, proceed to the next step. In step 410, the password code Nc stored in the ROM 14 in the CD player is input to the memory of the CD control section 15. It is determined whether or not this password code NC is a predetermined specific code (S420). If the code NC is a specific code, this code NC or the ROM1 in the radio is determined.
It is set to be equal to the memory code NR of 3 (S4
30, 5440), then the power supply relay 19 in the CD player is set to the ON state (S450) and the process returns to the normal control routine. On the other hand, PIN code 1' N C?
If it is not a specific code, it is determined whether this code NC is equal to the memory code NR in ROM13 in the radio (8480, 5470), and if they are equal, the power supply relay 19 in the CD player is set to ON state. (D45
0) Return to the normal control routine, and if they are not equal, return to the normal control routine. Note that the above-mentioned specific code may be set to "0000", for example, and may need to be stored already at the time of shipment from the manufacturer.

Furthermore, it is necessary to prevent this specific code from being set later by an operation from the radio side. A flowchart of this prevention process is shown in FIG. According to this flowchart, it is first determined whether or not this code setting operation has been performed (5500), and if there is no operation, the process returns to the normal control routine, and if there is an operation, the process proceeds to the next step. If it is determined that a setting operation has been performed, an instruction is sent to input the setting code N in step S51 [1], and this code N is input into the memory (
S520). Thereafter, in step 530, it is determined whether or not this code N is a specific code, and if it is a specific code, a setting impossible alarm is issued (S540) and step 5
Return to 10. On the other hand, if the code N is not a specific code, it is detected whether the confirmation key is activated (5550), and if it is not activated, the process returns to step 510, and if it is activated, the pin code NR of the ROM 13 in the radio is specified. The code is rewritten to N, and then the routine returns to the normal control routine. In this way, a specific code cannot be set from the radio 11 side to the CD player 12 side except in predetermined cases.

In the above flowchart, R in the CD player
If the setting code of the OM 14 is a specific code, it is determined that the CD player 12 was purchased through a regular route, thereby dealing with the case of an aftermarket type CD player 12. In other words, the initial identification code on the radio No. 11-12 = side and the initial identification code on the CD player 12 side are changed, and when the radio No. 11 and the CD player 12 purchased through the regular route are connected, the radio No. 11 side's initial identification code is changed. The code is sent to the ROM 14 of the CD player to match the two codes, thereby making it impossible to use stolen items.

Furthermore, in order to completely prohibit the use of stolen items, it is necessary to prohibit the operation of matching the password on the radio 11 side with the password on the CD player 12 side.

That is, if the codes of both the radio 11 and the CD player 12 do not match, it is necessary to make it impossible to change at least the password code in the ROM 18 in the radio. is as shown in FIG. 8, for example. In this flowchart, first, the memory code NR in the ROM 13 in the radio is input to the memory (S600), then the memory code Nc in the ROM 14 in the CD player is input to the memory (S610), and the re-memory codes NR and NC are input to the memory (S610). compared (
S620), if they do not match, the process returns to the normal control routine; if they match, the series of processes shown in FIG. 7 is performed (S63).
0), and rewriting the ROM14 in the CD player (N
c = N) (S640) and returns to the normal control routine. This series of processing makes it impossible to match the code on the radio side with the code on the CD player side, making it possible to completely prevent the use of stolen items.

Further, FIG. 9 shows a block diagram of an embodiment device different from the embodiment device shown in FIG. 2. This device omits the power supply relay in the CD player, and the power for the CD controller L8a is supplied from the power supply relay 1.7a in the radio. As a result, it is possible to simplify the circuit configuration of the CD player 12 and to make it impossible to use a stolen CD player 12, similar to the embodiment shown in FIG.

In addition, in the above embodiment, the anti-theft device for the radio 11 and the CD player 12 is explained.
Similarly, it can also be used as a theft prevention device for audio equipment such as tape cassette decks and graphic equalizers.

It should be noted that the vehicle audio anti-theft device of the present invention is not limited to the above-mentioned configuration having two functions, and various other modifications are possible.

(Effects of the Invention) According to the vehicle audio anti-theft device of the present invention, when the password codes set for each audio device do not match,
determining that at least one of the audio equipment is stolen;
At least one audio device is disabled. For this reason, if such a device were adopted in the audio system of all vehicles, it would be extremely difficult to use the stolen audio equipment in combination with other audio equipment, and this would prevent audio equipment theft. It becomes possible to reliably prevent this.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the concept of the configuration of the present invention, FIGS. 2 and 9 are block diagrams each showing an embodiment of the vehicle audio anti-theft device of the present invention, and FIG. 3 is similar to FIG. Schematic diagram showing the front panel portion of the example device shown in FIG.
8 to 8 are flowcharts 1- for explaining the operation of the embodiment apparatus shown in FIG. 2. la, 1. b...Audio equipment 2a, 2b...Code setting section 3...Code comparison means 4...Use prevention means 11...Radio 12-CD player 13, 14, 13a, 14a
-ROM15.16.15a, 16a...control unit 2
0.20a・Keyboard Figure 5

Claims (1)

[Scope of Claims] A code setting section arranged so that an arbitrary password code can be set in each of the audio devices of a vehicle audio system formed by combining at least two audio devices, and the audio devices are combined with each other. a code comparing means for reading the codes set in the code setting section of each audio device and comparing the codes to see if they are in a predetermined relationship; and a code comparing means for comparing the codes to each other. When it is determined that the specified relationship does not exist,
An audio theft prevention device for a vehicle, comprising a use prevention means for preventing use of at least one of the audio devices.