JPH08279771A - Fm multiplex broadcasting receiver - Google Patents

Abstract

PURPOSE: To easily find out a stolen FM multiplex broadcast receiver or a vehicle loading this receiver. CONSTITUTION: Concerning one of outputs FM detected by an FM tuner 2, additional information data are demodulated by a data demodulation circuit 5. The demodulated data are supplied to a CPU 7. Character data, graphic data or traffic information data, etc., are selected out of data by this CPU 7 and displayed on a display 8 as characters or graphics. When there is an ID number in a data unit DU inside a data format, this is separated by the CPU 7. Then, a present ID number stored in a ROM 6 is read out and compared with this separated ID number. When both ID numbers matche as a result of comparison, an alarm tone is generated by controlling a buzzer 10 and when an engine key is on, the vehicle is stopped by forcedly turning it off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex broadcast receiver which can be easily found even if stolen, and more particularly to an FM multiplex broadcast receiver suitable for mounting on a vehicle.

[0002]

2. Description of the Related Art FM multiplex broadcasting is a broadcasting system that provides new services by multiplexing digital signals such as text, graphic information or data by multiplexing with current FM broadcasting. As one of the services, there is a paging service as described in Broadcasting Technology, July 1994, pp. 69-73, "Mobile FM character multiplex broadcasting (visible radio)". This paging service is a service in which the sender is connected to an individual telephone line and the number of recipients is large, but data is transmitted to specific individuals by setting an ID number. Is.

On the other hand, as a conventional antitheft measure for a vehicle such as an automobile, there is a method of adding various antitheft devices to the vehicle itself. However, this kind of method of adding an anti-theft device causes an increase in cost, and the victim himself has no way to do it once he has been stolen, and he has no choice but to resort to police investigations. The probability of early detection was low.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and by using an FM multiplex broadcasting paging system, the vehicle is stolen at low cost and with high probability after the vehicle is stolen. It is intended to provide an FM multiplex broadcast receiver capable of discovering.

[0005]

SUMMARY OF THE INVENTION The present invention provides an FM multiplex broadcast receiver for receiving an FM multiplex broadcast that is FM-modulated and transmitted after multiplexing additional information data separately from the main audio signal. Storage means for storing identification number data unique to the FM multiplex broadcast receiver, detection means for detecting the identification number data from the additional information data, identification number data stored in the storage means and the detection means Match detection means for detecting a match with the identification number data from
The FM multiplex broadcast receiver is provided with a warning generation unit that issues a warning when a match is detected by the match detection unit.

The present invention is also mounted on a vehicle,
Separately from this, additional information data is multiplexed on the main audio signal, and then FM-modulated broadcasting that is FM-modulated and transmitted is received.
In the M multiplex broadcast receiver, a storage unit that stores identification number data unique to the FM multiplex broadcast receiver, a detection unit that detects the identification number data from the additional information data, and a storage unit that is stored in the storage unit. FM multiplex comprising coincidence detecting means for detecting coincidence between the identification number data and the identification number data from the detecting means, and means for stopping the engine of the vehicle when coincidence is detected by the coincidence detecting means. It is a broadcast receiver.

[0007]

According to the present invention, when the vehicle is stolen, the paging service transmitting station is configured so that the FM station mounted on the vehicle is
The ID number of the multiplex broadcasting receiver is inserted into the transmission format for transmitting the FM multiplex additional information data and transmitted. In the FM multiplex broadcast receiver, the ID number data inserted in the transmission format is detected by the detecting means.
Then, the ID number data unique to the receiver stored in advance in the storage means is supplied to the coincidence detection means, and when a coincidence is detected, the buzzer is controlled to generate a warning sound. Alternatively, the engine key of the vehicle is turned off to stop the vehicle.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the FM multiplex broadcast receiver of the present invention is applied to a vehicle will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the FM multiplex broadcast receiver of the first embodiment. In FIG. 1, 1 is a receiving antenna, 2 is an FM tuner for selecting a desired station from the FM broadcast waves received by the receiving antenna 1, performing FM detection and performing stereo demodulation, and 3 is stereo demodulation from the FM tuner 2. An amplifier 4 that amplifies the output is a speaker that outputs the audio signal from the amplifier as audio.

Reference numeral 5 is a data demodulation circuit for demodulating additional information data from the FM detection output, and 6 is an I characteristic of the receiver.
The ROM, 7 in which D number data (recognition number data) is stored in advance, compares the ID number in this ROM with the ID number detected from the received additional information data, and outputs a coincidence output when they match. C, which outputs character data separately from the additional information data
It is PU. Reference numeral 8 is a display device for receiving and displaying this character data. Reference numeral 9 is a key-off circuit for turning off the engine key of the vehicle when the CPU compares the ID numbers and a coincidence output is supplied, and 10 is a buzzer for issuing an alarm when the coincidence output is supplied.

Next, the operation of the FM multiplex broadcast receiving apparatus of this embodiment will be described. The FM multiplex broadcast signal received by the antenna 1 is FM detected by the FM tuner 2. One of the detected outputs is stereo-demodulated, then amplified by the amplifier 3 and emitted from the speaker 4. The other detection outputs are subjected to L-MSK demodulation, synchronous reproduction and error correction by the data demodulation circuit 5 to demodulate additional information data. The demodulated data is C
It is supplied to PU7. The CPU 7 selects character data, graphic data, traffic information data, or the like from the data, and displays them on the display 8 as characters or graphics.

On the other hand, when the vehicle equipped with the FM multiplex broadcast receiver is stolen, the owner of the vehicle calls the paging service transmitting station and the ID of the FM multiplex broadcast receiver installed in the stolen vehicle. Give the number. Then, the paging service transmitting station inserts this ID number into the transmission format and transmits it.

The CPU 7 separates the ID number of the data unit DU in the above-mentioned data format, which will be described later. Then, the own ID number stored in the ROM 6 is read and compared with the separated ID number.
If the two match as a result of the comparison, the CPU 7 determines that the vehicle is a stolen vehicle, controls the buzzer 10 to generate an alarm sound, and controls the key-off circuit 9 to forcibly turn off the engine key. The vehicle is stopped by
At this time, the power of the FM multiplex broadcast receiver is forcibly maintained in the ON state, and the alarm sound continues to be emitted.

Even when the power switch of the receiver itself is in the off state, the FM tuner 2, the data demodulation circuit 5 and the CPU 7 are always energized so that the engine key is in the off state. The buzzer 10 can be configured to generate an alarm sound when the ID numbers match.

As described above, according to this embodiment, the stolen vehicle can be prevented from moving outside the service area by forcibly stopping the stolen vehicle while it is on the run. In addition, the alarm sound makes it possible for a person in the vicinity to detect an abnormality and report it to the police, thereby facilitating an investigation by the police.

Therefore, the probability of finding a stolen vehicle is improved.
Next, the data format for transmitting the ID number in this embodiment will be described. In this embodiment, the mobile reception system F
DARC (DAta Radio C) which is M multiplex broadcasting
An example applied to a format for transmitting character and graphic information in the (channel) system is shown.

FIG. 2 shows a frame structure of FM multiplex broadcasting. In FM multiplex broadcasting, one frame consists of a matrix of 288 × 272 bits. Each row is called a block, 1
The frame includes blocks for transmitting 190 pieces of data and blocks for 82 parity for transmitting the parity in the column direction. The first 16 bits of each block is a block identification code (BIC) for identifying the block.
Then, the frames are sequentially and continuously transmitted, and within one frame, the block numbers 1 to 272, which are the first blocks, are transmitted.
Sequentially transmitted.

FIG. 3 shows the relationship between the packet and the data block. The data block is one packet (288 bits), the leading 16-bit block identification code, the 32-bit prefix, the final 82-bit check bit and the 14-bit CRC. It consists of 144-bit data excluding the sign.

A data group is composed of one or a plurality of data blocks. This data group has a heading start code (SO
H), a data group link code, a data group size, and data group data follow, and ends with a data group end code and a CRC code.

The data group data is composed of a data header identification consisting of an information separation code RS and a data header parameter, data header data and 0, 1 or a plurality of data units.

In this embodiment, an ID number is inserted in one of the data units DU and transmitted. The ID number may be inserted into the data group number in the prefix in FIG. 3, or the upper bits of the ID number may be divided into the data unit DU and the lower bits of the ID number may be divided into the data group number. You may insert it.

Although this embodiment is an example applied to an FM multiplex broadcast receiver mounted on a vehicle, it may be applied to a portable FM multiplex broadcast receiver. That is, in this case, it is effective when the receiver itself is stolen, and it is possible to make it impossible for the thief to use it by generating an alarm sound.

[0023]

As described above, if the FM multiplex broadcast receiver according to the present invention is mounted on a vehicle, when the vehicle is stolen, the stolen vehicle can be found early.

Further, by using the paging service of FM multiplex broadcasting, it becomes unnecessary to equip the vehicle with an expensive antitheft mechanism. Furthermore, it is possible to prevent the FM multiplex broadcast receiver from being used by a thief.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an FM multiplex broadcast receiver used in an embodiment of the present invention.

FIG. 2 is a diagram showing a frame structure in FM multiplex broadcasting of the present embodiment.

FIG. 3 is a diagram showing a packet configuration in FM multiplex broadcasting of the present embodiment.

FIG. 4 is a diagram showing a structure of data group data in FM multiplex broadcasting of the present embodiment.

[Description of sign]

 5 Data demodulation circuit 6 ROM 7 CPU 8 Display 9 Key-off circuit 10 Buzzer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanobu Ishimoto 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. An FM multiplex broadcast receiver for receiving an FM multiplex broadcast that is FM-modulated and transmitted after additional information data is separately multiplexed with a main audio signal, the FM multiplex broadcast receiver being unique to the FM multiplex broadcast receiver. Storage means for storing the identification number data, the detection means for detecting the identification number data from the additional information data, the identification number data stored in the storage means and the identification number data from the detection means An FM multiplex broadcast receiver comprising: a coincidence detecting means for detecting a warning and a warning generating means for issuing a warning when a match is detected by the coincidence detecting means. 2. The main audio signal, which is mounted on a vehicle,
In addition to the above, in the FM multiplex broadcast receiver for receiving the FM multiplex broadcast that is FM-modulated and transmitted after the additional information data is multiplexed, a storage unit for storing the identification number data unique to the FM multiplex broadcast receiver. Detecting means for detecting identification number data from the additional information data, coincidence detecting means for detecting coincidence between the identification number data stored in the storage means and the identification number data from the detecting means, and the coincidence means An FM multiplex broadcast receiver comprising means for stopping the engine of the vehicle when a match is detected by the detection means. 3. The FM multiplex broadcasting receiver according to claim 1, wherein the identification number data is inserted into a data unit in a DARC transmission format and transmitted.