JPH06311061A - Fm multiplex broadcast receiver - Google Patents

Abstract

PURPOSE:To facilitate channel selection of a traffic information transmission station and acquisition of information. CONSTITUTION:A control section 11 controls a voice selection means 17 and an FM/AM PLL circuit 1/13 by operating a T.INFO key 12a provided to the operation section 12 to start automatic seeking and when a tuning station is an FM station, an FM multiplex decoder circuit 7 checks an identification code and a program number and when the tuning station is a traffic information station, a display control section 11a selects the display of a display section 10 for traffic information and in the case of character graph information, a voice selection means 17 selects a voice signal before the T.INFO is operated to provide and select an output to the display section 10 only and in the case of voice information, a multiple voice signal is selected. In this case, when the announcement of multiple voice signal is finished, the original audio signal is selected and the multiple audio signal is selected every time information is revised afterward.

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, and more particularly to a technique for demodulating the traffic information by synchronizing the receiver with a traffic information station which transmits the traffic information by superimposing it on the FM multiplex broadcast signal. Regarding

[0002]

2. Description of the Related Art Conventionally, a car radio as a mobile receiver has been required to easily obtain data information such as traffic information and to provide other useful data information. At present, RDS (Radio Data System) is put to practical use in Europe by EBU (European Broadcasting Union). On the other hand, in Japan, the telecommunications technology council aims to effectively utilize existing FM broadcasting waves and equipment to provide additional information to the extent possible.
Multiplex broadcasting has been proposed and is being put to practical use.

This FM multiplex broadcasting is a system in which various digital data information is superimposed on an FM broadcasting signal and transmitted.
The contents of transmission include (1) characters and figures, and (2) receiver control signal (additional information).

The encoding system is common with the TV multiplex character broadcasting which has already been put into practical use, and is simplified. That is, it is for facilitating program exchange in program production of TV multiplex character broadcasting and FM multiplex character / graphics broadcasting. The outline of the character and graphic sets that are encoded and transmitted, the contents of their control, and the currently considered additional information contents are shown below. (1) Character set Kanji, hiragana, katakana, alphanumeric characters, dynamic redefinition character set, mosaic, geometric, etc. (2) Graphic Photographic graphic transmitted by pixel, mosaic graphic / dynamically redefined character set graphic transmitted by character code, geometric graphic transmitted by graphic description command. (3) Character control Character size control, color control, flushing, concealment, etc. (4) Additional information Broadcast station name, program category, time, program identification, traffic information flag, broadcast station identification, alternative frequency list, etc. As described above, in the FM multiplex broadcasting, various messages are multiplex-transmitted to the FM broadcasting being received, so that it becomes possible to obtain unprecedented information.

On the other hand, regarding traffic information in the AM band, conventionally, it is possible to perform synchronization by simple operation upon reception.
T. INFO (Traffic information)
There is a dedicated key as n), and AM can be operated by one key operation from a plurality of modes including external input provided in the receiver, for example, any mode such as radio, tape, and CD.
It was possible to output audio by tuning to a traffic information station of 1620 kHz or AM 1629 kHz.

[0006]

The present invention is based on the above-mentioned AM.
It is possible to demodulate the traffic information by synchronizing the conventional one, which is only capable of receiving only the traffic information, to the traffic information station in the FM multiplex broadcasting of the FM band by a simple operation, so that a lot of FM multiplex broadcasting is available. It aims to effectively utilize various data information.

[0007]

According to the present invention, there is provided an FM multiplex broadcast receiver which demodulates and uses multiplex data including an identification code and the like transmitted superimposed on an FM multiplex broadcast signal. The traffic information is provided with a control unit that controls the operation of the entire receiver, a voice selection unit that selects and outputs one from a plurality of voice sources, and a display unit that displays characters and figures based on the multiplex data. Detects the identification code in the multiplexed data of the signal received with the reception operation,
If the detected identification code is for traffic information, the control unit switches the output to the display unit to traffic information display,
If the traffic information is character / graphic information, the display output is switched, and the voice selection means is caused to select the voice immediately before the traffic information reception operation. If the traffic information is voice information, the voice selection means The problem is solved by switching from the voice immediately before the information receiving operation to the multiple voice.

[0008]

In the FM multiplex broadcast receiver having the above-mentioned configuration, the operation of the traffic information receiving operation key starts the selection of the traffic information transmitting station in any mode of the receiver. When the traffic information transmission station is selected, the identification code in the multiplex data is detected, and if the detected identification code is traffic information, the display on the display is switched to the traffic information display, and the traffic information is displayed. If is character / graphic information,
The display output is switched and the voice selection means is caused to select the voice immediately before the traffic information receiving operation. If the traffic information is voice information, the voice selecting means is switched from the voice immediately before the traffic information receiving operation to the multiple voice. Channel selection operation for the traffic information transmitting station becomes easy, and the contents of display and voice output are automatically obtained properly.

[0009]

1 is a block diagram of the essential parts of an FM multiplex broadcast receiver for realizing traffic information reception according to the present invention. 1
Is a PLL circuit, which outputs a predetermined voltage signal corresponding to a station to be received to the FM front end 2. The FM front end 2 receives the broadcast input from the antenna ANT based on the voltage signal, and outputs a predetermined intermediate frequency signal (I
F). 3 is an intermediate frequency amplification detection circuit, F
The intermediate frequency signal converted by the M front end 2 is amplified to a predetermined level and detected.

An FM multiplex decoder circuit 7 demodulates a multiplex program consisting of FM multiplex data sent at a predetermined transmission timing. An error correction circuit 8 detects an error in the multiplex data demodulated by the FM multiplex decoder circuit 7 in synchronization with each group and corrects the error.

A signal meter circuit 9 detects the level of the reception state of the receiving station by monitoring the signal strength (eg, electric field strength) of the intermediate frequency signal output from the intermediate frequency amplification detection circuit 3.

Reference numeral 10 is a display unit for displaying characters and figures from the multiplexed data. Reference numeral 11 denotes a control unit that controls the entire operation of the FM multiplex broadcast receiver, a display control unit 11a that causes the display unit 10 to display characters, figures, etc. based on the multiplex data, and an error rate that detects the error rate of the multiplex data. A detection unit 11b, a check unit 11c that checks whether the error rate is within an allowable range, an identification code detection unit 11d that detects the identification code in the multiplex data, an allowable range of the error rate, and to store for each identification code. The storage unit 11e has a plurality of storage areas divided into.

Reference numeral 12 denotes an operation unit having an operation key for operating the FM multiplex broadcast receiver and for causing the display unit 10 to display the multiplex data stored in the storage unit 11e.
In this embodiment, the T.M. INF
O key 12a, up / down key 12b for up / down of the tuning frequency, seek key 12c for automatic tuning, and memory key 1 for storing the selected station
2d and.

Reference numeral 13 denotes an AM band PLL circuit, which outputs a predetermined pressure transmission signal corresponding to a station to be received to an AM front end 14. The AM front end 14 inputs it from an antenna ANT based on a voltage signal. It receives a broadcast and converts it into a predetermined intermediate frequency signal (IF). Reference numeral 15 is an intermediate frequency amplification detection circuit, which is an AM front end 14
The intermediate frequency signal converted by is amplified to a predetermined level and detected. A signal meter circuit 16 detects the level of the reception state of the receiving station by monitoring the signal strength (for example, electric field strength) of the intermediate frequency signal output from the intermediate frequency amplification detection circuit 15.

Reference numeral 17 is a voice selecting means, which is controlled by the control section 11 to switch the CD and is connected to the receiver.
An audio output such as a tape, an audio output of the intermediate frequency amplification detection circuit 3 of the FM, and an audio output of the intermediate frequency amplification detection circuit 15 of the AM are selected and switched to be output as an audio output to an amplifier and a speaker (not shown). . For simplification of description, an MPX circuit and an operation unit 1 for FM stereo signal demodulation, which are not directly related to the present invention.
Some of the operation keys provided in 2 are omitted.

The operation of the FM multiplex broadcast receiver shown in FIG. 1 will be described below. A broadcast in which multiplex data is superimposed on the basis of a voltage signal corresponding to a transmission frequency of a predetermined broadcasting station output from the PLL circuit 1 or 13 in the FM or AM band by the operation selection of the operation unit 12 of the FM multiplex broadcast receiver. Radio waves are received by the FM or AM front end 2 or 14 via the antenna ANT, amplified by the intermediate frequency amplification detection circuit 3 or 15 and detected, and output as an audio signal, and either the FM or AM is selected by the audio selection means 17. Selected and output.

In the general receiving state as described above, the T.S.T. INFO key 1
When 2a is operated, the control unit 11 operates the PLL circuit 1 or 13 to start auto-seek to select a station that is transmitting traffic information, regardless of which mode the receiver is operating. . That is, the operation mode until then is C
If it is D or tape, etc., the audio selection means 17 is switched to AM or FM radio output, and if the operation mode is radio reception until then, seek is started from the frequency band that has been received and the frequency band is reached. If there is no traffic information transmitting station, the seek operation is performed by moving to another frequency band. INFO
Release the mode commanded by operating the key 12a,
Return to the mode prior to key operation.

The AM band is 1 for channel selection by the seek operation.
At 620 and 1629 kHz, FM band, all channel steps should be checked, and if the electric field strength of the received station is equal to or higher than a predetermined value, tuning is temporarily fixed to that station.
If the station is in the AM band, the voice selecting means 1
7 is switched to AM for voice output, and if the station is in the FM band, the FM multiplex decoder circuit 7 demodulates the multiplex data, and the identification code detection circuit 11d checks the service identification code and program number.

If the checked service identification code and program number belong to the traffic information station, the display control section 11a switches the display on the display section 10 to that for traffic information.

If the demodulated traffic information is character or graphic information, the voice selection means 17 is a T.S. The voice before the INFO key 12a is operated is selected and output, and only the display output to the display unit 10 is switched.

If the demodulated traffic information is voice information,
The voice selection means 17 is a T.V. The voice before the INFO key 12a is operated is switched to the multiple voice of the traffic information. In this case, when the announcement of the multiple voices of the traffic information is completed, the voices of the original source are restored, and then the multiple voices are switched every time the information is updated.

The page turning of the display screen for the display unit 10 by the display control unit 11a is shared with the up / down key 12b for tuning, and the page number is moved up / down. In addition, T. The operation mode of the INFO key 12a is configured so that it can be released by operating the same key again or by using another source such as a play key of a CD.

If the station whose tuning is temporarily fixed by the seek operation is not desired, the T. INF
By operating the seek key 12c in the O key 12a operation mode, another station can be selected.

The selection of the traffic information station having the above-mentioned configuration is centered on the seek operation, but the next channel selection can be made easier by writing the selected traffic information station in the frequency memory area. That is, the multiplex data of the FM station being received is demodulated by the FM multiplex decoder circuit 7, and it is determined whether the station is a traffic information station based on the service identification code and the program number. The memory area (not shown) connected to the memory key 12d of becomes the writable state automatically or
The frequency is written to the memory by operating d.

The memory has 1620 kHz and 16 AM bands.
It has a memory area of about 29 kHz and 6 stations of FM band. AM16 each time the INFO key 12a is operated
20 kHz → AM 1629 kHz → FM 1 → FM 2
→ ・ ・ ・ …… → FM 6 → AM 1620kHz It is possible to tune to the traffic information station only in a toggle manner.
Furthermore, in AM, voice switching, in FM display switching /
It is also possible to perform voice switching and the like.

Even in the FM multiplex broadcast receiver configured as described above, the listener is listening to the main audio broadcast program,
Sometimes you miss the traffic information broadcast, which is a behind-the-scenes program. Therefore, in this embodiment, the multiplex data is sequentially captured and stored, and can be reproduced as information at a proper time. The explanation is given below.

The data demodulated by the FM multiplex decoder circuit 7 is input to the control unit 11 after the data error is corrected by the error correction circuit 8, and the error rate detection unit 11b of the control unit 11 detects the error rate. . The multiplexed data output from the error correction circuit 8 is provided with flags such as no error, corrected, and uncorrectable, and the error rate of the data can be detected by counting this flag.

The error rate detected by the error rate detection section 11b is checked by the check section 11c to determine whether it is within the range of the error rate stored in the storage section 11e. If the error rate is not within the range, the error rate is deleted. If so, it is directly input to the identification code detection unit 11d in the multiplex data, and the identification code is sequentially stored in the storage area of the corresponding storage unit 11e,
When the storage capacity is full, the old data is discarded in order, and new data is always written, and an operation key (not shown) is used to obtain traffic information from the multiple data stored in the storage unit 11e by the user. When operated, the operation command is input, and the display control unit 11a calls the traffic information data from the storage area corresponding to the traffic information identification code stored in the storage unit 11e, and displays the traffic information on the display unit 10 in chronological order. It can be displayed and used.

In the above embodiments, the display data is stored and displayed, but it is also possible to store voice data and the like in addition to the display data and reproduce it.

[0030]

As described above, according to the present invention, by operating the traffic information receiving operation key in the FM multiplex broadcast receiver, the traffic information transmitting station can be selected in any mode of the receiver. When the traffic information transmitting station is selected, the identification code in the multiplex data is detected, and if the detected identification code is traffic information, the display on the display is switched to the traffic information display. If the traffic information is character / graphic information, the display output is switched and the voice selection unit is made to select the voice immediately before the traffic information reception operation. If the traffic information is voice information, the voice selection unit is the traffic information reception operation. Since it is configured to switch from the immediately preceding voice to multiple voices, it is easy to tune in to the traffic information transmitting station, and the contents of the display and voice output are automatically obtained automatically to drive the vehicle. It is intended to contribute significantly to Za.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

[Explanation of symbols]

1 FM band PLL circuit 2 FM front end 7 FM multiplex decoder circuit 10 Display unit 11 Control unit 12 Operation unit 12a T. INFO (Traffic Information)
ation) key (traffic information reception operation means) 12c seek key 13 AM band PLL circuit 14 AM front end 17 voice selection means

Claims (1)

[Claims] 1. An F which demodulates and reproduces multiplex data including an identification code and the like which is superimposed and sent on an FM multiplex broadcast signal.
In an M multiplex broadcast receiver, a control unit for controlling the operation of the entire receiver, an audio selection means for selecting and outputting one from a plurality of audio sources, and a display for displaying characters, figures, etc. based on the multiplex data. And an identification code in the multiplexed data of the signal received with the traffic information receiving operation, and if the detected identification code is traffic information, the control unit The output is switched to traffic information display, and if the traffic information is character / graphic information, the display output is switched and the voice immediately before the traffic information receiving operation is selected by the voice selection means. For example, in the FM multiplex broadcast receiver, the voice selection means switches from the voice immediately before the traffic information receiving operation to the multiple voice.