JP3108242B2 - FM multiplex receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex receiver , and more particularly to an FM multiplex receiver for storing and reproducing multiplex data superimposed on an FM multiplex broadcast signal for each identification code.
About the machine .

[0002]

2. Description of the Related Art Conventionally, a car radio as a mobile receiver has been required to provide other useful data information in addition to easily obtaining data information such as traffic information. At present, in Europe, EBU
(Radio Data System) has been put to practical use by the European Broadcasting Union. On the other hand, in Japan, the Telecommunications Technology Council has proposed FM multiplex broadcasting for effectively utilizing existing FM broadcasting radio waves and facilities and providing additional information as much as possible, and is being put to practical use.

[0003] This FM multiplex broadcasting is a system in which various digital data information is superimposed on an FM broadcasting signal and transmitted.
The transmission contents include (1) characters and graphics and (2) receiver control signals (additional information).

[0004] The encoding system is shared with TV multiplex teletext currently in practical use and is simplified. That is, it is for facilitating the exchange of programs in the production of TV multiplex text broadcasting and FM multiplex text / graphic broadcasting. The outline of the encoded and transmitted character and graphic sets and their control are shown below. The contents of additional information that are currently considered are shown below. (1) Character set Kanji, hiragana, katakana, alphanumeric characters, dynamically redefined character set, mosaic, geometric, etc. (2) Graphic A photographic graphic transmitted by a pixel, a mosaic graphic / dynamically redefined character set graphic transmitted by a character code, and a geometric graphic transmitted by a graphic description instruction code. (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 multiplexed and transmitted to the received FM broadcasting, so that it is possible to obtain new information.

[0005]

However, in an FM multiplex receiver on which such a multiplex data program is superimposed, since the listener usually listens to the main audio broadcast program, the multiplex data program which is the counter program is However, there is a problem that even if the program is broadcast in synchronization with the main audio broadcast program, the program is lost.

Accordingly, an object of the present invention is to provide an FM multiplex receiver capable of sequentially taking in and storing multiplexed data for each identification code, and reproducing the information as appropriate.

[0007]

Means for Solving the Problems The above object is achieved by FM multiplex broadcasting.
Multiple codes including identification codes etc. sent superimposed on the transmission number
In an FM multiplex receiver that demodulates and reproduces heavy data,
An operation for issuing an operation command for designating a predetermined identification code
Operating means and storing multiplexed data for each predetermined identification code.
Storage means for detecting an identification code in the multiplexed data
Identification code detecting means;
When a certain identification code is detected, it corresponds to the identification code
And store the multiplexed data in the storage means.
When the operation means is operated, the operation
Multiplex data corresponding to the identification code to be
From the oldest to the oldest
Is achieved by

[0008]

In the FM multiplex receiver having the above configuration, a predetermined
Operation means for issuing an operation command for designating an identification code
And storage for storing multiplexed data for each predetermined identification code
Means are provided, and a predetermined
When an identification code is detected, it is made to correspond to the identification code.
To store the multiplexed data in the storage means.
When the step is operated, the identification code corresponding to the operation command
Multiplexed data corresponding to the
Put out and play.

[0009]

FIG. 1 is a block diagram of a main part of an FM multiplex receiver for realizing a multiplex data reproducing method according to the present invention. First,
Explaining the configuration, reference numeral 1 denotes 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 a broadcast station input from the antenna ANT based on the voltage signal, and generates a predetermined intermediate frequency signal (IF). Reference numeral 3 denotes an intermediate frequency detection amplifier that amplifies the intermediate frequency signal converted by the FM front end 2 to a predetermined level and detects the signal.

Reference numeral 4 denotes MPX, which is an intermediate frequency detection amplifier 3
Demodulated into a stereo signal. 5
Is an AMP (amplifier), which amplifies a stereo signal according to a volume setting value (not shown). Reference numeral 6 denotes a speaker which is driven by the AMP 5 and outputs an audio signal.
An FM multiplex decoder circuit 7 demodulates a multiplex program composed of FM multiplex data transmitted at a predetermined transmission timing. An error correction circuit 8 detects an error of the multiplexed data demodulated by the FM multiplex decoder circuit 7 while synchronizing each group, and corrects the error.

Reference numeral 9 denotes a signal meter circuit which 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 detection amplifier 3.

Reference numeral 10 denotes a display unit for displaying characters, figures, and the like from the multiplexed data. Reference numeral 11 denotes a control unit for controlling the overall operation of the FM multiplex receiver, a display control unit 11a for displaying characters and graphics on the display unit 10 based on the multiplexed data, and an error rate for detecting an error rate of the multiplexed data. A detecting unit 11b, a checking unit 11c for checking whether the error rate is within an allowable range, an identification code detecting unit 11d for detecting an identification code in the multiplexed data, an error rate allowable range, and storing for each identification code. A storage unit 11e having a plurality of divided storage areas is provided.

Reference numeral 12 denotes an operation unit having operation keys for displaying multiplexed data stored in the storage unit 11e on the display unit 10 of the FM multiplex receiver. In this embodiment, for example, 12a is a traffic signal for each different identification code. For information, 12b is provided with two keys for weather forecast information.

Hereinafter, the operation of the FM multiplex receiver of FIG. 1 will be described in detail. Operate the operation unit 12 of the FM multiplex receiver to set P
The FM front end 2 receives a broadcast wave on which multiplexed data is superimposed based on a voltage signal corresponding to the frequency of a predetermined broadcast station output from the LL circuit 1 via an antenna ANT, converts the broadcast wave to an intermediate frequency, and outputs the intermediate frequency I do. Then, the intermediate frequency detection circuit 3 inputs and detects the intermediate frequency and outputs it as a detection signal. The detection signal is input to the MPX 4 and, at the same time, to the FM multiplex decoder circuit 7 and demodulated into multiplexed data. The demodulated multiplexed data is corrected by the error correction circuit 8 for a data error.
Is input to

The control unit 11 to which the multiplexed data is input detects the error rate by the error rate detection unit 11b. The multiplexed data output from the error correction circuit 8 is provided with flags such as no error, corrected, and uncorrectable. By counting these flags, the data error rate can be detected. .

The error rate detected by the error rate detecting section 11b is checked by a checking section 11c to determine whether it is within the range of the error rate stored in the storage section 11e. If there is, it is directly input to the identification code detection unit 11d in the multiplexed data, and is sequentially stored in the storage area of the corresponding storage unit 11e based on the identification code. When the storage capacity of the storage unit 11e is full, the storage unit 11e is discarded from the oldest one and always writes new data.

After that, when the owner of the automobile presses an operation key (for displaying traffic information) 12a of the operation unit 12 in order to obtain traffic information on the road from the multiplexed data stored in the storage unit 11e. Then, the operation command is input, 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 causes the display unit 10 to display the traffic information in chronological order.

FIG. 2 is a display example of the display unit 10 in the FM multiplex receiver according to the present invention. Referring to FIG. 2, when the operation key 12a (for traffic information) is pressed, the display unit 10 is displayed.
"Traffic information memory 1 OUT" as shown in FIG. 2A means that traffic information is output from the storage unit 11e.
Is displayed. “Traffic information memory 1 OUT” indicates that the traffic information data stored in the storage area of No. 1 in the storage area of the traffic information identification code is output. Check unit 1 of control unit 11
The fact that the error rate was not within the allowable range of the error rate stored in the storage unit 11e and was deleted in 1c, for example, for a predetermined time, as shown in FIG.
R "is displayed. This display indicates that the reception state is poor.

When the operation key 12a (for traffic information) is pressed, for example, when the weather forecast information is received and the data is fetched, before the traffic information is displayed, FIG. A display such as "weather forecast ON AIR" is displayed for a predetermined time as shown in (c) to indicate that weather forecast information is being received. When it is desired to receive a weather forecast, the weather forecast can be switched from a radio display to a weather forecast display by switching with a multiplexed data switching key (not shown).

In this embodiment, display data is stored,
Although the display has been described, in the present invention, it is also possible to store audio data and the like in addition to the display data and reproduce the audio data. A removable memory such as an IC memory card may be used for the storage unit.

[0021]

As described above, according to the present invention, an FM multiplex receiver which demodulates multiplex data including an identification code and the like which is transmitted by being superimposed on an FM multiplex broadcast signal and reproduces the multiplex data by a reproducing means. In the multiplexed data reproducing method, the identification code in the multiplexed data is detected, the multiplexed data is sequentially stored in the storage means for each detected identification code, and when the operation means is operated, the identification code corresponding to the operation command is transmitted. Since the multiplexed data corresponding to the code is called out from the storage means and reproduced, there is an effect that the useful multiplexed data can be extracted and reproduced as information in a timely manner.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of an FM multiplex receiver for realizing a multiplex data reproducing method according to the present invention.

FIG. 2 shows a display unit 10 in the FM multiplex receiver according to the present invention.
5 is a display example.

[Explanation of symbols]

 Reference Signs List 1 PLL circuit 2 FM front end 3 Intermediate frequency detection amplifier 7 FM multiplex decoder circuit 8 Error correction circuit 10 Display unit 11 Control unit 12 Operation unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/16 H04H 1/00 H04N 7/08

Claims (1)

(57) [Claims] 1. An FM multiplex broadcast signal which is superimposed and transmitted.
Demodulates and reproduces the multiplexed data including the identification code
Operation instruction for designating a predetermined identification code in an FM multiplex receiver
Operating means and storage means for storing multiplexed data for each predetermined identification code
And identification code detection to detect identification code in multiplexed data
Means and a predetermined identification code are detected by the identification code detecting means.
Multiplexed data corresponding to the identification code
In the storage means, the operation means is operated.
When the operation command is issued,
Recalls multiplexed data from the storage means in the order of oldest and plays
Control means for performing the multiplex reception
Machine .