JP3065445B2 - 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 selecting and storing a multiplex broadcast program consisting of multiplex data superimposed on an FM broadcast signal.

[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 characters and graphic sets that are encoded and transmitted 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, such an FM multiplex receiver on which multiplex data is superimposed receives a multiplex broadcast program from a broadcasting station, especially when driving a car, and displays the multiplex data. Is often overlooked even if it is displayed on a display device, for example. Therefore, there is a problem that a large-capacity memory is required if all of the data contents of various and various multiplex broadcast programs are always stored and called up at appropriate times to be displayed on the display device.

Accordingly, an object of the present invention is to provide an FM multiplex receiver which automatically selects a multiplex broadcast program based on an identification code and stores only a necessary multiplex broadcast program.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided an FM multiplex reception system using an identification code for identifying a multiplex broadcast program included in multiplex data transmitted by being superimposed on an FM multiplex broadcast signal. A storage means,
An identification code detection unit that detects the identification code and stores the identification code in the storage unit; an operation unit; and a title including characters and the like corresponding to the identification code stored in the storage unit in response to an operation of the operation unit. Display control means to be displayed on the means, and when one of the titles displayed on the display means is selected by the operating means, a multiplex broadcast program is selected based on the identification code of the title and stored in the storage means. This is achieved by the multiplex program selection means for causing

[0008]

When the multiplex broadcast program is received, the identification code detecting means sequentially detects the identification code and stores it in the storage means. Therefore, the control means calls the identification code of the storage means in response to the operation of the operation means, and displays the title corresponding to the identification code on the display means. Then, when one of the titles displayed on the display means is selected by the operation means, a multiplex broadcast program is selected based on the identification code of the title and stored in the storage means.

[0009]

FIG. 1 is a block diagram of a main part of an FM multiplex receiver according to the present invention. First, the configuration will be described.
And a predetermined voltage signal corresponding to a station to be received.
Output to M front end 2. 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 FM 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. 10 is the title of the multiplex broadcast program,
And a display unit for displaying the contents in characters and figures. The title is an identification code for identifying a multiplex broadcast program included in the multiplex broadcast program, specifically, in the display unit 10.
In the case of an identification code indicating the content of traffic information, for example, "traffic information" is displayed, and in the case of an identification code indicating the content of weather forecast, "weather forecast" is displayed. FIG. 2 is a display example of titles in the FM multiplex receiver according to the present invention. In this display example, for example, display numbers are assigned, traffic information is "1 traffic information", and weather forecast is "2.
Characters such as “weather forecast” are displayed on the display unit 10.

A control unit (for example, a microcomputer) 11 controls the overall operation of the FM multiplex receiver.
Denotes an operation unit. The control unit 11 includes first to third storage units 11
b, 11c, 11e, and a first storage unit 11b which detects an identification code for identifying a multiplex broadcast program.
When one of the titles displayed on the display unit 10 is selected by the operation unit 12, the identification code of the title is stored in the second storage unit 11c, and the identification code is stored in the second storage unit 11c. A multiplex program selection unit 11d for selecting a multiplex broadcast program based on the code and storing the data in the third storage unit 11e, an identification code stored in the first storage unit 11b according to an operation command, a third storage unit 11e.
The display unit 10 has a display control unit 11f for calling the multiplex broadcast program data stored therein, displaying the title of the identification code on the display unit 10, and displaying the information content of the multiplex broadcast program data.

The operation unit 12 has a recall key (R) 12a for calling a title corresponding to the identification code of the multiplex broadcast program displayed on the display unit 10 and a cursor display for selecting the displayed title displayed vertically. Up / down key 12b for up / down, six number keys 12c from number 1 to number 6, and identification code corresponding to the title selected by up / down key 12b are stored in third storage unit 11e. It has a memory key (M) 12d pressed together with the number key 12c, and a select key (S) 12e pressed together with the number key 12c to call the title and display its contents on the display unit 10.

FIG. 3 is a flowchart for explaining a process until the control unit 11 of the FM multiplex receiver according to the present invention stores a multiplex broadcast program. Hereinafter, the operation of the FM multiplex receiver of FIG. 1 will be described according to this flowchart. In a state where a multiplex broadcast program from a predetermined broadcast station is being received by a reception operation unit (not shown) of the FM multiplex receiver, various types of multiplex data superimposed on the FM broadcast and transmitted are provided. The control unit 11 receives the multiplex programs one after another via the FM multiplex decoder circuit 7 and the error correction circuit 8 (step 1).
01), an identification code for identifying the multiplex broadcast program is detected from the multiplexed data by the identification code detection unit 11a (Step 102), and the code is stored in the first storage unit 11b (Step 103), and the automobile moves around. A list of multiplex broadcast programs for which multiplex data information can be obtained in a region.

Here, the recall key (R) of the operation unit 12
When an identification code display command for calling the identification codes listed by 12a is input (step 10).
4), the display control unit 11f calls up the code from the first storage unit 11b and causes the display unit 10 to display the title (step 105). Then, the multiplex program selection unit 11d waits for a title selection storage command from the operation unit 12 (step 10).
6). Therefore, referring to FIG. 2, for example, "1 traffic information" is selected from the displayed titles by the up / down key 12b of the operation unit 12, and the memory key (M) 1 is selected.
When (1) of the number key 12c is pressed after pressing 2d, the multiplex program selection unit 11d stores the identification code corresponding to the title in the second storage unit 11c (step 10).
7). This storage process can be repeated within the range of the number of identification codes stored in the first storage unit 11b.

Further, the multiplex program selection section 11 stores the second storage section 1
The multiplex broadcast program is received based on the identification code stored in 1c (step 108), and the multiplex broadcast program data is stored in the third storage unit 11e (step 109). This is a series of flows for selecting and storing multiplex broadcast program data.

If it is desired to call a multiplex broadcast program stored in the third storage unit, the following may be performed. For example,
Memory key (M) 12d and number key 12c of operation unit 12
When the user wants to call and display the multiplex broadcast program data related to the traffic information stored in the third storage unit 11e according to (1), the user first presses the select key (S) 12e of the operation unit 12 and presses the number key 12c (1). By pressing, characters, graphics, etc., composed of the multiplex broadcast program data are displayed on the display unit 10.

[0018]

As described above, according to the present invention, it is possible to display a title including characters and the like corresponding to the identification code detected from the multiplex data of the FM multiplex broadcast signal on the display means, When one of the titles displayed on the display means is selected by the operating means, the multiplex broadcast program can be selected and stored in the storage means based on the identification code of the title, so that the required multiplexing is performed. Only the broadcast program data can be automatically stored, and the storage capacity can be effectively used.

[Brief description of the drawings]

FIG. 1 is a main block diagram of an FM multiplex receiver showing one embodiment of the present invention.

FIG. 2 is a display example of titles in the FM multiplex receiver of FIG. 1;

FIG. 3 is a flowchart for explaining processing until a control unit 11 of the FM multiplex receiver shown in FIG. 1 stores a multiplex broadcast program in a storage unit.

[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 9 Signal meter circuit 10 Display unit 11 Control unit 11a Identification code detection units 11b, 11c, 11e First to third storage units 11d Multiplex Program selection unit 11f Display control unit 12 Operation unit

Claims (1)

(57) [Claims] 1. An FM multiplex receiver using an identification code for identifying a multiplex broadcast program included in multiplex data transmitted by being superimposed on an FM multiplex broadcast signal, comprising: storage means; An identification code detection means for detecting the identification code and storing the identification code in the storage means, an operation means, and a title comprising characters or the like corresponding to the identification code stored in the storage means in response to the operation of the operation means, displayed on the display means. A display control means for causing a multiplex program to be selected and stored in the storage means based on an identification code of the title when one of the titles displayed on the display means is selected by the operating means. An FM multiplex receiver comprising: selecting means.