JPH10209896A - Character multiple broadcasting receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To know the receiving state of character multiple broadcasting from the display color of a mark by displaying a prescribed mark on a color display element for displaying a character program. SOLUTION: A display device 60 is connected with a microcomputer 50. This display device 60 is provided with a color LCD 61 as a display element. The broadcasting station of FM character multiple broadcasting is selected, and when the data of a character program are decoded and outputted from a decoder circuit 11, the data are temporarily preserved in a buffer memory 51. Also, a prescribed command is supplied from the microcomputer 50 to a display device 60, and a mark indicating that the FM character multiple broadcasting can be received, for example, 'FM' character MARK is displayed in, for example, yellow while the reproducing state of a CD at that time is displayed on the LCD 61.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext receiver.

[0002]

2. Description of the Related Art In FM broadcasting, this is called "FM text multiplex broadcasting", and it is realized that data such as text information is multiplexed and transmitted to an original audio broadcasting program.

[0003] This FM teletext broadcasting is called the DARC system, and the standard for multiplexing digital data such as text information is a subcarrier frequency: 76 kHz Transmission rate: 16 kbit / s Modulation system: LMSK error correction system : (272,190) This is a product code using a shortened difference set cyclic code.

Then, the LMSK signal is frequency-multiplexed with an audio signal (monaural signal or stereo composite signal) of an original audio broadcast program, and the frequency-multiplexed signal is transmitted.

[0005] In addition, program services such as character information include:
There is a distinction between levels 1, 2, and 3, which all display (present) character information and the like by dot display. Level 1 is a service for an FM receiver capable of displaying 15.5 characters × 2.5 lines including a header portion, and information is characters. Level 2 is a service for an FM receiver capable of displaying 15.5 characters × 8.5 lines including a header portion, and information is characters and graphics. Level 3 is an FM receiver capable of displaying a detailed map on a CD-ROM or the like, that is, a traffic information service for a navigation system.

[0006] As the level 1 program service, news, weather forecast, traffic information, entertainment and main supplementary programs are considered. In this case, entertainment includes fortune-telling, listener message boards,
It provides quizzes and town information.

The main complementary programs are, for example, when the original audio broadcast is a music program, such as the title of the music, the name of the performer, and the telephone number and FAX number at the time of the request.
It provides complementary information of the original audio broadcast program. In the following, a main complementary program is referred to as “program information” or “program link”.

Further, as a program service other than the above,
Emergency information provided at any time when there is an urgent need is also considered.

[Data Structure] FIG. 3A shows a frame structure of a data signal multiplexed in the FM teletext broadcasting. One frame of this data signal is composed of 272 blocks, and each block has 288 bits.

[0010] Also, 272 blocks of one frame are equal to 190 blocks.
Blocks of data packets and blocks of 82 vertical parity packets, and the blocks of the vertical parity packets are distributed and transmitted in the frame.

Then, a 16-bit BIC (block identification code) is added to the head of each block. This BI
As C, four types are used, whereby each parity packet is distinguished and the head of the frame is identified.

The data packet block is BI
C is followed by a 176-bit data packet, followed by a 14-bit CRC code, followed by 82 bits.
The bit has a parity check code in the horizontal direction.

In this case, the CRC code is added to detect a residual error after error correction by the product code. The block of the vertical parity packet has a vertical parity packet of 272 bits following the BIC.

Further, as shown in FIG. 3B, the data packet has a 32-bit prefix followed by a 144-bit prefix.
And a bit data block.

The prefix is composed of a service identification code, a decoding identification flag, an information end flag, an update flag, a data group number, a page number, a data link code, and a data packet number, as shown in FIG. 3C. .

In this case, the service identification code is 4 bits and identifies the contents of the program and the like. For level 1, 0: undefined 1: general information for sequential reception processing 2: recording and reception processing General information 4: Traffic information ...

Here, the sequential reception processing is a mode in which decoding processing for display is started as soon as the first data packet of program data or page data arrives in the FM receiver. Then, when the transmitting side needs to take the display timing on the receiving side, or when the decoding is not started after the final packet of the data group is obtained, the display cannot be made in time, so that the receiving processing is sequentially performed. You.

The recording / reception processing is a mode in which display decoding processing is started only after receiving all data of program data or page data and performing error correction processing using a CRC code for each data group. Therefore, the FM receiver can control the display timing of the text program in the recording and receiving process.

Further, in the prefix, the decoding identification flag is set to "1" when the error correction circuit of the FM receiver outputs data by decoding only in the horizontal direction, and after decoding the data in the horizontal and vertical directions, the decoding identification flag is set to "1". When outputting, it is set to "0".

If the decoding identification flag is "0" in the sequential reception process, the FM receiver receives the first BIC of the data packet 302 packets after receiving the first BIC of the data packet. It is defined that decoding processing for presentation of each data packet is performed at the point of time.

The information end flag is set to "1" when the data group to be transmitted with a certain data group number ends, and is set to "0" otherwise. Further, the update flag is incremented by one each time the data group is updated.

The data group number is composed of a program number and a page number. And the program number is 8
Bit: 0-255 Like, it is assigned.

The page number is 6 bits and is 1 to 62.
Therefore, one program has a maximum of 62 pages. One page corresponds to one data group, and one data group includes one or a plurality of data blocks.

Further, in the prefix, the data link code is a data link code of up to 4 because data to be included in one data group is a large amount of data in which the number of packets exceeds the maximum value of the data packet number. When data is divided into two data groups and transmitted using the same data group number with different data link codes,
This code is used to link the data groups in the order of 0 → 1 → 2 → 3. Data packet numbers are assigned in order from 0.

The above is the data format in the DARC system. Since the data transfer rate and the frame size are as described above, the time required for broadcasting or transmitting one frame of data is less than 5 seconds (= 28 seconds).
(8 bits x 272 blocks / 16k bits).

[Display Example of Text Program] The FM receiver corresponding to level 1 is provided with a display element DSP such as an LCD as shown in FIG.
The size is 5.5 characters x 2.5 lines (248 horizontal dots x 40 vertical dots). In the display area, the upper 0.5 line area is used as a display area for a header sentence, and the lower 2 line area is used as a text display area.

Then, when the FM receiver receives the text multiplex broadcast, the first page of the total table of contents is displayed on the display element DSP as shown in FIG. 5A. And thus the first
When a predetermined key operation is performed while a page is displayed, the second page of the total table of contents is displayed on the display element DSP as shown in FIG. 5B, and the other pages of the total table of contents are displayed in the same manner. Will be done.

In this general table of contents, programs are prepared in a hierarchical manner. For example, when "3. Weather forecast" is selected from the general table of contents in FIG. 5B, as shown in FIG.
The table of contents "1. Today's weather" and "2. Tomorrow's weather" in the next lower program are displayed.

Then, for example, when "2. Weather of tomorrow" is selected, as shown in FIG.
The page "Tokyo (Tomorrow) Weather Forecast" is displayed. Then, when the second page is selected in this state, as shown in FIG. 5E, "Tomorrow's weather forecast of Kanagawa" is displayed.

As described above, since the programs are prepared in a hierarchical manner in the general table of contents, a target character program can be displayed by sequentially following the programs.

[0031]

However, there are broadcasting stations that do not implement FM teletext broadcasting. In addition, even a broadcasting station that performs FM teletext broadcasting cannot properly receive FM teletext broadcasting in the case of an FM receiver mounted on a car because the reception conditions change as the car runs. Sometimes. The same applies to a case where the FM receiver is portable.

Therefore, a mark (symbol) for displaying the reception state of FM teletext broadcasting is provided on the display element DSP, and the mark is displayed when the currently received broadcast is FM teletext broadcasting. It is possible.

However, in this case, if the mark is displayed when even one packet of data has been received, the mark will be displayed even when the data for one page is not yet prepared. As a result, even if the mark is displayed, the text program may not be displayed.

Therefore, it has been considered that a mark is displayed when data for one page of a text program is completed. Then, in this case, when the mark is displayed, the data of one page of the text program is always prepared, so that one page can be displayed.

However, in this case, when the mark is not displayed, the broadcast being received is not the FM text multiplex broadcast, so the mark is not displayed, or although the broadcast is the FM text multiplex broadcast, one page of data is available. It is not possible to distinguish whether the mark is not displayed because there is no mark.

Therefore, in either display method,
After all, unless the text program is displayed, the actual reception state may not be known. In addition, for that purpose, it may be necessary to switch the display mode, and if such a switching operation is performed while the vehicle is running, safety is impaired.

The present invention is to solve such a problem.

[0038]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a text multiplex broadcast receiver is provided which multiplexes text program data into an original audio broadcast program signal and broadcasts the multiplexed signal. , A color display element for displaying the text program, and means for displaying a predetermined mark on the color display element, the display of the mark and its display color according to the reception state of the text multiplex broadcast This is a teletext receiver that can be changed. Therefore, the reception state of the text multiplex broadcast is notified by the display color.

[0039]

FIG. 1 shows an example in which the present invention is applied to an audio device mounted on a car, that is, a so-called car audio. This car audio has an FM tuner (FM receiver) 10 and a CD player 20 as signal sources of audio signals.

In this case, the FM tuner 10 has an antenna input circuit to an FM demodulation circuit and is configured in a synthesizer system. From this tuner 10, the broadcast audio of the selected broadcasting station is output. The signals L and R are extracted. Further, the tuner 10 is capable of receiving FM text multiplex broadcasting. When the FM text multiplex broadcasting is received, the data of the FM text multiplex broadcasting character program which has been decoded and error-corrected is extracted from the decoder circuit 11. It is.

Also, when reproducing from the CD player 20,
The audio signals L and R are extracted, and data such as the track number of the track being reproduced and the reproduction time are also extracted.

The audio signals L and R from the FM tuner 10 and the player 20 are supplied to an amplifier 30. In the amplifier 30, audio signals L and R of a target signal source are selected, and the volume and
The sound quality and the like are adjusted, and the selected and adjusted audio signals L and R are supplied to the left and right channel speakers 41L and 41R.

Further, a microcomputer 50 is provided for system control. Although not shown, the microcomputer 50 includes a CP for executing a program.
U, a ROM in which the program is written, a RAM for a work area, etc., and a buffer memory 51 for storing data of a text program of FM teletext broadcasting;
It has various operation keys 52.

When a command for instructing frequency and tuning is supplied from the microcomputer 50 to the tuner 10, tuning is performed in the tuner 10 and text program data from the decoder circuit 11 is transmitted to the microcomputer. 50. Further, a command for instructing an operation state and the like is supplied from the microcomputer 50 to the player 20, and data indicating the operation state and the like is supplied from the player 20 to the microcomputer 50.

A command is supplied from the microcomputer 50 to the amplifier 30 to instruct the tuner 10 and the player 20 to select the audio signals L and R, adjust the volume and sound quality, and the like.

Further, the microcomputer 50 includes:
The display device 60 is connected. The display device 60 has, for example, a color LCD 61 as a display element. This LC
For example, as shown in FIG. 4, D61 displays characters and the like in full color by combining dots, and its display area is 15.5 characters × 2.5 lines (horizontal).
248 dots x 40 dots vertically). Of the display area, the upper 0.5 line area is a display area for a header sentence, and the lower 2 line area is a display area for a text.

When character data is supplied from the microcomputer 50 to the display device 60, characters and the like corresponding to the character data are displayed on the LCD 61, and the colors of the displayed characters and the like are displayed in character units. Is changed or set with.

The FM tuner 10 and the CD player 2
0, the amplifier 30, the speakers 41L and 41R, the microcomputer 50, and the display device 60 are each unitized as a single unit.
Has a key 52 and is unitized into an operation unit.

In such a configuration, the operation of the key 52 is detected by the microcomputer 50, and the means 11, 12, or 13 is controlled according to the detection result.

When the user instructs the reproduction of a CD with the key 52, the microcomputer 50 sends the CD player 2
0 is supplied with a predetermined command, and the CD player 20 is set to the reproduction mode. Further, the microcomputer 50
A predetermined command is supplied to the amplifier 30 from the
0 is controlled so that the audio signals L and R from the CD player 20 are selected and amplified, and supplied to the speakers 41L and 41R.

At this time, data indicating the track number and the reproduction time of the track of the CD being reproduced from the player 20 are transmitted through the microcomputer 50 to the display device 6.
0, the LCD 61 displays, for example, as shown in FIG. 2, a character “CD” indicating that a CD is being reproduced, a track number “1”, and a reproduction time “0.37”, for example. Displayed in white.

Further, following the instruction to reproduce the CD, a predetermined command is supplied from the microcomputer 50 to the tuner 10, and the FM character multiplex broadcasting station is selected.
Immediately after the channel selection, the decoder circuit 11 does not output the character data of the FM text multiplex broadcasting.
No. 1 shows no information on FM teletext broadcasting.

However, when the data of the text program is decoded and output from the decoder circuit 11, the data is temporarily stored in the buffer memory 51. At this time, a predetermined command is supplied from the microcomputer 50 to the display device 60, and, for example, as shown in FIG. A mark indicating that the reception has been completed, for example, a character MARK of “FM” is displayed in yellow, for example.

Then, reception of FM teletext multiplexing proceeds,
When data for one page is received and displayed, a predetermined command is supplied from the microcomputer 50 to the display device 60, and the “MARK” of “FM” displayed on the LCD 61 is changed to, for example, blue. .

When the display of a text program is instructed by the operation keys 52, predetermined data of the data stored in the memory 51 is supplied to the display device 60, and the
61 shows the C being reproduced in the CD player 20.
A text program is displayed instead of the information of D.

Thus, in the receiver of FIG.
If FM teletext is not received according to the teletext reception status, "F
The character MARK of "M" is not displayed. When FM text multiplex broadcasting has been received, but data for one page is not available, the character MARK of “FM” is displayed in yellow. When the data for one page has been collected, the character MARK of “FM” is displayed in blue. Therefore, the reception state of these can be known from the display state and display color of the character MARK of “FM”.

Therefore, even if a character program cannot be displayed on the LCD 61 because the user listens to a CD, for example, it is possible to know the reception state of the FM text multiplex broadcast without changing the display mode. . In addition, since a manual operation for changing the display mode is not required, for example, safety during driving of the vehicle is improved.

In the above description, the apparatus 20 is a CD player, but may be an MD recording / reproducing apparatus, a cassette player, or the like.

[0059]

According to the present invention, it is possible to know the reception state of the text multiplex broadcast from the display color of the mark displayed on the display element, and it is not necessary to perform a key operation to know the reception state.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating one embodiment of the present invention.

FIG. 2 is a front view showing one embodiment of the present invention.

FIG. 3 is a diagram for explaining a signal format.

FIG. 4 is a diagram for explaining a display screen.

FIG. 5 is a diagram for explaining a display screen.

[Explanation of symbols]

10 FM tuner, 11 decoder circuit, 20 CD
Player, 30 amplifier, 41L and 41R speaker, 50 microcomputer, 51 buffer memory, 52 operation keys, 60 display device, 61 color L
CD, MARK… mark

Claims (3)

[Claims] 1. A character multiplex broadcast receiver for multiplexing text program data into an original audio broadcast program signal and broadcasting the multiplexed signal, comprising: a color display element for displaying the text program. Means for displaying a predetermined mark on the color display element, wherein the display of the mark and the display color thereof are changed in accordance with the reception state of the text multiplex broadcast. 2. The text multiplex broadcasting receiver according to claim 1, wherein the text multiplex broadcasting is received when the text multiplex broadcasting is not received and when the text multiplex broadcasting is received. A text multiplex broadcast receiver is configured to determine when the text multiplex broadcast cannot be displayed and when the text multiplex broadcast can be displayed by displaying the text multiplex broadcast. 3. The text multiplex broadcast receiver according to claim 2, wherein said text multiplex broadcast receiver is combined with an audio signal reproduction device, and information on a reproduction state of said audio device is displayed on said color display element. A text multiplex broadcast receiver configured to change the display of the text multiplex mark and the display color according to a reception state.