JPS62136184A - Teletext receiver - Google Patents

Abstract

PURPOSE:To make an operator freely and easily know the content of an optional teletext program, by detecting the number and sending and displaying form of a sending program and presence/absence of additional sound information in accordance with data contained in received teletext signals and displaying them on the screen of a CRT as an index table. CONSTITUTION:A main CPU 19 discriminates the kind of a program whether it is a collective type, complementary type, or superimposed dialogue type from program sending and displaying form (PTC) data at the time of a page data header (PACI) and program data header (PRCI) and sets each mode in a form flag. On the other hand, a sub-CPU 24 displays an index table on the screen of a CRT 7 as a service picture of sending programs when an operator makes input through an index key. The index table shows program numbers obtained from a PR table in a data memory 22 and, at the same time, the characters, graphics, and background BGC of the displayed program numbers in the index table are respectively changed in place and color in corresponding with the contents of the form flags. Then the sending and displaying form of an arriving program and presence/absence of melody are displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to technology for a teletext receiver, and more specifically, extracts a teletext signal from a multiplexed television signal on which the teletext signal is superimposed and stores the teletext signal in a data memory. By sequentially storing the data stored in the data memory, converting it into output data, and providing it to the CRT and speaker, the contents of the teletext signal can be displayed on the screen of the CRT, and additional sound information can be transmitted from the speaker. The present invention relates to a teletext receiver configured to be able to output.

<Prior Art> Such a teletext receiver utilizes the vertical blanking period of a television video signal to receive an encoded teletext signal transmitted in data packets whose unit length is the horizontal scanning period. is received, and the characters and simple graphic information included in the teletext signal are played back and displayed on the CRT screen, and if there is additional sound information (melody), the additional sound information can be output from the speaker. It is what was done.

By the way, in such hybrid teletext broadcasting, various transmission/display formats as described below are used in order to accommodate a wider range of teletext programs.

One of these is the batch program type, in which all pages of a program are sent out at once and stored in memory, and the pages can be turned at will according to the operator's will (for example, used for stock information, cooking ingredient lists, etc.) The other type is the complementary program type, which sends out a text screen that complements the currently airing TV program (for example, it is used for cooking ingredient lists, quiz answers, etc.). One is the so-called subtitle program type, in which the display timing is synchronized with the TV image and superimposed (for example, used to superimpose subtitles on drama programs or superimpose lyrics on popular music programs), and others are not currently implemented. It is expected that even more diverse transmission and display formats will be considered and put into practical use in the future.

In addition, in hybrid teletext broadcasting, additional sound information (
It is also possible to send out melodies (melody), and there are music programs and the like.

However, despite the various convenient and effective transmission/display formats and transmission of additional sound information as mentioned above being carried out on the transmitting side of teletext programs, the operator on the receiving side does not know which program to watch. What kind of broadcasting program is the number broadcasting?
At present, there is no way to easily and arbitrarily find out whether it is in the display format or whether there is additional sound information, and therefore, it is necessary to actually receive and display the teletext program. However, there was an inconvenience in that it was not possible to check the transmission/display format of the program and the presence or absence of additional sound information.

<Object of the Invention> The present invention has been made in view of the above-mentioned conventional situation, and its object is to enable an operator to freely control the transmission/display format of any teletext program and the presence/absence of additional sound information. To provide a teletext receiver equipped with a convenient function capable of displaying a service screen that can be easily understood.

<Configuration of the Invention> In order to achieve the above object, the present invention has the following configuration.

That is, the teletext receiver according to the present invention has the basic configuration as described at the beginning, and based on the data included in the received teletext signal, the teletext receiver determines the broadcast program number,
The type of transmission/display format and the presence or absence of additional sound information may be detected, and information indicating the detected broadcast program number, the type of transmission/display format, and the presence or absence of additional sound information may be displayed as an index table on the screen of the CRT. It has the feature that it is structured as follows.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a block diagram showing the circuit configuration of a teletext receiver according to an embodiment of the present invention.
A receiving section 2 of a normal television receiver that performs F amplification and detection, and a video signal processing section 3 of a normal television receiver that extracts and processes a video signal from a composite video signal output from the receiving section 2. , the audio signal processing section 4 of a normal television receiver that similarly extracts and processes the audio signal from the composite video signal, the teletext signal processing section 5, which will be described in detail later, and the television obtained by the video signal processing section 3. a video switching circuit 6 for switching between a television video signal and a teletext signal obtained by the teletext signal processing section 5; a CRT (cathode ray tube) 7; a drive circuit 8 for driving the CRT 7; and the audio signal processing section. an audio switching circuit 9 that switches between the audio signal obtained in step 4 and the additional audio signal (melody) obtained in teletext signal processing section 5; and an audio amplification circuit 10.
It is equipped with a speaker 11.

The teletext signal processing section 5 includes a waveform equalization data extracting circuit 12 into which the output of the receiving section 2 is introduced, a clock pulse generation circuit 13, a synchronization signal generation circuit 14, and a framing detection identification circuit 15. A surface difference conversion/error correction circuit 16, a capture bass amplifier 17, a display clock generation circuit 18, a main CPU 19, and its main CPU
Program ROM 20 for UI 9 and main C
A work RAM 21 for the PU 19 and a data memory 22 that stores required data of the extracted teletext signal.
, a timing control circuit 23 for the data memory 22, a sub CPU 24, a program ROM 25 for the sub CPU 24, and a work RA for the sub CPU 24.
It consists of an M26, a display controller 27, a display memory 28, a matrix circuit 29, an audio decoder 30, a kanji ROM 31, an interface circuit 32, a remote control receiver/keyboard 33, and a printer 34. Note that 35... indicates a data bus, and 36... indicates an address bus.

A more detailed explanation of the operation of the teletext signal processing section 5 is as follows.

First, the television signal obtained from the receiving section 2 is
The signal is supplied to a waveform equalization data extraction circuit 12, which slices it into an appropriate level and shapes the waveform, and extracts the teletext signal.

The extracted teletext signal is converted from a serial signal to a parallel signal in a tray conversion/error correction circuit 16, and after errors are corrected, it is temporarily stored in a capture buffer 17. At this time, it is necessary to synchronize the teletext signal with the tray conversion in the tray conversion/error correction circuit 16, so the clock pulse generation circuit 13 and the framing detection and identification circuit 15 synchronize in bits and bytes. Be taken.

The teletext signal stored in the capture buffer 17 is judged by the main CPU 19 for framing detection errors, error correction errors, etc., and the presence or absence of data identification codes and reservations, and only the necessary data is transferred and stored in the data memory 22. be done.

On the other hand, the sub CPU 24 decodes the data (character code) taken in by the main CPU 19 and performs drawing processing and audio reproduction processing.

Regarding the drawing process, the sub CPU 24 calculates the address in the kanji ROM 31 from the character code stored in the data memory 22, sequentially transfers each character pattern and its display address to the display controller 27,
Accordingly, the display controller 27 sets the character pattern in the display memory 28. At this time, in order to synchronize with the television image, synchronization is achieved by the display clock generation circuit 18 and the synchronization signal generation circuit 14, and the signal is outputted to the video switching circuit 6 via the matrix circuit 29. As a result, the required character pattern is displayed on the CRT 7.

Regarding audio reproduction processing, audio data is output to the audio decoder 30, converted into audio (melody) by the audio decoder 30, and output to the audio switching circuit 9. This reproduced sound is output to the speaker 11 through the amplifier 10.

Note that switching of access to the data memory 22 between the main CPU 9 and the sub CPU 24 is performed by a timing switching circuit 23.

Next, according to the gist of the present invention, when a teletext signal is captured, the transmission program number, transmission/display format, and presence or absence of additional sound information are detected, and the detection results are displayed in an index table as a display screen. An example will be explained based on the import processing flowchart in FIG. 2, the program number (abbreviated as PR) table example in FIG. 3, and the index table example in FIG. 4.

The acquisition processing flowchart shown in FIG. 2 is executed by the main CPU 19 described above, and the teletext signal superimposed on the vertical retrace period is extracted, and after error correction, this processing routine is entered.

That is, in this processing routine, first, it is confirmed that it is a teletext signal in step (2), and then steps (2),
In the flows of ■, ■, ■, ■, a page data header (abbreviated as PACI), three program data headers (PRCI
From the program transmission/display format data (abbreviated as PTC), determine the type of program (all-in-one program type, supplementary program type, 3 subtitle program types), and set each mode in the format flag described later. Also, step ■, ■, ■, ■, ■, [phase]
In this flow, the presence or absence of additional sound information such as a music program is determined based on the data unit identification code at the beginning of the data block code string, the mode is set in the format flag described later, and each import process is performed.

PR child table exemplified in the third circle, sending programs as sub CP
The main CPIJ 19 registers program index data unit (PIDU) data that arrives after the program index data header (PICI).

In other words, for one program, the magazine number (P
RG) and the 100th position of the program number (abbreviated as PRI), the 10th position of the program number (abbreviated as PH1) and the 1st position of the program number (abbreviated as PH3) in the second byte, and The program transmission/display format (PTC) is registered in the lower 4 bits of the 3rd byte, and the upper 4 bits of the 3rd byte are assigned as format flags to batch program type, supplementary program type, 1 subtitle program type, and additional sound information. , after detecting each.

On the other hand, the sub CPU 24 manually clicks the "index" key by the operator to create an index table for the broadcast program as a service screen.
The index table is displayed on the screen of T7, but the index table is
As illustrated in the figure, at the same time as displaying the program number obtained from the PR child table in the data memory 22, the character/graphic background color (BGC) of the displayed program number in the index table is changed according to the content of the format flag. The transmission/display format of the incoming program and the presence/absence of additional sound information (melody) are displayed by changing the location and color of the incoming program.

<Effects of the Invention> As is clear from the above detailed description, the teletext receiver according to the present invention can determine the broadcast program number, transmission/display format, etc. based on the data included in the received teletext signal. The system is configured to detect the type and the presence or absence of additional sound information, and to display the detected broadcast program number, the type of transmission/display format, and information indicating the presence or absence of additional sound information as an index table on the screen of the CRT. Therefore, by simply displaying the above-mentioned index table as a service screen at will, the operator on the receiving side can check not only the program number of the teletext broadcast program, but also the type of transmission/display format and the presence or absence of additional sound information. This makes it easy to check, and as a result, very effective guidelines can be obtained for selecting teletext programs, and convenient and effective transmission/display formats and additional sound implemented on the transmission side of teletext programs can be easily checked. The excellent effect of being able to fully enjoy the benefits of information has come to fruition.

[Brief explanation of drawings]

The drawing shows an embodiment of a teletext receiver according to the present invention,
Figure 1 is a block circuit diagram showing the overall schematic circuit configuration;
The figure is a capture processing flowchart to explain the transmission program number, transmission/display format, and detection operation for the presence or absence of additional sound information when capturing a teletext signal. Figure 3 shows the program number (PR) related to the capture process. Table Example and FIG. 4 is a display example of an index table as a display service screen. 7...CRT. 11...Speaker, 19...Main CPU. 22...Data memory, 24...Sub CPU.

Claims (1)

[Scope of Claims] A teletext signal is extracted from a multiplexed television signal on which the teletext signal is superimposed, sequentially stored in a data memory, and the data stored in the data memory is read out and converted to output data and transmitted to a CRT. and a speaker, in a teletext receiver configured to display the contents of the teletext signal on the screen of the CRT and output additional sound information from the speaker, the content contained in the received teletext signal. Based on the data, the broadcast program number, the type of transmission/display format, and the presence or absence of additional sound information are detected, and the information indicating the detected broadcast program number, the type of transmission/display format, and the presence or absence of additional sound information is
A teletext receiver characterized in that it is configured to display an index table on an RT screen.