JPH05328320A - Television receiver with built-in teletext broadcasting decoder - Google Patents

Abstract

PURPOSE:To extract information to the external, to work and edit the extracted information and to effectively utilize the edited information by outputting character data whose format is converted by a format conversion part into an external computer through an interface part. CONSTITUTION:A personal computer 10 is connected to an RS232C interface part 8 through an RS232C interface cable 9. A TV signal including closed caption character information separates a caption signal multiplexed to a line for the original TV signal by a video intermediate frequency part 3 through an antenna 1 and a tuner part 2. The separated caption signal is demodulated by a closed caption decoder 6 as an ASCII code, which is led into a video signal demodulating part 4 and displayed on a receiving part 5. On the other hand, the demodulated ASCII code information is converted into a reference ASCII format by a format conversion part 7 by removing a control code from the ASCII code. The character information is sent to the computer 10 through the interface part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver with a character multiplex broadcast decoder.

[0002]

2. Description of the Related Art With the recent remarkable development of television broadcasting technology, it has become possible to superimpose signals for various services on television broadcasting signals. One of them is teletext broadcasting. It is called teletext in Japan, teletext in Europe, and closed captioning in the United States.
In each case, the format of the signal is different. At present, the aim is to provide new services for the hearing impaired or independent.

[0003]

The above-mentioned character information is not limited to simply replacing lines and words with characters.
News, stock information, weather forecast, cooking program menu,
There is a lot of useful information, such as lyrics of song programs, that can be extracted, processed, edited, and reused. But there was no way to do this. The present invention has been made to solve the above problems, and provides a television receiver with a computer interface and a character multiplex broadcast decoder for reusing character information of the character multiplex broadcast in a personal computer. To aim.

[0004]

As a means for solving the above-mentioned problems, the present invention is a television receiver having a built-in decoder for a character multiplex broadcasting, which comprises a format conversion section for converting the format of the character data. And an interface unit for outputting the character data whose format has been converted to an external personal computer, and the personal computer can be connected to the outside of the television receiver via the interface. To do.

[0005]

A personal computer is connected to the television receiver with the character multiplex broadcast decoder. The television receiver is in a character multiplex broadcast receiving state. The TV signal containing the character information is separated into the original TV video signal and the character signal inside the TV receiver. The separated character signal is demodulated as character information by the character multiplex broadcasting decoder,
Processing for displaying on the display is performed. Here, the demodulated character information is converted into a character format that can be understood by a personal computer by a format conversion unit according to the present invention and sent to an interface unit for outputting to the outside of the television receiver. The interface unit outputs the character information under the condition that matches the interface condition with the externally connected personal computer. This condition includes transfer rate, data bit length,
It includes parity, stop bit, and Xon / Xoff control methods. The user operates the personal computer and once stores the character information received from the television receiver in the memory of the computer. The character information stored in the memory of the personal computer can be effectively used by saving it on a magnetic disk, editing it by a word processing function of the personal computer and printing it out, or making it into a database, if necessary.

[0006]

Embodiments of the present invention will be described in detail with reference to the drawings. The present embodiment will be explained by applying it to a television receiver having a built-in decoder for closed captioning which is US character multiplex broadcasting.

First, the closed caption broadcasting system will be described. As shown in FIG. 2, the caption information is multiplexed on the 21st scanning line (hereinafter abbreviated as line 21) of the video signal. United States NCI (Nationala
In the caption broadcasting format defined by the l Captioning Institute, line 21
The method of multiplexing the caption information is defined as the field 1 mode, and the method of multiplexing the caption information on the line 284 is defined as the field 2 mode. In 1976, the US FCC (Federal Communications Commission) allocated line 21 for subtitled broadcasting. Currently, only the field 1 mode is used in the United States.

FIG. 3 shows a multiplexed signal of character information. The data is 16-bit NRZ (Non Return to
zero) signal. There is a clock run-in signal of 7 cycles as a synchronization signal for decoding the data code,
Its frequency is 503 KHz. The clock run-in signal and the data code are in phase with each other. After the clock run-in signal, there are 2 bits of logic level 0, followed by 1 bit of start bit (theoretical level 1). The breakdown of 16-bit data is two combinations of a 7-bit ASCII code and a 1-bit parity code. Character code is based on ASCII code,
Code for specifying character attributes for closed captions and code for controlling the screen have been added. There are 112 types of character codes determined by the standard.

FIG. 1 is a block diagram of a television receiver which is an embodiment of the present invention. In this block diagram, only the portion related to the present invention is shown, and the audio processing relation is omitted. Here, 1 is an antenna, 2 is a tuner section, 3 is a video intermediate frequency section, 4 is a video signal demodulation section, 5 is a receiving section, 6
Is a closed caption decoder unit, 7 is a format conversion unit, 8 is an RS232C interface unit, 9
Is an interface cable for RS232C, and 10 is a personal computer.

Next, the operation of the television receiver with the character multiplex broadcast decoder will be described. Personal computer 10
Is connected to the RS232C interface unit 8 via the RS232C interface cable 9 in advance. The television receiver is in a closed caption broadcast receiving state. The television signal including the closed caption character information is separated from the caption signal multiplexed on the line 21 of the original television video signal by the video intermediate frequency unit 3 via the antenna 1 and the tuner unit 2. The separated caption signal is demodulated as an ASCII code by the closed caption decoder 6, guided to the video signal demodulation unit 4, and processed for display on the reception unit 5.

Here, the demodulated ASCII code information is converted into a standard ASCII format by separately removing the character code and the control code for controlling the screen from the ASCII code for closed caption in the format conversion unit 7. The character information converted to ASCII format is RS23 for output to the outside of the television receiver.
It is sent to the 2C interface unit 8. The RS232C interface section 8 outputs an ASCII code under a predetermined condition that matches the interface condition with a personal computer connected to the outside. This condition includes transfer rate, data bit length, parity,
Stop bit and Xon / Xoff control methods are included.

The user operates the personal computer 10 to once store the ASCII format character information received from the RS232C interface section 8 of the television receiver via the RS232C cable 9 in the memory of the personal computer 10. The character information stored in the memory of the personal computer 10 can be effectively utilized by storing it on a magnetic disk as necessary, editing it with a word processor function of the personal computer 10 and printing it out, or making it a database. it can.

In the present embodiment, the television receiver having the closed caption decoder for the United States built therein has been described, but the format conversion unit 7 can also be applied to the television receiver for teletext for Japan and the teletext for Europe. It can be easily applied only by the difference. Furthermore, the RS232C interface section 8 of the television receiver is
Not limited to S232C, it is also possible to use a general-purpose personal computer interface such as Centronics.

[0014]

EFFECTS OF THE INVENTION According to the present invention, not only lines and words, but also a lot of character information such as news, stock information, weather forecast, menu of cooking program, lyrics of song program, etc. can be taken out and processed and edited. Can be used effectively.
Furthermore, there is the possibility of the provision of entirely new services, which are premised on the connection to personal computers. In the present invention, all the devices according to the present invention except the personal computer are built in the television receiver, so that they are extremely compact.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a multiplexing position of a closed caption signal on a scanning line.

FIG. 3 is a detailed diagram of a closed caption signal.

[Explanation of symbols]

 1 Antenna 2 Tuner Section 3 Video Intermediate Frequency Section 4 Video Signal Demodulation Section 5 Reception Section 6 Closed Caption Decoder Section 7 Format Conversion Section 8 RS232C Interface Section 9 RS232C Cable 10 Personal Computer

Claims (1)

[Claims] 1. A television receiver having a character multiplex broadcasting decoder built-in, comprising a format conversion unit for converting the format of the character data and an interface unit for outputting the format-converted character data to an external computer. And a television receiver with a character multiplex broadcast decoder.