JP2986002B2 - Teletext broadcast recording and playback system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing method for recording a subtitle program of teletext broadcasting.

[0002]

2. Description of the Related Art In television broadcasting, for people with hearing impairment, text information for explaining the contents of a program or the like is generated in a required text broadcasting signal, and is superimposed on a video signal and broadcast as a subtitle program. In some cases, when this is received by a teletext receiver, it can be displayed on a screen during image reception. However, if you are trying to watch such a subtitled program for the deaf at times other than broadcast hours,
(1) A method of recording a television broadcast signal in a commercial VTR and decoding and displaying the broadcast signal through a tape reproduction and a teletext decoder later; VTR for
There are two possible ways of recording. However, the method (1) has a problem that the price of the commercial VTR is expensive, and if the home VTR is used instead of the commercial VTR, the S / N ratio is poor and the frequency characteristics are poor.
Moiré, waveform distortion, dropout, etc. occur, which is not practical. In addition, the method (2) is economical (the subtitle broadcast decoder needs to select a subtitle program by turning on the power.) And is inconvenient (for a healthy person, watching only the subtitle screen is possible). This is inconvenient if one wants to watch a normal program.)
(Characters are difficult to see by limiting the band of the G and B signals to the NTSC signal).

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-mentioned problem (2). It is to provide a device.

[0004]

According to the present invention, there is provided a tuner section for receiving a television broadcast, demodulating the video signal into a video signal, and outputting the video signal, and a video demodulated by the tuner section. A character extracting unit for extracting a teletext signal superimposed in the vertical flyback period from the signal, an error correcting unit for correcting an error of the teletext signal extracted by the character extracting unit, and a character from the error correcting unit. A memory for recording broadcast signals,
A decoder section for reading data recorded in the memory section and decoding the data into a required character signal; and a control section for reading data recorded in the memory section and converting the data into real-time information by a timer. , To switch the subtitle characters.

[0005]

As described above, in the teletext recording / reproducing method according to the present invention, the decoder sets the subtitle program page data, page transmission time data, and page transmission time interval data together with the corresponding flags. During the signal processing, the subtitle screen page display time (display switching time to the next screen) is stored in the memory, and the subtitle program page data transmission time data stored in the memory is stored in the memory.
Further, the control unit calculates an actual time by a timer based on the transmission time interval data, and performs a display screen switching process based on the calculated time.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a teletext recording / reproducing system according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a main part of an embodiment of a teletext recording / reproducing system according to the present invention. In the figure, reference numeral 1 denotes a tuner section inside a teletext decoder, which receives a television broadcast, demodulates it into a video signal, and outputs it. Reference numeral 2 denotes a character extracting unit, and the tuner unit 1
A teletext signal superimposed during the vertical flyback period is extracted from the video signal demodulated in step (1). Reference numeral 3 denotes an error correction unit that corrects errors in the teletext signal extracted by the character extraction unit 2. Reference numeral 4 denotes a memory for recording the teletext signal from the error correction unit 3. Reference numeral 5 denotes a decoder section for reading data recorded in the memory section 4 and decoding the data into a required character signal. The control unit 6 reads data recorded in the memory unit 4 and extracts time information by the timer 7.

Next, the operation of the teletext recording / reproducing system having the above configuration will be described. Only the subtitle program in the teletext broadcasting is transmitting the character data in synchronization with the television signal on the broadcasting side. Therefore, when the subtitle program is recorded, the subtitle program is broadcast when the subtitle program is recorded, as shown in FIG. The signal of the television channel is received by the antenna 21 and the VTR 22
And the teletext decoder 23 extracts subtitle program page data from the signal of the recorded television channel and stores it in the memory (the subtitle program data is identified by the header data of the program data. At the time of reproduction, the teletext decoder 22 stores the contents in the internal memory on the screen of the monitor 24 obtained by reproduction by the VTR 23, as shown in FIG. The subtitle screen data obtained by decoding the subtitle page data being displayed is synthesized and displayed.

The data processed by the above operation is:
As shown in FIG. 3, the teletext decoder sequentially stores the page data 33, 34 and the like included in the teletext signal 31 in its internal memory along the flow of time indicated by the arrow 32, Transmission time data 3 of each subtitle program page included in block 38
6 and the transmission time interval data 37, but are stored simultaneously. Also, a flag for identifying the type of the stored data is stored. This corresponds to, for example, the flag 3 in the figure.
9 indicates page data, a flag 40 indicates transmission time data of the subtitle program page, and a flag 41 indicates transmission time interval data of the subtitle program page. The data stored in this way is the same as the page display time of the subtitle screen during the signal processing (the display switching time to the next screen), the transmission time data of the page data of the subtitle program stored in the memory, and the transmission time interval data. The control unit calculates the actual time by the timer based on the above, and performs the switching processing of the display screen based on the calculated time. Note that the first synchronization at the time of reproduction for adjusting the reproduction screen (television signal) of the VTR and the subtitle information of the teletext is performed at the time when reproduction is started by the user operating a remote controller or the like. . Further, according to the present invention, when a normal person plays back and views a recorded VTR, if the teletext decoder is turned off, the decoding process is stopped, whereby subtitles on the television screen can be erased. In addition, during the special playback operation of the VTR (fast forward / rewind / stop / slow playback / double speed playback, etc.), the adjustment is performed by changing the real time position of the page data of the subtitle program stored in the memory (after the broadcast time starts). The data indicating the time position) can be processed in accordance with the display time (tape position) of the timer counter displayed on the VTR.

[0009]

As described above, according to the teletext recording / reproducing method of the present invention, a desired subtitle program is
In addition to recording the subtitle page data in the TR, the subtitle page data is stored in the teletext decoder, and the subtitle page data stored in the teletext decoder is read out at the time of cueing at the time of VTR reproduction, and converted into predetermined real-time data. , Said note V
Since it can be displayed on the monitor in synchronization with the image of the TR, it is possible to reproduce a captioned program without a gap between the caption and the video.

[Brief description of the drawings]

FIG. 1 is a block diagram of a teletext recording / reproducing method according to the present invention.

FIG. 2 is an explanatory diagram of recording and reproduction of a teletext recording and reproduction system according to the present invention.

FIG. 3 is a diagram showing a data format of a teletext recording / reproduction system according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tuner part 2 Character extraction part 3 Error correction part 4 Memory 5 Decoder part 6 Control part 7 Timer

Claims (1)

(57) [Claims] 1. A tuner section for receiving a television broadcast, demodulating it into a video signal, and outputting the video signal, and extracting a character broadcast signal superimposed in a vertical blanking period from the video signal demodulated by the tuner section. And an error correction unit for performing error correction on the teletext signal extracted by the character extraction unit;
A memory for recording the teletext signal from the error correction unit, a data unit for reading data recorded in the memory unit, and a decoder unit for decoding the data to a required character signal; and a data unit for reading the data recorded in the memory unit. It is composed of a control unit that converts to real time information and switches the subtitle characters ,
The control unit is a subtitle program page stored in the memory unit.
Data transmission time data and transmission time interval data
The real time is extracted by the timer based on
A teletext recording / reproducing method characterized by sequentially switching readout of corresponding page data .