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Digital information signal regeneration method and digital information signal decoder

A technology of digital information and signal regeneration, applied in the direction of digital non-picture data transmission, simultaneous/sequential multi-TV signal transmission, image communication, etc., can solve the problems of the microcomputer processing speed cannot be realized, and achieve the effect of suppressing the effect of phase distortion

Inactive Publication Date: 2003-10-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, it is impossible to realize these series of processes within 20 ms of one vertical retrace line period of the PAL system at the processing speed of a microcomputer used in consumer equipment.

Method used

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  • Digital information signal regeneration method and digital information signal decoder
  • Digital information signal regeneration method and digital information signal decoder
  • Digital information signal regeneration method and digital information signal decoder

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Experimental program
Comparison scheme
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Embodiment Construction

[0033]Embodiments of the present invention will be described below with reference to the drawings.

[0034] In addition, here, the case of teletext will be described as an example in which a digital information signal is superimposed and transmitted during a retrace line period of a TV signal.

[0035] (first embodiment)

[0036] figure 1 It is a diagram showing the configuration of a teletext decoder as a digital information signal decoder according to the first embodiment of the present invention. exist figure 1 Among them, 11 is the A / D converter that A / D converts the TV signal during the retrace line period, 12 is the synchronous separation circuit that separates the horizontal synchronous signal HSYNC and the vertical synchronous signal VSYNC from the TV signal, and 20 is the channel selection circuit Microcomputer processing part. The channel selection microcomputer processing section 20 includes a RAM 21 for storing digital data generated by the A / D converter 11, ...

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PUM

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Abstract

In reproduction of a transmitted digital information signal superimposed on the retrace line period of a TV signal, the influence of phase distortion in the transmission line is suitably suppressed by a simple method. The TV signal during the retrace line is sampled by the A / D converter 11 using a frequency fs higher than the transmission frequency ft of the teletext signal. The CPU 22 executes the program stored in the ROM 24 , and calculates the first address where the sign of the difference is reversed by taking the difference from the digital data stored in the RAM 23 via the RAM 21 and the slice value. Then, the sampling timing of the teletext signal is determined according to the result of comparison with the second address indicating the timing under ideal conditions.

Description

technical field [0001] The present invention belongs to the technique of reproducing digital information signals such as teletext and closed captions which are superimposed and transmitted during a retrace line period of a TV signal. Background technique [0002] Teletext and closed captioning are such services, which use binary digital signals to superimpose text and graphic information into image signals during the vertical retrace line of the TV signal and then send them out. On the receiving side, through the built-in After the decoding circuit in the receiver selects and reproduces the data, the screen displays the sent text and graphic information. [0003] In the case of teletext, since the image signal is superimposed with the transmission clock frequency Ft (6.9375MHz) and sent out, it is necessary to perform sampling at the clock frequency Fs synchronized with the transmission clock frequency Ft on the receiver side. For this reason, a CRI (Clock Run-in) signal of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/025H04N7/03H04N7/035
CPCH04N7/035
Inventor 师冈孝治
Owner PANASONIC CORP