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Digital information signal regeneration method and digital information signal decoder

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

Inactive Publication Date: 2005-09-07
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] Embodiments of the present invention will be described below with reference to the drawings.

[0032] 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.

[0033] (first embodiment)

[0034] 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, a...

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PUM

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Abstract

The objective of this invention is to adequately suppress the influence of phase distortion of a signal on a transmission line by a simple system when a digital information signal which is superposed and transmitted in blanking periods of a TV signal is reproduced. The TV signal in blanking periods is sampled by an A / D converter at a frequency fs higher than the transmission frequency (ft) of a teletext signal. A CPU 22 executes a program stored in a ROM 24 to obtain the difference of digital data stored in a RAM 23 from a slice value through a RAM 21 and calculate a first address where the sign of the difference is inverted. Then the first address is compared with a second address representing timing under ideal conditions and according to the comparison result, the sampling timing of the teletext signal is determined.

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 Patents(China)
IPC IPC(8): H04N7/025H04N7/03H04N7/035
CPCH04N7/035
Inventor 师冈孝治
Owner PANASONIC CORP