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Method for obtaining line synchronization information items from video signal, and aparatus for carrying out the method

A video signal and line synchronization technology, applied to color TV parts, TV system parts, TVs, etc., can solve the problems of video signal noise component suppression, not good enough, etc., and achieve the effect of improving image quality

Inactive Publication Date: 2004-10-20
DEUTSCHE THOMSON-BRANDT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this solution is that although the reduction of the time constant of the phase-locked loop makes the degree of interference lighter than when the time constant is large, the noise component in the video signal is not suppressed well enough, and the interference line can still be seen.

Method used

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  • Method for obtaining line synchronization information items from video signal, and aparatus for carrying out the method
  • Method for obtaining line synchronization information items from video signal, and aparatus for carrying out the method
  • Method for obtaining line synchronization information items from video signal, and aparatus for carrying out the method

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Embodiment Construction

[0032] figure 1 An analog value showing the position of the horizontal sync pulse of the video signal. The numbering of each row along figure 1 The direction of the abscissa is drawn. Inverse 1 / f of the current horizontal frequency of the horizontal sync pulse H along figure 1 Draw in the direction of the ordinate. The line number of each video line is usually indicated by the letter n. Plotting the reciprocal of the current horizontal frequency means that the time domain positions of the sync pulses of the individual lines are comparable to each other. Values ​​corresponding to the measured values ​​at various positions of the horizontal sync pulse are indicated by vertical dashed lines. The end of each vertical dashed line represents the determined horizontal sync pulse position. If the video signal were ideal, all dashed lines would be the same length. This is a description relative to the video signal produced by the camcorder. exist figure 1 The fluctuation of t...

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Abstract

A method for obtaining line synchronization information items from a video signal is proposed. To that end, the following improvement measures are proposed: a) an accurate determination of the position of a line synchronization pulse is effected by carrying out a convolution operation between the video signal for the video line and a pattern function. The exact position is then established by analysis of the result function (phi [SV] (k)) of the convolution operation. B) time-domain filtering of the established positions of the line synchronization pulses is carried out, in which a linear or non-linear estimation for the purpose of determining the corrected positions of the line synchronization pulses is carried out in each case. The invention also relates to an apparatus for carrying out the method.

Description

technical field [0001] The invention relates to a method for obtaining an item of line synchronization information of a video signal and also to a device for implementing the method. Background technique [0002] The invention is based on a method of a general type for obtaining items of line synchronization information from a video signal. Even though digital system solutions will become more and more prominent in future TV technology, there will still be analog source signals for many years to come. Examples of analog source signals include terrestrial reception of video signals which are still widely available, and in the case of VCRs analog recording methods such as according to the VHS standard. Such analog signal sources represent critical signal sources for digital systems, and their signal processing requires special means. [0003] Until now, television receivers with digital signal processing (for example in the case of 100 Hz technology) usually operated by mean...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/08H04N5/05H04N5/10
CPCH04N5/10
Inventor 罗兰·拉里斯阿尔布雷克特·罗瑟梅尔
Owner DEUTSCHE THOMSON-BRANDT GMBH