Video signal processing method in high definition format

Abstract

The invention solves issue that when processing video signal in high definition resolution, the bandwidth of D / A conversion chip is not large enough to realize display of video signal. Technical scheme is as following: in sampling procedure of video signal process, if clock frequency of video signal pixels Fv is larger than maximum value Fc of output pixel clock frequency of D / A conversion chip, then, Htotal value is reduced to lower Fv, making Fv equal to or less than Fc. Then, according to reduced Htotal value, sampling is carried out to video signal. The invention realizes signal-sampling process in high definition resolution format. The invention is mainly applicable to TV set for processing signal in high definition resolution format.

Description

technical field

[0001] The invention relates to a video signal processing technology, in particular to a method for digital-to-analog conversion of a video signal. Background technique

[0002] With the continuous development of video technology, the resolution of video signals has been greatly improved, from 480i to 1080P or even higher. This requires a corresponding increase in the input bandwidth of the receiving device. However, the digital bandwidth used for the digital-to-analog conversion chip in many systems generally cannot meet the requirements. For example, the commonly used digital-to-analog conversion chip, its output pixel clock The maximum frequency is Fc=140MHz. For 1080P signal (1920×1080@60HZ), the pixel clock frequency Fv=Hfreq×Htotal=Vtotal×Vfreq×Htotal=1125×60×2200=148.5MHz, which exceeds the range supported by the digital-to-analog conversion chip . Therefore, the system bandwidth is clearly insufficient for full sampling. However, the output of man...

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