Video signal processing method in high definition format

A video signal processing and video signal technology, applied in the direction of high-definition television systems, etc., can solve the problems of insufficient display screen, increased product cost, high resolution, etc., and realize the sampling processing of high-definition format signals and realize the potential Effect

Inactive Publication Date: 2005-11-16
SICHUAN CHANGHONG ELECTRIC CO LTD
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art processing methods for high-definition format video signals can only meet the requirements by improving the specifications of hardware equipment (digital-to-analog conversion chips) to meet the bandwidth requirements of 1080P signal format, which will increase product costs, and the general display screen It can't reach such a high resolution, even if it is fully sampled, it has no practical significance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Video signal processing method in high definition format

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] The input RGB signal or YUV signal and line and field synchronous signal first pass through the analog channel of the digital-to-analog conversion chip, and the channel is connected with the relevant pins of the sampling port of the signal identification chip. The signal recognition chip obtains the line period Hper, the field period Vper and the number of lines per frame Vtotal through the line and field interruption and the width of the time. Then use these parameters to match other parameters of the signal in the pattern table, such as the number of pixels Htotal of each row, and the signal recognition chip sets the value of the matched Htotal to the PLL register of the digital-to-analog conversion chip. It is used to set the output pixel clock frequency of the digital-to-analog conversion chip, thus completing the sampling setting of the analog signal. When the 1080P high-definition signal is input, the signal identification chip matches the Htotal value of the curr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/015
Inventor 吴久清杨金炜
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap