Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for detecting types of subcarrier of SECAM video signal

A video signal and subcarrier technology, applied in the field of television, can solve the problems of high complexity, achieve the effect of reducing complexity, strong practicability, and simple implementation

Inactive Publication Date: 2007-12-26
VIMICRO CORP
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a method and device for detecting subcarrier types of SECAM video signals to solve the problem of high complexity in detecting the subcarrier types of SECAM video signals in the prior art

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
  • Method and device for detecting types of subcarrier of SECAM video signal
  • Method and device for detecting types of subcarrier of SECAM video signal
  • Method and device for detecting types of subcarrier of SECAM video signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] In the embodiment of the present invention, the FM ratio demodulation circuit is used to demodulate the color burst signal of the current row scanning line, and the frequency of the color burst signal of the current row scanning line is obtained according to the demodulation result, and the frequency is corresponding to the obtained red difference signal The subcarrier of the blue color difference signal is compared with the intermediate frequency of the subcarrier corresponding to the blue difference signal, and the type of the subcarrier of the current scanning line is determined according to the comparison result, thereby reducing the complexity of detection.

[0037] The method of the embodiment of the present invention is based on the following considerations:

[0038] When the SECAM video signal is transmitted, each scanning line corresponds to a type of subcarrier. If a scanning line transmits a red difference signal (R-Y), the scanning line corresponds to a subca...

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 method comprises: using FM ratio demodulation circuit to demodulate the current row-scan-line color sync signals; according to the demodulation result, getting the frequency of current row-scan-line color sync signals; getting the intermediate frequency between the subcarrier corresponding to the red color difference signal and the subcarrier corresponding to the blue color difference signal; comparing the frequency of current row-scan-line color sync signal with said intermediate frequency; according to the comparison result, determining the type of current row-scan-line subcarrier. The invention also reveals an apparatus thereof.

Description

technical field [0001] The invention relates to the field of television technology, in particular to a method and a device for detecting the subcarrier type of a SECAM video signal. Background technique [0002] SECAM (Séquential Couleur a Mémoire, sequential transmission color and storage) system is one of the analog color TV systems. The difference from other analog color TV systems is that the red difference signal (R-Y) and the blue difference signal (B-Y) are transmitted line by line. ). Since only one color-difference signal exists in the transmission channel at the same time, the cross-talk phenomenon of color-difference signals is avoided. [0003] Since the red difference signal (R-Y) and the blue difference signal (B-Y) use subcarriers of different frequencies for FM modulation, the red difference signal (R-Y) uses a subcarrier F with a frequency of 440MHz OR For FM modulation, the blue difference signal (B-Y) uses a subcarrier F with a frequency of 425MHz OB FM...

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): H04N9/45
Inventor 张幼京桂文明
Owner VIMICRO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com