Digital TV video and audio synchronous measuring method

A video-audio, synchronization technology, applied in the direction of TV, pulse modulation TV signal transmission, electrical components, etc., can solve the problem of the influence of the correctness of measurement accuracy adjustment, expensive dual-track digital storage reading oscilloscope and other problems, to achieve correct measurement results Reliable, avoids parallax effects, excludes effects of human influence

Active Publication Date: 2009-09-30
MUDAN SHIYUAN ELECTRONICS BEIJING
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this method is that a relatively expensive dual-trace digital storage readout oscilloscope must be used, and the measurement accuracy is affected by the oscilloscope's own scanning time base accuracy and the correctness of the reading line adjustment

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
  • Digital TV video and audio synchronous measuring method
  • Digital TV video and audio synchronous measuring method
  • Digital TV video and audio synchronous measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Digital TV video and audio synchronous test signal and measuring method that the present invention proposes are described in detail as follows in conjunction with accompanying drawing and embodiment:

[0024] The digital TV video and audio synchronous test signal graph that the present invention proposes is as follows Figure 2a , Figure 2b Shown: The video signal is a cyclic signal with full-brightness and full-dark phase jumps, the peaks indicate full brightness, and the valleys indicate full darkness, such as Figure 2a Shown in the rectangular wave curve 21. Considering that the length of the bright-dark transition interval does not affect the measurement results within a considerable range, the bright-dark transition interval can be selected from 1 / 2 to 2s according to the needs of different occasions, and the short transition interval is conducive to analog storage Oscilloscope stored waveform quality improved. Audio is a single-frequency signal that occurs in...

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 relates to a video and audio synchronization test signal of a digital TV and a measuring method thereof, and belongs to the technical field of audio and video signal detection. The test signal is composed of a video signal and an audio signal. The waveform of the video signal is a rectangular curve, forming a cycle signal with full bright and full dark phase jumps; The video light and dark transitions have the same repetition period; the time difference between the video's rising edge and the midpoint of the audio duration is the test result of the video and audio synchronization. The measurement method is to first generate image and sound data according to the requirements of the video and audio waveform of the test signal; generate video and audio basic stream data through compression coding, and form composite TS stream signal data; select the corresponding test equipment for the tested equipment; The device reads the measurement correctly. The measurement result of the invention is correct and reliable, the precision of the detection equipment itself is not high, the measurement operation is simplified, and human error can also be avoided.

Description

technical field [0001] The invention belongs to the technical field of detection of audio and video signals, in particular to a test signal and a measurement method for the synchronization of video signals and audio signals in a digital television system Background technique [0002] A TV program contains both video and audio signals. In the whole process from production and transmission to reception and reproduction, the two signals are combined in some stages, but processed separately in some stages. When they are processed separately, in principle, there is anisochronism, which reduces their synchronization, so that the action and sound are not at the same time. As for the analog TV system, the work of the circuit is real-time, and the time difference caused by the circuits of different channels is in the order of ns at most to μs. The storage and playback of TV signals involves electromagnetic processes and mechanical processes. Even if the mechanical process has a slig...

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 Patents(China)
IPC IPC(8): H04N7/54H04N17/00
Inventor 徐康兴
Owner MUDAN SHIYUAN ELECTRONICS BEIJING
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