Digital TV video and audio synchronous testing signal and measuring method thereof

An audio signal and test signal technology, which is applied in the direction of pulse modulation TV signal transmission, TV, electrical components, etc., can solve the problems of the correctness of measurement accuracy adjustment, expensive dual-trace digital storage reading oscilloscope, etc., to achieve correct measurement results Reliable, parallax-free, and artifact-free effects

Active Publication Date: 2007-08-22
MUDAN SHIYUAN ELECTRONICS BEIJING
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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

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  • Digital TV video and audio synchronous testing signal and measuring method thereof

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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 video and audio synchronous test signal pattern of the digital TV that the present invention proposes is as shown in Figure 2a, Figure 2b: the video signal is the cyclic signal of all-brightness and full-dark phase transition, and the crest represents all-brightness, and the wave trough represents all-darkness, as shown in Fig. 2a rectangle Wave curve 21 is shown. 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 o...

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Abstract

A method for measuring synchronism of audio / video on digital TV includes generating image and sound data according to requirement of test signal audio / video waveform, generating audio / video basic stream data by compressing code and forming composite TS stream signal data, selecting test device corresponding to tested device and using detection device to fetch out measurement result correctly. The test signal applied in said method is also disclosed.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/54H04N17/00
Inventor 徐康兴
Owner MUDAN SHIYUAN ELECTRONICS BEIJING
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