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Audio/video transmission method and device

A technology of video transmission and transmission method, which is applied in the field of audio and video transmission methods and devices, and can solve problems such as the inability to realize synchronous transmission of audio and video.

Active Publication Date: 2016-08-03
ZHEJIANG UNIVIEW TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides an audio and video transmission method and device to solve the problem in the prior art that synchronous transmission of audio and video cannot be achieved when twisted pair wires are used to transmit high-definition video

Method used

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  • Audio/video transmission method and device

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Embodiment Construction

[0029] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the structure of an Ethernet MAC (MediaAccessControl, Media Access Control) frame will be briefly described below.

[0030] In the Ethernet standard protocol, the MAC frame needs to include frame gap, preamble, SFD (StartFrameDelimiter, frame delimiter), destination address, source address, type, data, and CRC (CyclicRedundancyCode, cyclic redundancy code check), etc. Field, its format diagram can be as follows Figure 1A shown; where:

[0031] The length of the frame gap field is 12 bytes, which is used to absorb the clock deviation of the sender;

[0032] The length of the preamble + SFD field is 8 bytes in total, which is used to determine the start of the Ethernet frame;

[0033] The length of the target address field is 6 bytes, which is used to identify the target address of the device;

[0034] The length of the source address fi...

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Abstract

The invention provides an audio / video transmission method and device. The method comprises following steps of determining the minimum length of video fields in MAC (Media Access Control) frames according to the total length of the MAC frames and a preset video transmission efficiency threshold value; determining the minimum length of audio fields in the MAC frames according to the total length of the MAC frames and a preset audio sampling efficiency threshold value; determining the maximum length of information fields in the MAC frames according to the length of the custom fields in the MAC frames, the minimum length of the video fields and the minimum length of the audio fields; filling to-be-transmitted audio / video data to the custom fields of the MAC frames according to the minimum length of the video fields, the minimum length of the audio fields, the maximum length of the information fields and actual transmission demands; and sending the data to a receiving end. Through application of the embodiment of the method and the device, synchronous audio transmission can be realized by using existing twisted pair on the basis of transmitting high-definition videos by using the twisted pair.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an audio and video transmission method and device. Background technique [0002] HDMI (High Definition Multimedia Interface, high-definition multimedia interface) cables and DVI (Digital Visual Interface, digital video interface) cables are currently widely used audio and video transmission cables, supporting high-definition transmission, but ordinary HDMI and DVI cables have limited transmission distances. The application in the field of long-distance audio and video signal transmission is limited. [0003] Twisted pair is a common cable in Ethernet signal transmission, especially in buildings and parks. It is widely used because of its low cost and simple construction. In recent years, twisted pair is quite common for audio and video transmission. [0004] Since the application of twisted pair is mainly data communication, the use of twisted pair to transmit audio and v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/06H04N7/08H04N7/10
CPCH04N7/063H04N7/08H04N7/10
Inventor 羊海龙赵晓云孙一飞
Owner ZHEJIANG UNIVIEW TECH CO LTD
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