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Analog high-definition video transmission system

A transmission system and high-definition video technology, applied in the field of video transmission, can solve the problems of analog high-definition video standards without high-speed digital uplink channels, poor-quality cables, etc., and achieve the effect of improving adaptability and channel estimation accuracy

Active Publication Date: 2016-05-25
SHANGHAI FULLHAN MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide an analog high-definition video transmission system, which can solve the problem that the existing analog high-definition video standard does not have a high-speed digital uplink channel, and at the same time solve the problem of long and poor quality cables for complex field wiring environments adaptation problem

Method used

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  • Analog high-definition video transmission system
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  • Analog high-definition video transmission system

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Embodiment Construction

[0030] The technical means adopted by the present invention to achieve the intended invention purpose are further described below in conjunction with the drawings and preferred embodiments of the present invention.

[0031] figure 1 It is the architecture of a typical analog high-definition transmission system. Including a sending end 10 and a receiving end 20; wherein, the sending end 10 includes a video processing module 11, a signal modulation / mixing module 12, an adder 13, a pre-emphasis module 14, a DAC module 15 and a Line driver module 16; the video processing module 11 accepts the high-definition digital video signal input from the outside, and converts it into bright color signal 0 for raster sequential scanning, and blanking interval insertion is usually completed at this stage. The signal modulation / mixing module 12 receives the bright color signal 0 , modulates and mixes it into a composite video signal 0 . The composite video signal 0 and a synchronization / contr...

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Abstract

The invention relates to an analog high-definition video transmission system. Mainly, a digital signal is embedded into an analog high-definition system, and line / field blanks and idle time / frequency spaces, which are not used by the analog high-definition system, are utilized to carry out transmission, and thus, downward compatibility can be achieved. Meanwhile, by using a digital channel estimation technology, an amplitude-frequency and phase-frequency response of a coaxial cable / twisted-pair channel can be accurately estimated, and thus, compared with the prior art of estimating a channel response only according to measurement on amplitude-frequency responses of a small number of frequency points of the channel, channel estimation accuracy of the analog high-definition video transmission system provided by the invention is obviously improved, so that adaptability to different channels and particularly poor cables is promoted.

Description

technical field [0001] The invention belongs to the field of video transmission, and relates to a transmission system for transmitting video signals on coaxial cables, in particular to a device for transmitting high-definition analog video signals and digital signals on coaxial cables or twisted pairs . Background technique [0002] At present, analog video transmission based on coaxial cable is widely used in various CCTV monitoring system applications. Since the earliest CVBS standard can no longer meet the needs of high-definition video transmission, HD-SDI has been adopted as the standard for coaxial high-definition video transmission for a long time. However, its high data rate limits the transmission distance. In order to solve this problem, there are usually two ways: one is to compress the digital high-definition video, thereby reducing the rate to reduce its requirements on the channel, such as various types based on MJPEG, AVC or HEVC IP cameras, IP-based surveil...

Claims

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Application Information

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IPC IPC(8): H04N21/2383H04N21/426H04N21/43H04N21/438H04N21/61
CPCH04N21/2383H04N21/42676H04N21/4305H04N21/4307H04N21/4382H04N21/6118H04N21/6168
Inventor 诸悦刘翔万建军金永明汤勇丁亚男
Owner SHANGHAI FULLHAN MICROELECTRONICS
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