Adaptive balanced and non-balanced dual mode video receiving chip

Abstract

The invention discloses an adaptive balanced and non-balanced dual mode video receiving chip, which comprises a balanced and non-balanced video signal input unit, a balanced video signal amplifying unit, a balanced and non-balanced signal driving unit, a video synchronous separating and clamping unit, a video signal digitalization processing unit, an intelligent phase and gain compensation operating control unit, a high and low frequency phase and gain compensation unit, and a state indicating and function setting unit. The adaptive balanced and non-balanced dual mode video receiving chip hasthe advantages of adaptive balanced signal and non-balanced video signal receiving, adaptive balanced signal polarity and function of outputting a balanced and non-balanced signal. The receiving adaptation is that: the chip automatically identifies the source of a video signal, automatically analyzes and calculates the phase, the gain and the loss of an input signal, and compensates and recovers the video signal to the largest extent; and the polarity adaptation is that: the polarity of the balanced signal can transposed. The adaptive balanced and non-balanced dual mode video receiving chip is used for adaptive video receiving and relaying equipment.

Description

technical field [0001] The invention relates to a video signal receiving chip, especially to a wired video receiving device for closed-circuit television image monitoring and visual building intercom, digital video recorder twisted pair or coaxial cable video receiving channel, video repeater, etc. required integrated circuit chips. Background technique [0002] In traditional video surveillance projects, coaxial cables are used for longer distance video signal transmission. As the price of wire rods continues to rise, the cost of wire rods accounts for an increasing proportion of the entire video surveillance system. The use of twisted pair wires to realize video signal transmission over a longer distance has the advantages of convenient construction and economy, so there is a tendency to gradually replace coaxial cables. Unlike coaxial cables that transmit unbalanced signals, twisted-pair cables transmit balanced signals. Therefore, in order to realize long-distance vide...

AI Technical Summary

Problems solved by technology

[0005] 1. During the installation process of the equipment on the project site, the installation conditions and construction environment vary greatly, the manual debugging workload is relatively large, and the labor cost is relatively high;

[0006] 2. Due to the difference in the experience and quality of the debugging personnel, and the project debugging results are mainly based on the subjective judgment of the debugging personnel, the transmission equipment may not be able to be debugged in the best state

Therefore, the quality of the project depends heavily on the quality and experience of the commissioning personnel, and the consistency of the project quality is poor;

[0007] 3. When the video signal is transmitted over a long distance, both the sending end and the receiving end need to be manually adjusted, and the judgment standards of the debugging personnel are not uniform, making joint debugging very difficult;

[0008] 4. In some occasions where it is necessary to frequently switch receiving channels of different lengths, such as the video receiving end of video intercom, etc., it is impossible to manually adjust once each switching

At present, very few manufacturers use general-purpose components to design adaptive receiving equipment, which has the problems of high cost, poor reliability, and low cost performance, so it is difficult to be widely used

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