Analog Video Equalization Circuit for Long Coaxial Transmission
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Solution Overview
Problem
Existing solutions for analog video signal equalization, particularly for high-definition signals, are inadequate as they either rely on fixed gain compensation, which is insufficient for wide bandwidth signals, or use costly integrated chips not adaptable to varying frequency ranges, failing to effectively address transmission distortion over long coaxial cables.
Innovation Solution
A video signal processing device with a signal drive circuit, equalization unit, and analog switching unit that enhances the signal by suppressing common-mode interference and dynamically equalizes attenuation based on calculated attenuation differences between high and low-frequency components, using multiple equalization sub-units controlled by specific control signals to address varying attenuation intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fixed gain compensation is used to amplify the video signal, then the signal amplitude attenuation is corrected, but the high-frequency component attenuation and group delay distortion remain unaddressed
Solution Approach 1:
The equalization circuit is divided into multiple frequency bands with separate gain control. Each frequency band has its own attenuation compensation mechanism, allowing independent optimization of low-frequency and high-frequency components. This segmentation enables precise control over different frequency ranges without affecting others, resolving the contradiction between amplitude correction and distortion prevention.
Solution Approach 2:
Different gain values are applied to different frequency components based on their specific attenuation characteristics. The circuit implements frequency-dependent equalization where each frequency band receives customized compensation tailored to its transmission losses, rather than applying a uniform gain across all frequencies. This local quality approach corrects amplitude while maintaining signal fidelity.
2Reliability
If integrated chip equalization is used, then signal quality is improved, but the cost increases significantly
Solution Approach 1:
The patent replaces expensive integrated chip equalizers with a cost-effective discrete component implementation. The equalization function is achieved using readily available operational amplifiers, resistors, capacitors, and switches arranged in a modular circuit configuration. This approach maintains signal quality while dramatically reducing component costs and making the solution accessible for budget-sensitive applications.
Solution Approach 2:
The patent replicates the functionality of expensive integrated equalization chips using discrete electronic components. By copying the equalization function through a circuit implemented with operational amplifiers and passive components, the design achieves equivalent performance to integrated solutions without the high cost associated with proprietary chips.
3Adaptability or versatility
If standard equalization circuits are used, then they work for standard-definition signals, but they cannot handle high-definition video signals with wider frequency ranges
Solution Approach 1:
The equalization circuit incorporates dynamic gain control that can be adjusted based on the input signal characteristics. The circuit includes switches and control logic that enable different equalization profiles to be activated depending on whether standard-definition or high-definition signals are detected. This dynamic adaptability allows the same circuit to effectively handle both SD and HD video signals across different frequency ranges.
Solution Approach 2:
The patent designs a universal equalization circuit that can serve multiple function for both standard-definition and high-definition video signals. By incorporating frequency-dependent gain stages and programmable control, the circuit achieves multi-functionality, adapting its equalization characteristics to match the requirements of different video formats and frequency ranges within a single unified design.
Data Source
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AI summary
Disclosed are a video signal attenuation equalization circuit, a video signal processing apparatus, and a control device and method, which are used for solving the problem that the transmission of an analogue video signal is distorted after the analogue video signal is transmitted by a coaxial cable, so as to guarantee low signal distortion after the video signal is transmitted at a long distance. The video signal attenuation equalization circuit provided in the embodiments of the present invention comprises: a signal driving circuit, an equalization unit and an analogue switch unit, wherein the signal driving circuit is connected to the equalization unit and the analogue switch unit, and is used for receiving and strengthening an initial video signal, and sending the obtained strengthened initial video signal to the equalization unit and the analogue switch unit; the equalization unit is used for performing attenuation equalization on the strengthened initial video signal according to the triggering of a control signal, and after the attenuation equalization sending the video signal to the analogue switch unit; and the analogue switch unit is used for outputting the strengthened initial video signal or the video signal sent by the equalization unit after the attenuation equalization according to the control of the control signal.