Analog Video Signal Format Detection and Luminance Chrominance Separation
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Solution Overview
Problem
Existing video reception technologies face issues with analog video signal processing, particularly in closed-circuit systems, where limited frequency bands can lead to alternating color and luminance inclusion problems, and there is a need for efficient conversion of analog to digital signals while maintaining resolution and noise removal.
Innovation Solution
A method and apparatus for receiving and converting analog video signals to digital signals, involving a processor that determines the format of the analog signal, separates it into luminance and color difference signals using an adaptive comb filter, removes noise, and reconfigures the signal based on these components, allowing for accurate resolution adjustment and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standardized composite signal method is used in closed-circuit systems, then compatibility with existing analog TV systems is improved, but alternating color and luminance inclusion issues occur due to limited frequency band
Solution Approach 1:
The patent segments the video signal processing into separate luminance and chrominance components, processing them independently through different filtering paths. This allows the system to maintain compatibility with standard analog TV systems while avoiding the harmful effects of alternating color and luminance inclusion by treating each component separately rather than as a combined composite signal
Solution Approach 2:
The patent applies partial action by selectively processing only the necessary frequency components for each signal type. The luminance signal is filtered to remove high-frequency chrominance interference, while the chrominance signal is processed to eliminate low-frequency luminance interference, rather than processing the entire composite signal spectrum
2Reliability
If analog video signals are converted to digital signals, then signal quality and noise reduction are improved, but format determination and processing complexity increase
Solution Approach 1:
The patent performs preliminary format determination and signal separation before the main conversion process. By identifying the analog signal format (NTSC, PAL, or SECAM) and separating luminance and chrominance components in advance, the system simplifies subsequent digital conversion and processing steps, reducing overall processing complexity while maintaining high signal quality
Solution Approach 2:
The patent introduces an intermediary processing stage that acts as a bridge between analog and digital domains. This intermediary stage performs format-specific processing, signal separation, and preliminary filtering, making the transition from analog to digital smoother and less complex by handling format variations in a standardized intermediate format
Data Source
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AI summary
Provided is a method and apparatus for converting, to a digital video signal, an analog video signal capable of having a variety of resolutions. A video reception apparatus determines a format of an analog video signal by sampling the analog video signal. The video reception apparatus converts the analog video signal to a digital video signal based on the determined format. A comb filter is used to separate a color difference signal and a luminance signal from the digital video signal, and the digital video signal is reconfigured using the luminance signal and the color difference signal.