Dynamic Voltage Level Control Circuit for Video Signal Jitter Reduction
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Solution Overview
Problem
Conventional video signal decoders experience distortion due to noise interference, leading to asynchronous retrieval of horizontal synchronization signals, resulting in jitter and video quality issues.
Innovation Solution
A voltage level control circuit comprising a slicing circuit, detection circuit, oscillating circuit, and adjusting circuit that sequentially applies multiple slicing voltage levels to generate clock signals, detects phase differences, and adjusts the target slicing voltage level to minimize jitter, using a low-pass filter and numerically controlled oscillator to refine the video signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional video signal decoder uses a fixed slicing voltage level to retrieve the horizontal synchronization signal, then the circuit structure is simple, but the retrieved signal becomes asynchronous with the original signal due to noise interference, causing jitter and distortion
Solution Approach 1:
The patent implements a dynamic slicing voltage level adjustment mechanism where the slicing voltage is no longer fixed but is continuously optimized based on feedback from phase difference detection. The system automatically adjusts the slicing voltage level to track and compensate for signal variations caused by noise interference, thereby maintaining synchronization accuracy without requiring complex external calibration equipment.
Solution Approach 2:
The patent introduces a feedback loop consisting of a detection circuit that measures phase differences between the retrieved horizontal synchronization signal and a reference signal, and an adjusting circuit that uses this feedback information to dynamically optimize the slicing voltage level. This closed-loop control system continuously eliminates synchronization errors caused by noise, significantly improving signal retrieval reliability.
2Reliability
If the slicing voltage level is adjusted to compensate for noise interference, then the signal synchronization accuracy is improved, but the circuit structure becomes more complex with additional detection and adjustment components
Solution Approach 1:
The patent integrates the detection circuit and adjusting circuit directly into the existing video signal decoding architecture, merging their functions with the slicing operation. Rather than adding completely separate external systems, the invention combines multiple functions (slicing, detection, and adjustment) into a unified circuit structure that shares common components and signal paths, thereby reducing overall system complexity while achieving reliable synchronization.
Solution Approach 2:
The patent implements a self-adjusting mechanism where the system automatically detects and corrects its own synchronization errors without requiring external intervention or calibration equipment. The detection circuit monitors phase differences and the adjusting circuit autonomously modifies the slicing voltage level to eliminate errors, enabling the system to self-optimize its performance and maintain accuracy under varying noise conditions.
3Manufacturing precision
If multiple slicing voltage levels are sequentially applied to find the optimal level, then the jitter is reduced and video quality is improved, but the processing time increases
Solution Approach 1:
The patent performs preliminary optimization by sequentially testing multiple slicing voltage levels during an initial calibration phase to establish an optimal starting point. Once the optimal voltage level is identified through this preliminary action, the system locks onto this setting and maintains it during normal operation, avoiding the need for continuous sequential searching and thereby reducing processing time while preserving decoding accuracy.
Solution Approach 2:
The patent implements periodic optimization where the sequential testing of multiple slicing voltage levels is performed at specific intervals or under specific conditions (such as when signal quality degrades or at the beginning of video playback). Between these periodic optimization cycles, the system operates with the previously determined optimal voltage level, thus balancing the need for high decoding accuracy with efficient real-time processing.
Data Source
AI summary
A voltage level control circuit controls a target slicing voltage level to slice a video signal by a target circuit. The voltage level control circuit includes a slicing circuit for sequentially slicing the video signal by a plurality of slicing voltage levels to correspondingly generate a plurality of first clock signals; a detection circuit for respectively detecting a plurality of phase differences between the first clock signals and a plurality of corresponding second clock signals to generate a plurality of detection signals; an oscillating circuit for generating the second clock signals according to the detection signals, respectively; and an adjusting circuit for determining whether to adjust the target slicing voltage level according to the detection signals corresponding to the slicing voltage levels.