Adaptive YC Separation Circuit for Sampling Frequency Deviation
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Solution Overview
Problem
Conventional YC separation methods fail to effectively determine deviations in sampling frequency, leading to poor image quality when the sampling frequency is deviated, and are unable to select the appropriate YC separation mode accordingly.
Innovation Solution
A method and apparatus that generate a ratio value from subcarrier and synchronizing signal frequencies to determine if the sampling frequency is deviated, and adjust the YC separation mode by enabling or disabling inter-frame separation based on a control signal, using a YC separator with clock generators, a detecting module, and a YC separation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional adaptive YC separation methods are used, then image processing can be performed, but the methods fail to effectively determine sampling frequency deviations leading to poor image quality
Solution Approach 1:
The patent implements a feedback mechanism by detecting the sampling frequency of the input signal and using this information to control the YC separation process. The detecting module continuously monitors sampling frequency deviations and adjusts the separation mode accordingly, creating a closed-loop system that adapts to signal conditions and maintains image quality despite frequency variations.
Solution Approach 2:
The patent applies dynamics by making the YC separation method adaptable and changeable based on detected sampling frequency conditions. The system dynamically switches between different separation approaches (3-D inter-frame separation when frequency is accurate, and alternative methods when deviations are detected), allowing the processing method to optimize performance for each specific signal condition.
2Productivity
If 3-D inter-frame YC separation is performed without sampling frequency verification, then processing efficiency is maintained, but sampling point shifts occur causing poor image quality
Solution Approach 1:
The patent applies preliminary action by detecting and verifying the sampling frequency before performing the main YC separation operation. The detecting module checks the sampling frequency in advance, and only when the frequency is confirmed to be accurate does the system proceed with 3-D inter-frame separation, preventing sampling point shifts before they occur.
Solution Approach 2:
The patent introduces an intermediary detecting module that acts as a mediator between the input signal and the YC separation circuit. This intermediary component analyzes the sampling frequency and controls whether the 3-D inter-frame separation should be executed, serving as a gatekeeper that ensures only appropriately conditioned signals undergo the high-efficiency separation process.
3Reliability
If sampling frequency deviation detection is added to conventional YC separation, then image quality improves, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a detection mechanism that serves multiple purposes: it identifies sampling frequency deviations, determines appropriate separation modes, and controls the overall processing flow. The detecting module and control logic are integrated into the existing YC separation architecture, allowing a single addition to provide multiple functional benefits without proportionally increasing complexity.
Data Source
AI summary
A method for adaptive selection of YC separation is provided. While a video decoder is re-sampling, a frequency of a re-sampling signal and a pixel rate of an output signal have a fixed relation, which is used to determine if a sampling frequency of the signal is deviated. And, accordingly, an appropriate Y/C separation is selected and then performed to obtain a better image quality.