Video Scaler Open-Loop Frequency Offset Mechanism
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Solution Overview
Problem
Conventional video systems with closed-loop mechanisms for frame synchronization require complex tracking and circuitry, increasing complexity and making it difficult to manage variations in clock control signals effectively.
Innovation Solution
A video system utilizing an open-loop mechanism where a tracking unit generates synchronization and frequency offset signals, allowing the scaler to produce a frequency control signal without tracking frequency variations, thereby reducing circuit complexity and improving synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed-loop tracking mechanism is used to track clock control signals, then frame synchronization accuracy is improved, but circuit complexity increases
Solution Approach 1:
The patent extracts the frequency offset signal generation function from the closed-loop tracking mechanism. Instead of using a complex closed-loop circuit to track frequency variations, the invention separates the frequency offset signal generation (performed by the decoder's tracking unit) from the scaler's clock generation function. This allows the scaler to operate with a simpler open-loop mechanism while still achieving accurate frame synchronization through the frequency offset signal provided by the decoder.
2Reliability
If a closed-loop tracking mechanism is used to track frequency variations, then synchronization reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces the frequency offset signal as an intermediary element that carries synchronization information from the decoder to the scaler. Instead of the scaler directly tracking frequency variations through a closed-loop mechanism, the frequency offset signal acts as a mediator that provides the necessary synchronization data, allowing the scaler to generate accurate output clock signals without complex tracking circuitry.
3Reliability
If complex tracking algorithms are used to track clock control signals, then frame synchronization is improved, but processing complexity increases
Solution Approach 1:
The patent segments the synchronization function between the decoder and the scaler. The decoder's tracking unit performs the complex tracking algorithm to generate the frequency offset signal, while the scaler's job is simplified to generating output clock signals based on this pre-computed frequency offset signal. This segmentation allows complex processing to occur at the decoder where it is most needed, while keeping the scaler's processing relatively simple.
Data Source
AI summary
A video system includes a decoder and a scaler. The decoder tracks a video signal, generates a synchronization signal and a frequency offset signal, decodes the video signal, and outputs a decoded signal in accordance with the synchronization signal. The scaler generates a frequency control signal in accordance with the frequency drift signal, generates an output clock signal in accordance with the frequency control signal, generates a scaled signal in accordance with the decoded signal, and outputs a display signal in accordance with the scaled signal and the output clock signal.