Video Resampling Buffer Regulation for Synchronization
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Solution Overview
Problem
Existing methods for synchronizing and re-formatting video signals for display devices, such as phase-locked loops, are inflexible and require large memory buffers, making them unsuitable for modern flat-panel displays and computer environments, especially when handling variable video streams.
Innovation Solution
An apparatus that automatically selects output clocks and frame layouts based on the state of a decoupling memory buffer, using a regulation mechanism to actively manage buffer overflow and underflow, allowing for minimal memory buffering and cost-effective implementation in VLSI circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phase-locked loop is used to maintain vertical synchronization phase offset, then synchronization accuracy is improved, but device complexity and memory buffer requirements increase
Solution Approach 1:
The patent extracts the synchronization control function from the complex phase-locked loop architecture and implements it through simple buffer threshold monitoring. The regulation mechanism operates independently by only monitoring buffer fullness thresholds, eliminating the need for complex phase detection and frequency locking circuitry while maintaining accurate synchronization.
Solution Approach 2:
The buffer management system performs self-regulation through automatic threshold-based control. When the buffer reaches predefined fullness thresholds, the regulation mechanism automatically adjusts timing parameters without external intervention or complex feedback loops, achieving synchronization through the buffer's own state monitoring.
2Measurement precision
If a phase-locked loop is used to regulate output clock, then synchronization accuracy is improved, but memory buffer size increases
Solution Approach 1:
Instead of using a large buffer to accommodate all possible timing variations, the patent applies partial buffering by using a small buffer combined with proactive regulation. The regulation mechanism prevents buffer overflow and underflow by adjusting timing before the buffer reaches critical levels, eliminating the need for excessive buffer capacity.
Solution Approach 2:
The system implements feedback through threshold-based monitoring of buffer fullness. When the buffer approaches predefined thresholds, the regulation mechanism adjusts output timing to prevent overflow or underflow. This feedback loop operates on buffer state rather than requiring large buffers to accommodate timing variations.
3Ease of manufacture
If a fixed memory buffer threshold trigger is used for output, then implementation simplicity is improved, but adaptability to different video streams deteriorates
Solution Approach 1:
The patent transforms the fixed threshold approach into a dynamic regulation system that adapts to different video streams. The regulation mechanism monitors buffer fullness and automatically adjusts timing parameters in real-time, allowing the system to handle variable frame rates, different video formats, and changing stream characteristics without manual reconfiguration.
Data Source
AI summary
An apparatus configured to match an input frame rate of a video stream with an output frame rate of an output stream, the apparatus comprising, at least one memory buffer, an output frame generator, and a threshold measurement unit, the threshold measurement unit configured to generate a control feedback, wherein the box is configured to analyze the control feedback to monitor a state of the at least one memory buffer, the threshold measurement unit further configured analyze the control feedback to regulate between two or more different settings, wherein the two or more different settings include slowing down or speeding up the output frame, wherein the two or more different settings further include slowing down or speeding up of the line rate of the output stream.