Video Interface Conversion Apparatus Clock Synchronization
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Solution Overview
Problem
Video interface conversion apparatuses face issues with residual synchronization signal deviations when converting between different video interfaces, such as DisplayPort and HDMI, due to asynchronous clocks, leading to video data errors over time.
Innovation Solution
A video interface conversion apparatus comprising a first video interface physical layer circuit, a video clock adjustment information generation circuit, and a video clock recovery circuit, which fetches original data and clock, generates synchronization signals, and adjusts the video clock to synchronize with the original clock, mitigating deviations by dynamically responding to the period length of the original clock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video synchronization signal is transmitted from LS_CLK unit to Video CLK unit using asynchronous clocks, then interface conversion between different video standards is enabled, but asynchronous deviation accumulates over time resulting in video data error
Solution Approach 1:
The patent introduces a video clock adjustment information generation circuit as an intermediary between the LS_CLK unit and Video CLK unit. This circuit generates adjustment information based on the original synchronization signal and video clock, then uses this information to correct the video clock, preventing asynchronous deviation accumulation while enabling interface conversion between different video standards
Solution Approach 2:
The patent implements a feedback mechanism where the video clock adjustment information generation circuit continuously monitors the synchronization signal and video clock, generates adjustment information based on their relationship, and feeds back corrections to the video clock. This closed-loop feedback prevents asynchronous deviation from accumulating over time
2Measurement precision
If video clock is adjusted dynamically to respond to original clock period length, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of video clock frequency dynamically by adjusting it according to the period length of the original clock. The video clock adjustment information generation circuit modifies the video clock parameter based on detected synchronization deviations, achieving precise synchronization without requiring complex hardware architectures
Data Source
AI summary
A video interface conversion apparatus comprises a video interface circuit, a video clock adjustment information generation circuit and a video clock recovery circuit. The video interface circuit generates at least one original synchronization signal according to a control signal, and fetches video data from a data signal according to a video synchronization signal. The video clock adjustment information generation circuit generates video clock adjustment information and the video synchronization signal according to the original video synchronization signal and a video clock. The video clock recovery circuit receives an original clock and the video clock adjustment information, and recovers the video clock by adjusting the original clock according to the video clock adjustment information.