HDMI Sink Signal Delay for Stable Audio-Video Output
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Solution Overview
Problem
Video and audio defects occur during signal stabilization periods in HDMI 2.1 standard connections due to distorted equalizer settings, causing inconvenience in viewing and listening experiences.
Innovation Solution
A sink device with a memory and controller that identifies the source device and delays signals based on stored delay timing values to avoid output during stabilization periods, preventing video and audio interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sink device performs equalizer setting during the stabilization period, then the equalizer value becomes distorted, but this causes video and audio defects
Solution Approach 1:
The controller stores delay timing values in advance for different source device types in a memory device. When a source device is connected, the controller retrieves the appropriate delay timing value and delays the signal output accordingly, preventing equalizer setting during the stabilization period and avoiding video/audio defects.
2Loss of energy
If the signal is output immediately during stabilization period, then power consumption is reduced, but video and audio interruption occurs
Solution Approach 1:
The system prepares delay timing values in advance for different source device types and stores them in memory. This allows the sink device to immediately apply the correct delay when a source device connects, maintaining power efficiency while ensuring continuous stable video and audio output without interruptions during stabilization.
3Loss of energy
If different stabilization periods are used for different external devices, then power efficiency is improved, but device compatibility issues arise
Solution Approach 1:
The controller identifies the type of connected source device and retrieves the corresponding delay timing value from memory, which is specific to each device type. This allows the system to optimize power efficiency for each device while maintaining compatibility across various HDMI 2.1 standard devices through device-specific parameter adjustment.
Data Source
AI summary
The sink device according to an embodiment of the present disclosure comprises a memory, an external device interface configured to receive a signal output from a source device through the HDMI (High-Definition Multimedia Interface) standard and a controller configured to obtain identification information of the source device, determine whether a delay timing value matched the identification information of the source device is stored in the memory, and delay the first signal received from the source device based on the delay timing value if the delay timing value matched the identification information of the source device is stored in the memory.