Repeater Apparatus EDID Filtering for HDMI Signal Compatibility
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Solution Overview
Problem
Repeater apparatuses struggle to process all formats that can be handled by connected sink apparatuses due to device constraints, leading to incomplete signal transmission when EDID information is not modified to reflect the capabilities of both the repeater and sink apparatuses.
Innovation Solution
A repeater apparatus with a control part that decodes and re-encodes HDMI signals, analyzing and editing EDID information to set a new format that overlaps with the capabilities of both the sink and repeater apparatuses, ensuring only processable formats are transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the repeater apparatus transmits all formats that the sink apparatus can process, then the sink apparatus can receive complete format information, but the repeater apparatus cannot process formats beyond its device capabilities
Solution Approach 1:
The repeater apparatus extracts only the subset of EDID format information that corresponds to formats it can actually process, rather than transmitting all formats supported by the sink apparatus. This selective extraction ensures that the source apparatus receives accurate capability information without including unprocessable formats.
Solution Approach 2:
The repeater apparatus modifies the EDID parameter set by replacing the complete sink apparatus format list with a filtered list containing only compatible formats. This parameter transformation allows the system to adapt the format information to match the repeater's processing capabilities while maintaining compatibility with the source apparatus.
2Loss of information
If the repeater apparatus uses the sink apparatus's EDID information directly, then format information is complete, but the source apparatus may transmit formats that the repeater cannot process
Solution Approach 1:
The repeater apparatus acts as an intermediary between the sink apparatus and source apparatus by modifying the EDID information it receives from the sink. It mediates the format information by filtering and transforming it into a form that accurately represents its own processing capabilities, ensuring compatibility throughout the signal chain.
Solution Approach 2:
The repeater apparatus performs preliminary filtering of the EDID format information before it reaches the source apparatus. By pre-processing the EDID data to remove incompatible formats, it prevents the source apparatus from attempting to transmit formats that would fail at the repeater stage.
3Ease of operation
If the repeater apparatus filters EDID information to match its capabilities, then format compatibility is ensured, but the source apparatus receives incomplete format information
Solution Approach 1:
The repeater apparatus extracts and transmits only the relevant subset of EDID format information that the source apparatus needs to know about the repeater's capabilities. This selective transmission provides complete and accurate information about processable formats without including irrelevant unprocessable formats.
Data Source
AI summary
In a home theater system having a source apparatus, a repeater apparatus and a sink apparatus connected in the recited order, when connected to a sink apparatus, whatever type it is, the repeater apparatus provides the source apparatus with video and audio signal format information that allows correct transmission. A control part 210 of the repeater apparatus 200 reads EDID information from memory 321 of the connected sink apparatus 300, and analyzes video and audio signal formats that can be processed by the sink apparatus 300, and when any format that cannot be handled by the repeater apparatus 200 itself is included, the repeater apparatus deletes information concerning that format to reconstruct the EDID information, and stores the reconstructed information into memory 221 in order to cause the source apparatus 100 to reference the stored information as EDID information of the repeater apparatus itself.