HDMI Repeater VSDB Compatibility Check
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Solution Overview
Problem
HDMI repeaters may transmit Vendor Specific Data Blocks (VSDBs) to HDMI sources without understanding their contents, potentially causing damage to repeaters not compatible with functional extensions such as changes in PHY specifications or new applications.
Innovation Solution
An electronic device with a signal receiving unit, a storage unit for data blocks containing capability information about extended functions, and an information transmitting unit, where a layer field indicating a connection layer is provided in the data block, allowing the device to determine compatibility and avoid damaging non-compatible devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the HDMI repeater transmits the VSDB to the HDMI source without comprehending the contents, then the transmission can be performed simply, but the HDMI source may output a contents signal that damages the repeater
Solution Approach 1:
The repeater performs preliminary action by comprehending the VSDB contents before transmission and checking compatibility with extended functions in advance. This prevents harmful signals from reaching incompatible devices, resolving the contradiction between simple transmission and device protection
Solution Approach 2:
The repeater acts as an intermediary that intercepts and processes the VSDB between the sink and source devices. By comprehending the VSDB contents and determining compatibility, it mediates the transmission to prevent damage while maintaining overall system functionality
2Reliability
If the repeater comprehends and processes the VSDB contents, then device compatibility can be ensured, but the processing complexity increases
Solution Approach 1:
The repeater applies local quality by comprehending and processing only the VSDB contents related to extended function compatibility, while leaving other transmission functions unchanged. This targeted approach ensures compatibility assurance without unnecessarily increasing overall system complexity
3Adaptability or versatility
If the source device outputs signals according to VSDB configuration, then functional extension is achieved, but incompatible repeaters are damaged
Solution Approach 1:
The repeater performs preliminary compatibility checking by comprehending the VSDB before the source device outputs extended function signals. This advance determination allows the system to maintain functional extension capability while preventing damage to incompatible repeaters through early detection and signal adjustment
Data Source
AI summary
Damaging a device that is not compatible with a functional extension is to be avoided. A signal is transmitted to an external device through a transmission channel. A data block containing capability information indicating existence/non-existence of compatibility with an extended function is received from the external device through the transmission channel. A layer field that indicates the connection layer is provided in this data block. A check is made to determine whether all the devices existing in the path are compatible with the extended function based on the value of the layer field provided in the data block, and the contents of the transmission signal are then determined.