HDMI Transmission Apparatus Register Inquiry Mechanism
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Solution Overview
Problem
In high-definition multimedia interface (HDMI) systems, accessing a cable's register to determine its specifications can lead to malfunctions in sink apparatuses when the address is undefined, as access information is transmitted to the sink apparatus even if the cable lacks a register.
Innovation Solution
A transmission apparatus and cable design that includes an inquiry unit to check for the presence of a register, an information reception unit to receive confirmation of the register's presence, and an access unit to acquire or write data only when the register is present, preventing unnecessary access information transmission to the sink apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmission apparatus accesses the cable's register to determine cable specifications, then the cable specification identification is improved, but malfunction occurs in the sink apparatus when the address is not defined
Solution Approach 1:
The transmission apparatus performs a preliminary inquiry to check whether the cable has a register before attempting to access it. This preliminary action prevents the transmission of access information to sink apparatuses that do not have the corresponding address defined, thereby avoiding malfunctions while still enabling cable specification identification when the register is present.
2Ease of operation
If the transmission apparatus transmits access information to the cable via the DDC line, then the register can be accessed, but the access information is also transmitted to the sink apparatus causing potential malfunction
Solution Approach 1:
The patent introduces an intermediary inquiry mechanism that acts as a mediator between the transmission apparatus and the cable/sink apparatus. The transmission apparatus first sends an inquiry signal through the DDC line to check for register presence, and only if the inquiry confirms the cable has a register does it proceed with access operations. This intermediary step prevents harmful access information from reaching sink apparatuses without defined addresses.
Data Source
AI summary
A transmission apparatus is capable of accessing a register of a cable satisfactorily. An inquiry about the presence or absence of a register in a cable connected between the transmission apparatus and a reception apparatus is performed. In response to the inquiry, information indicating the presence or absence of the register is received from the cable. When the information indicates the presence of the register, the register of the cable is accessed so that acquisition of storage data or writing in the storage data is performed.