HDMI Signal Transmission Over Type-C Cables
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Solution Overview
Problem
The existing multimedia systems require separate cables for HDMI and USB connections, leading to clutter and inefficiency, as HDMI signals cannot be effectively transmitted over USB Type-C cables without specialized design for Bi-phase Mark Coding signals.
Innovation Solution
A multimedia system that uses a Type-C connector and cable to transmit HDMI signals by repurposing SuperSpeed differential signal lines as TMDS data and clock channels, and utilizing configuration channels for connection polarity detection and power handshaking, eliminating the need for specialized input/output devices for BMC signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HDMI signals are transmitted over Type-C cables using Bi-phase Mark Coding signals, then transmission capability is achieved, but specialized input/output devices are required increasing device complexity
Solution Approach 1:
The patent applies universality by making the Type-C connector and cable capable of carrying both USB signals and HDMI signals through the same physical interface. The SuperSpeed differential signal lines are configured to serve dual purposes: standard USB communication and HDMI TMDS data transmission, eliminating the need for separate specialized devices for each signal type.
Solution Approach 2:
The patent changes the signal encoding parameter by using Bi-phase Mark Coding (BMC) instead of standard USB differential signaling. This parameter change allows the same physical channel (SuperSpeed differential signal lines) to carry HDMI signals while maintaining compatibility with the Type-C connector architecture, avoiding the need for specialized input/output devices.
2Reliability
If separate cables are used for HDMI and USB connections, then signal transmission reliability is maintained, but cable clutter increases and installation becomes complicated
Solution Approach 1:
The patent merges the HDMI and USB connection functions into a single Type-C cable assembly. The same cable that provides USB power and data transmission also carries HDMI audio and video signals, eliminating the need for separate HDMI cables and reducing installation complexity while maintaining signal transmission reliability through proper signal routing and shielding.
3Ease of operation
If Type-C connector is used for HDMI transmission, then cable clutter is reduced, but connection polarity detection becomes critical for proper signal routing
Solution Approach 1:
The patent uses configuration channels as intermediaries to detect connection polarity and establish proper signal routing. These dedicated signal lines communicate connection status and polarity information between the Type-C connector and the receiving device, enabling the system to automatically adjust signal paths based on detected polarity without requiring complex manual configuration.
Data Source
AI summary
A multimedia communication apparatus, suitable for a first multimedia apparatus, is adapted to transmit or receive multimedia data and is electrically connectable to a standard connector. The standard connector may be non-reversibly or reversibly connected to a plug of a standard cable, and includes a plurality of the pins. The pins include multiple differential signal pins serving as multiple multimedia channels, a power pin serving as a power line, a first polarity pin, a first data pin and a ground pin. The multimedia communication apparatus includes a control logic and a multimedia signal processor. The multimedia signal processor transmits or receives multimedia data to/from a second multimedia apparatus through the multimedia channels, and further power handshakes or exchanges information with the second multimedia apparatus. The information is for controlling a multiplexer to switch the multimedia channels.