HDMI Sink Device Gesture Data Transmission via HEC Channel
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Solution Overview
Problem
Current HDMI technologies lack efficient methods for transmitting and receiving motion information and data between devices, particularly between a sink device with a capture device and a source device, without requiring separate decoder chips or software, and do not effectively handle gesture information processing.
Innovation Solution
A method and apparatus using HDMI to transmit and receive data by requesting and receiving EDID capability information, gesture information, and activating the HEC channel for metadata or raw data transmission through HDMI CEC or HEC channels, enabling bilateral communication of motion data between devices with or without capture devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HDMI transmits video/audio without compression, then latency is reduced and quality is improved, but the system cannot efficiently handle additional motion information and gesture data
Solution Approach 1:
The patent segments data transmission by separating video/audio data from motion/gesture information. Video/audio data is transmitted through traditional HDMI channels while motion information is transmitted separately through HEC or CEC channels, allowing both uncompressed high-quality media and motion data to coexist without interfering with each other
Solution Approach 2:
The HDMI interface is extended to support multiple functions: traditional video/audio transmission, motion information transfer via HEC, and control signaling via CEC. This multi-functional approach allows the same physical interface to handle diverse data types without requiring separate connection systems
2Adaptability or versatility
If separate decoder chips or software are required for motion information processing, then processing capability is improved, but device complexity and cost increase
Solution Approach 1:
The sink device is equipped with a capture device that can directly capture and process motion information from the video signal. This self-service capability eliminates the need for external decoder chips or software, as the motion information is extracted and processed within the sink device itself
Solution Approach 2:
The HEC channel acts as an intermediary that efficiently carries motion information and metadata between devices. By using this dedicated communication channel, the system avoids complex processing requirements while maintaining high adaptability for motion data transmission
3Adaptability or versatility
If gesture information is transmitted through raw video data, then processing flexibility is improved, but data transmission volume and bandwidth requirements increase
Solution Approach 1:
Motion information and gesture data are extracted from raw video data and transmitted separately through the HEC channel. This extraction process allows the system to handle gesture information with reduced data volume, as only the essential motion parameters need to be transmitted rather than the entire video stream
Solution Approach 2:
The system changes the parameter representation of motion data by transmitting processed motion information (such as gesture coordinates and timing) rather than raw pixel data. This parameter transformation significantly reduces the quantity of data that needs to be transmitted while maintaining processing flexibility
Data Source
AI summary
The present invention is related to a method and an apparatus for transmitting and receiving data by using HDMI (High Definition Media Interface). A method and an apparatus according to the present invention comprises requesting reading EDID (Extended Display Identification Data) from a sink device in case the sink device is connected; receiving from the sink device EDID including capability information of the sink device, wherein the capability information indicates whether the sink device is capable of processing gesture information; requesting gesture information indicating a predetermined gesture which may be recognized or extracted from the sink device on the basis of the EDID; and receiving the gesture information from the sink device.