HDMI Latency Information Exchange for Multimedia Synchronization
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Solution Overview
Problem
Current HDMI technologies lack a method for accurately transmitting and receiving latency information between sink and receiver devices, which hinders synchronization of multimedia data, particularly video and audio data.
Innovation Solution
A method and apparatus for transmitting and receiving data using HDMI, where latency information is requested, acquired, and responded to between devices, allowing for synchronization of multimedia data by processing latency information through HDMI, including parameters for audio data application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If latency information is not transmitted between devices, then the HDMI system maintains simple data transmission, but multimedia data synchronization cannot be achieved
Solution Approach 1:
The patent segments the latency compensation function into separate modules: a latency information transmission module that exchanges delay data between devices, and a latency compensation module that processes audio based on received latency information. This segmentation allows synchronization without requiring complete protocol redesign.
Solution Approach 2:
The patent introduces latency information as an intermediary element that mediates between the transmitter and receiver. This latency data acts as a communication bridge that enables synchronization without requiring complex direct coordination between devices, simplifying the overall system while achieving reliable synchronization.
2Measurement precision
If latency information transmission is implemented, then multimedia data synchronization can be achieved, but the data transmission protocol becomes more complex
Solution Approach 1:
Each device performs self-measurement of its own processing latency and automatically transmits this information to connected devices. The system uses self-service latency measurement rather than requiring external calibration or complex coordinated measurement protocols, achieving precise latency measurement with minimal protocol complexity.
3Reliability
If latency compensation is not applied, then the audio processing remains simple, but audio-video synchronization cannot be achieved
Solution Approach 1:
The patent implements preliminary latency compensation by calculating the required delay adjustment before audio output based on received latency information. This preliminary action allows the system to pre-adjust audio timing to compensate for processing delays in video equipment, achieving synchronization without requiring complex real-time adjustment mechanisms.
Data Source
AI summary
The present invention relates to a method and an apparatus for transmitting and receiving data by using high definition media interface (HDMI). According to the present invention, provided are a method including: receiving a request message for requesting first latency information indicating latency for outputting the data from a receiver, the request message including second latency information indicating the latency of the receiver; acquiring the first latency information based on at least one of the second latency information and third latency information indicating the latency of the sink device; and transmitting a response message including the first latency information as a response to the request message to the receiver, and an apparatus.