Multistream Audio Packetization for HDMI Transreceiving Systems
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Solution Overview
Problem
Current wired interface environments for data transmission, such as HDMI and MHL, lack efficient standards for transmitting multichannel audio signals, particularly in multiview environments where multiple contents with different audio streams are displayed simultaneously, requiring innovative packetization and metadata handling to manage and transmit audio data effectively.
Innovation Solution
A data transreceiving system and method that generates and transmits packets with multiple sub-packets, each containing audio data for multiple contents, using identification fields, stream presence bits, and effective data indicators, and includes extended display identification data (EDID) blocks for 3D audio characteristics and metadata packets for channel allocation, enabling efficient transmission of multistream audio signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple audio streams for different contents are transmitted simultaneously, then the functionality for multiview environments is improved, but the complexity of packetization and data management increases
Solution Approach 1:
The audio data is divided into multiple sub-packets, with each sub-packet containing audio data for a specific content stream. Each sub-packet includes an identification field that indicates which content the audio data belongs to. This segmentation allows the transmitting apparatus to handle multiple audio streams separately while maintaining organized structure, and enables the receiving apparatus to parse and process each stream independently based on the identification fields.
2Measurement precision
If identification fields and stream metadata are added to each packet, then the accuracy of audio data identification is improved, but the data overhead and transmission bandwidth consumption increase
Solution Approach 1:
The identification field and stream metadata (such as stream present bit and stream flat bit) are added selectively to only those packets that contain audio data for multiple contents. The stream present bit indicates whether a sub-packet includes audio data, and the stream flat bit indicates whether the audio data is effective. This partial addition of metadata reduces overall data overhead compared to adding comprehensive information to every packet, while still providing sufficient identification accuracy for multistream audio data.
Data Source
AI summary
A data transmitting apparatus is provided. The data transmitting apparatus includes a packet generator configured to generate a packet including a plurality of sub packets and a transmitter configured to transmit the generated packet to a data receiving apparatus. Each of the plurality of sub packets includes audio data corresponding to content among a plurality of contents.