Steganographic Audio Sub-stream Embedding for Backwards Compatible 3D Teleconferencing
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Solution Overview
Problem
Current 3D audio teleconferencing systems require higher bit rates and are not backwards compatible with legacy mono-only terminal devices, limiting adoption due to increased upgrade costs and compatibility issues.
Innovation Solution
A multi-party control unit (MCU) embeds lower-quality sub-streams representing sounds from other terminal devices into mixed audio data streams using steganography, allowing both mono and stereo playback compatibility without increasing bitrates, enabling 3D audio teleconferencing while supporting legacy devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 3D audio teleconferencing is implemented using traditional methods, then spatial audio quality is improved, but bit rate increases and compatibility with legacy mono-only devices is lost
Solution Approach 1:
The audio signal is segmented into multiple components: a high-quality mixed audio stream and embedded sub-streams containing spatial position information for each participant. This segmentation allows legacy devices to process only the mixed stream while 3D-capable devices can extract and utilize the embedded sub-streams for spatial rendering
Solution Approach 2:
The sub-streams containing spatial information are nested within the mixed audio data stream using steganographic embedding techniques. This nesting allows the spatial information to be transported within the existing audio infrastructure without requiring separate communication channels or increasing overall bit rate
2Measurement precision
If 3D audio teleconferencing is implemented using traditional methods, then spatial audio quality is improved, but device complexity and upgrade costs increase
Solution Approach 1:
The system provides backward compatibility services automatically - legacy mono-only devices simply play the mixed audio stream without needing to know about or process the embedded sub-streams. 3D-capable devices automatically detect and extract the embedded spatial information, enabling spatial audio without requiring manual configuration or complex upgrade procedures
Solution Approach 2:
The mixed audio data stream serves multiple functions simultaneously: it provides high-quality audio for all devices while also carrying embedded spatial information for 3D-capable devices. This multi-functionality eliminates the need for separate audio streams or complex device-specific processing
3Adaptability or versatility
If sub-streams are embedded into mixed audio data streams using steganography, then both mono and stereo playback compatibility is achieved without increasing bitrates, but processing complexity increases
Solution Approach 1:
The steganographic embedding processes only the essential spatial information parameters rather than the entire audio signal. This partial action approach embeds only the necessary position data in the sub-streams, reducing the computational burden of both embedding and extraction operations while maintaining compatibility
Data Source
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AI summary
A multi-party control unit (MCU) generates, based on audio data streams that represent sounds associated terminal devices, a mixed audio data stream. In addition, the MCU modifies the mixed mono audio data to steganographically embed sub-streams that include representations of the mono audio data streams. A terminal device receives the modified mixed audio data stream. When the terminal device is configured for stereo playback, the terminal device performs an inverse steganographic process to extract, from the mixed audio data stream, the sub-streams. The terminal device generates and outputs multi-channel audio data based on the extracted sub-streams and the mixed audio data stream. When the terminal device is not configured for stereo playback, the terminal device outputs sound based on the mixed audio data stream without extracting the embedded sub-streams.