Multi-Channel Audio Coding with Optional Parameter Sets
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Solution Overview
Problem
Existing multi-channel audio decoding technologies face challenges in format compatibility between different decoders and versions of parametric side information, leading to issues with scalability and backward compatibility, particularly in resource-limited devices and when dealing with various generations of encoders and decoders.
Innovation Solution
A system that writes coded multi-channel signals with two different parameter sets into a data stream, where the first set is mandatory for reconstruction and the second set is optional, allowing decoders to skip unnecessary parameters based on compatibility and resource availability, ensuring efficient decoding with either high or reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different parameter sets are transmitted for reconstructing output channels, then the flexibility and quality of multi-channel reconstruction is improved, but the amount of data to be transmitted and processed increases
Solution Approach 1:
The parametric data is segmented into multiple different parameter sets, each capable of independently reconstructing output channels. The encoder transmits multiple parameter sets (e.g., first parameter set, second parameter set) corresponding to different encoding configurations, allowing the decoder to select and use only the necessary sets for the desired reconstruction quality and channel configuration.
Solution Approach 2:
The system dynamically adapts the transmission and processing of parametric data based on the specific reconstruction needs. The decoder can selectively process only the parameter sets required for the current output channel configuration, adjusting the amount of data processed according to the actual playback requirements rather than always processing all available parameter sets.
2Adaptability or versatility
If new parameter sets are added to support newer decoder versions, then the functionality and quality of new decoders is improved, but the compatibility with older decoders deteriorates
Solution Approach 1:
The encoding system is designed with universal compatibility by transmitting multiple parameter sets that can serve different decoder versions and configurations. The first parameter set is configured to be compatible with older decoders, while additional parameter sets support newer decoder versions with enhanced functionality, allowing a single encoded signal to work across multiple decoder generations.
Solution Approach 2:
The encoder preliminarily prepares multiple parameter sets in advance, including both legacy-compatible and advanced parameter sets. This preliminary preparation ensures that when the signal is decoded, older decoders can use the compatible parameter sets while newer decoders can utilize the advanced parameter sets for improved reconstruction quality.
3Manufacturing precision
If all parameter sets are processed by the decoder, then the reconstruction quality is improved, but the computational complexity and resource consumption increase
Solution Approach 1:
The decoder performs partial processing by selectively using only the necessary parameter sets for the current reconstruction task. Rather than always processing all available parameter sets, the decoder intelligently selects and processes only the subset needed for the desired output channel configuration and quality level, reducing unnecessary computational overhead.
Solution Approach 2:
Different parameter sets are used for different output channel configurations and quality requirements. The system applies appropriate parameter sets locally based on the specific reconstruction needs - using simpler parameter sets for basic configurations and more advanced parameter sets only when higher reconstruction quality is required for specific channels or configurations.
4Adaptability or versatility
If multiple parameter sets are transmitted for different channel configurations, then the adaptability to various playback systems is improved, but the data transmission bandwidth requirement increases
Solution Approach 1:
The multiple parameter sets are designed with universal applicability where each set can independently support different channel configurations and playback system types. This universal design allows the same encoded signal with multiple parameter sets to adapt to various playback systems (stereo, surround, immersive audio) without requiring separate encodings for each configuration.
Solution Approach 2:
The transmission system dynamically adapts which parameter sets are transmitted based on the capabilities of the receiving decoder and the intended playback configuration. The encoder or transmission system can selectively include only the necessary parameter sets for the target application, adjusting the total data volume transmitted according to the specific playback system requirements.
Data Source
AI summary
In a multi-channel encoder generating several different parameter sets for reconstructing a multi-channel output signal using at least one transmission channel, the data stream is written such that the two parameter sets are decodable independently of each other. Thus, a multi-channel decoder is enabled to skip a parameter set which is marked as optional and/or has a higher version number when reading the data stream and still to perform a valid multi-channel reconstruction using a data set marked as mandatory or a data set having a sufficiently low version number. This achieves a flexible encoder/decoder concept suitable for future updates characterized by backward compatibility and reliability.