Joint Residual Audio Decoding for Low-Bitrate 3D Multichannel Sound
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Solution Overview
Problem
Existing audio encoding and decoding technologies struggle to efficiently handle three-dimensional audio scenes, particularly in encoding and decoding of multi-channel audio signals, with a desire for improved coding efficiency and quality.
Innovation Solution
An audio decoder and encoder system that utilizes residual-signal-assisted multi-channel decoding to derive multiple audio channel signals from a jointly encoded representation, exploiting similarities and dependencies between residual signals to enhance decoding quality and reduce bit rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional multi-channel audio encoding is used, then audio quality can be maintained, but bit rate increases and coding efficiency decreases
Solution Approach 1:
The patent merges the encoding of multiple residual signals by exploiting their temporal and spectral similarities. Instead of encoding each residual signal independently, the system combines them into a joint residual signal that captures common information, thereby reducing the total bit rate while maintaining audio quality.
Solution Approach 2:
The patent creates a universal residual signal that serves multiple audio channels simultaneously. This joint residual signal functions as a common correction term for multiple downmixed signals, allowing a single encoded representation to improve the quality of multiple channels without requiring separate residual encodings for each channel.
2Measurement precision
If traditional multi-channel audio encoding is used, then audio quality can be maintained, but coding efficiency decreases
Solution Approach 1:
The patent merges the encoding operations for multiple residual signals into a single unified encoding process. By combining the temporal and spectral information from multiple channels into one joint residual signal, the system reduces computational complexity and improves coding efficiency while preserving audio quality.
3Reliability
If residual signals are encoded separately for each channel, then channel independence is maintained, but bit rate increases
Solution Approach 1:
The patent merges separate residual signal encodings into a single joint encoding process that exploits correlations between channels. By identifying and encoding only the unique information in each residual signal while sharing common information, the system maintains effective channel independence while significantly reducing the total bit rate required.
Data Source
AI summary
An audio decoder for providing at least four audio channel signals on the basis of an encoded representation is configured to provide a first residual signal and a second residual signal on the basis of a jointly encoded representation of the first residual signal and of the second residual signal using a multi-channel decoding. The audio decoder is configured to provide a first audio channel signal and a second audio channel signal on the basis of a first downmix signal and the first residual signal using a residual-signal-assisted multi-channel decoding. The audio decoder is configured to provide a third audio channel signal and a fourth audio channel signal on the basis of a second downmix signal and the second residual signal using a residual-signal-assisted multi-channel decoding. An audio encoder is based on corresponding considerations.