Multi-Channel Audio Encoding With Selective Reverberation Subbands
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Solution Overview
Problem
Existing multi-channel audio encoding methods require a large number of bits to encode reverberation gain parameters for each subband, leading to reduced auditory quality due to increased bit overhead and potential distortion during reverberation processing.
Innovation Solution
A method that determines a target reverberation gain parameter based on energy and coherence between channel signals and their downmixed signal, selectively encoding these parameters for only specific subbands, reducing bit overhead and improving encoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverberation gain parameters corresponding to each subband of the channel signal are encoded, then the decoder can perform reverberation processing on each subband to improve auditory quality, but a relatively large quantity of bits need to be occupied for encoding these parameters
Solution Approach 1:
The patent extracts and encodes only the necessary reverberation gain parameters for specific subbands rather than all subbands. The encoder determines which subbands require reverberation processing and encodes parameters only for those subbands, removing unnecessary encoding overhead while preserving essential auditory quality.
Solution Approach 2:
The patent applies partial action by selectively processing only certain subbands that benefit from reverberation effects. Instead of applying reverberation processing uniformly across all subbands, the system identifies and processes only the relevant portions, reducing bit overhead while maintaining auditory quality where needed.
2Productivity
If reverberation processing is performed on each subband of the channel signal, then the decoder can reconstruct the multi-channel signal, but in some cases this causes a worse auditory effect
Solution Approach 1:
The patent applies local quality by making different parts of the signal (different subbands) undergo different processing. Some subbands receive reverberation processing while others do not, based on their specific characteristics and requirements. This localized approach prevents uniform over-processing that degrades auditory quality.
Solution Approach 2:
The patent introduces dynamics by adaptively selecting which subbands require reverberation processing based on the signal characteristics. The system dynamically determines the appropriate processing for each subband rather than applying a static uniform processing approach, allowing optimal auditory quality across different frequency regions.
Data Source
AI summary
A multi-channel signal encoding method includes determining a downmixed signal of a first channel signal and a second channel signal in a multi-channel signal, and reverberation gain parameters corresponding to different subbands of the first channel signal and the second channel signal, where the obtained reverberation gain parameters are belonging to at least two reverberation gain parameter groups. The method further includes selecting, from the at least two reverberation gain parameter groups, a target reverberation gain parameter group. The method further includes generating parameter indication information, where the parameter indication information indicates the target reverberation gain parameter group. The method further includes encoding reverberation gain parameters corresponding to the target reverberation gain parameter group, the parameter indication information, and the downmixed signal to obtain a bitstream.