Multi-Channel Audio Encoding Using Coherence-Based Reverberation Selection
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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 and increased bit overhead, especially when coherence between channel signals is low, resulting in distorted restored signals.
Innovation Solution
A method that determines a target reverberation gain parameter based on energy and coherence between channel signals, selectively encoding only necessary subbands, reducing bit overhead and improving encoding efficiency by allocating saved bits to the downmixed signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reverberation gain parameters corresponding to all subbands are encoded, then the auditory quality is improved, but the bit overhead increases significantly
Solution Approach 1:
The patent extracts and encodes only the necessary reverberation gain parameters corresponding to specific subbands where they are needed, rather than encoding all subbands. This selective extraction reduces bit overhead while maintaining auditory quality in critical frequency regions.
Solution Approach 2:
The patent applies different encoding strategies to different subbands based on their local characteristics. Reverberation gain parameters are encoded only in subbands where they contribute to auditory quality, while other subbands use default or simplified processing, creating localized optimization throughout the frequency spectrum.
2Reliability
If reverberation gain parameters corresponding to all subbands are encoded, then the encoding completeness is improved, but the encoding efficiency deteriorates
Solution Approach 1:
The patent extracts only the essential reverberation gain parameters that are necessary for accurate decoding, removing redundant parameters from the encoding process. This maintains encoding completeness for critical information while improving encoding efficiency by reducing the total number of parameters to process.
Solution Approach 2:
The patent applies partial action by encoding reverberation gain parameters for only some subbands rather than all subbands. This selective approach maintains sufficient encoding completeness for perceived audio quality while significantly improving encoding efficiency by reducing computational load.
3Measurement precision
If reverberation processing is performed on each subband, then the signal fidelity is improved, but the bit allocation efficiency deteriorates
Solution Approach 1:
The patent applies reverberation processing selectively to specific subbands where it most benefits signal fidelity, rather than uniformly applying it to all subbands. This localized approach maintains high signal fidelity in critical frequency regions while improving bit allocation efficiency by concentrating processing resources where they are most effective.
Solution Approach 2:
The patent changes the reverberation gain parameters selectively for different subbands based on their characteristics and importance. By adjusting these parameters locally rather than globally, the patent maintains signal fidelity where needed while optimizing bit allocation across the entire audio spectrum.
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, determining a target reverberation gain parameter that needs to be encoded in the reverberation gain parameters corresponding to the different subbands of the first channel signal and the second channel signal, generating parameter indication information, where the parameter indication information is used to indicate a subband corresponding to the target reverberation gain parameter, and encoding the target reverberation gain parameter, the parameter indication information, and the downmixed signal to generate a bitstream.