Multi-Channel Encoding with Correlation-Based Gain Adjustment
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Solution Overview
Problem
Existing stereo audio encoding methods, particularly those using parametric stereo encoding, fail to effectively adjust reverberation gain parameters based on the correlation between channel signals, leading to poor auditory effects when the correlation is low.
Innovation Solution
A multi-channel signal encoding method that determines a target reverberation gain parameter by considering the correlation between channel signals and a downmixed signal, adjusting the initial gain parameter using an attenuation factor to improve the quality of reverberation processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If reverberation processing is performed based on initial reverberation gain parameters without considering channel-signal correlation, then the encoding process is simple, but the auditory effect deteriorates when correlation is low
Solution Approach 1:
The patent applies dynamics by making the reverberation gain parameter adjustable based on channel-signal correlation. The system transitions from using fixed initial reverberation gain parameters to dynamically adjusted target reverberation gain parameters that adapt to the actual correlation between channel signals and downmixed signals, thereby improving auditory effect quality without significantly complicating the encoding process
Solution Approach 2:
The patent changes the reverberation gain parameter from a fixed initial value to a dynamically adjusted target value based on channel-signal correlation. By calculating correlation values and using attenuation factors to adjust the gain parameters, the system optimizes reverberation processing quality while maintaining encoding efficiency
2Reliability
If target reverberation gain parameters are determined by considering channel-signal correlation, then auditory effect quality is improved, but the encoding complexity increases
Solution Approach 1:
The patent applies partial action by selectively adjusting reverberation gain parameters only when channel-signal correlation indicates it is necessary. The system calculates correlation values and applies attenuation factors selectively, rather than universally adjusting all parameters, thereby improving quality while limiting the increase in encoding complexity to only what is necessary
Solution Approach 2:
The patent uses feedback by calculating the correlation between channel signals and downmixed signals, then using this correlation information to adjust the reverberation gain parameters. This closed-loop approach ensures that parameters are optimized based on actual signal characteristics, improving auditory effect quality while maintaining encoding efficiency through intelligent, data-driven adjustments
Data Source
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AI summary
A multi-channel signal encoding method, a multi-channel signal decoding method, an encoder, and a decoder are provided. The encoding method includes: determining a downmixed signal of a first channel signal and a second channel signal in a multi-channel signal, an initial reverberation gain parameter of the first channel signal and the second channel signal; determining a target reverberation gain parameter of the first channel signal and the second channel signal based on a correlation between the first channel signal and the downmixed signal, a correlation between the second channel signal and the downmixed signal, and the initial reverberation gain parameter; and quantizing the first channel signal and the second channel signal based on the downmixed signal and the target reverberation gain parameter, and writing a quantized first channel signal and a quantized second channel signal into a bitstream. Quality of a channel signal obtained after reverberation processing can be improved according to the encoding method, the decoding method, the encoder, and the decoder.