Multi-Channel Audio Coding With Paired Equalization Parameters
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Solution Overview
Problem
Existing multi-channel audio coding technologies face challenges in reducing encoding bits of multi-channel side information to improve the quality of reconstructed signals on the decoder side.
Innovation Solution
Generate equalization side information for channel pairs based on the energy/amplitudes of audio signals, encoding this information along with the audio signals to form an encoded bitstream, thereby reducing the bits required for energy/amplitude equalization and allocating saved bits to improve the quality of the reconstructed audio signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If equalization side information is transmitted for all channels individually, then the completeness of side information is improved, but the bit quantity increases
Solution Approach 1:
The patent merges the equalization side information of paired channels into a single set of parameters. Specifically, for each channel pair (e.g., L and R channels), the encoder transmits only one set of equalization parameters that can be applied to both channels, rather than transmitting separate parameters for each channel. This combining approach maintains the necessary information for reconstructing both channels while significantly reducing the total bit quantity required for side information transmission.
2Measurement precision
If more bits are allocated to equalization side information, then the accuracy of energy/amplitude equalization is improved, but the bits available for audio signal encoding decrease
Solution Approach 1:
By merging equalization parameters for paired channels, the patent reduces the total bit consumption for side information. This bit savings is then reallocated to the audio signal encoding portion, allowing for higher precision audio representation. The merging strategy ensures that the equalization accuracy is maintained at an acceptable level while freeing up bits that can be invested in improving the audio signal quality.
Solution Approach 2:
The patent employs parameter quantization and optimization techniques to represent equalization side information more efficiently. By carefully selecting the precision level for equalization parameters and using optimized encoding schemes, the system achieves an optimal balance between equalization accuracy and bit consumption, allowing saved bits to be allocated to audio signal encoding.
Data Source
AI summary
Multi-channel audio signal encoding and decoding methods and apparatuses (1100, 1300) are provided. This can reduce a quantity of bits of multi-channel side information, so that saved bits can be allocated to another functional module of an encoder, to improve quality of a reconstructed audio signal of a decoder side and improve coding quality.