Adaptive IPD Extraction for Multi-Channel Audio Coding
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Solution Overview
Problem
Existing IPD parameter extraction methods for stereo audio either consume excessive resources or compromise on accuracy and coding quality, as they either calculate multiple subband IPD parameters or rely on a single Group IPD parameter, respectively.
Innovation Solution
An IPD parameter extraction method and apparatus that enriches the choice of extraction manners by determining the appropriate IPD parameter extraction manner based on signal feature parameters, allowing for better maintenance of phase information and improved audio coding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If IPD parameter is calculated for each subband, then phase information accuracy is improved, but resource consumption increases and coding rate decreases
Solution Approach 1:
The patent divides the frequency spectrum into multiple subbands and calculates IPD parameters for each subband separately. This segmentation allows precise phase information extraction in different frequency regions while enabling selective encoding strategies to maintain acceptable coding rates.
Solution Approach 2:
The patent applies different encoding precision levels to different subbands based on their importance. Critical subbands receive higher precision IPD parameter encoding, while less critical subbands use lower precision, optimizing the balance between phase information accuracy and coding rate.
2Productivity
If only one Group IPD parameter is extracted, then resource consumption is reduced, but phase information accuracy and coding quality deteriorate
Solution Approach 1:
Instead of extracting a single Group IPD parameter, the patent segments the frequency spectrum into multiple subbands and extracts IPD parameters for each subband. This provides more detailed phase information while managing resource consumption through selective encoding.
Solution Approach 2:
The patent changes the parameter representation from a single Group IPD value to multiple subband-specific IPD parameters. This transformation enables more accurate phase information extraction by capturing frequency-dependent phase characteristics that a single parameter cannot represent.
3Reliability
If multiple subband IPD parameters are calculated, then coding quality is improved, but resource consumption and computational complexity increase
Solution Approach 1:
The patent segments the frequency spectrum into subbands and calculates IPD parameters for each segment. This segmentation improves coding quality by capturing frequency-specific phase information while reducing computational complexity compared to analyzing the entire spectrum uniformly.
Solution Approach 2:
The patent calculates IPD parameters for all subbands but applies partial encoding, where only certain subbands are fully encoded with high precision while others use lower precision or are skipped. This partial action maintains good coding quality while controlling resource consumption and computational complexity.
Data Source
AI summary
An inter-channel phase difference (IPD) parameter extraction method includes obtaining a parameter for obtaining an information extraction manner for a current frame of a multi-channel signal; obtaining an IPD parameter extraction manner for the current frame based on the parameter for obtaining the information extraction manner, where the obtained IPD parameter extraction manner is one of at least two preset IPD parameter extraction manners; and obtaining an IPD parameter of the current frame based on the obtained IPD parameter extraction manner for the current frame.