Scene Audio Decoding with Adaptive HOA Scheme Combinations
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Solution Overview
Problem
Higher-order ambisonics (HOA) signals face challenges in encoding and decoding due to increased data amounts, leading to inefficiencies in transmission and storage, and existing technologies struggle with low encoding performance and high bit rates.
Innovation Solution
A scene audio encoding method that selects an encoding scheme combination from a pre-established set based on scene information, combining different encoding schemes for channels to balance encoding quality and bit rate, and a decoding method that determines a decoding scheme combination for efficient audio reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the HOA order quantity increases to record more detailed sound scene information, then the information completeness improves, but the data amount increases creating challenges in transmission and storage
Solution Approach 1:
The patent segments the HOA signal encoding process by applying different encoding schemes to different channels. Specifically, it divides the channel group into first channel group and second channel group, applying first encoding scheme to first channels and second encoding scheme to second channels, thereby managing the large data amount through structured segmentation while preserving comprehensive sound scene information
Solution Approach 2:
The patent applies local quality by using different encoding schemes for different channels within the same HOA signal. The first encoding scheme and second encoding scheme are selectively applied to different channel groups based on their specific characteristics, optimizing the balance between information preservation and data reduction for each channel locally
2Device complexity
If a single encoding scheme is used for all channels, then the device complexity is reduced, but the encoding performance deteriorates
Solution Approach 1:
The patent achieves universality by designing a multi-functionality encoding system that can adaptively select between first encoding scheme and second encoding scheme based on channel characteristics. The encoding device universally handles different channel types through a unified framework that automatically applies the appropriate encoding scheme, maintaining both complexity management and performance optimization
Solution Approach 2:
The patent implements dynamics by making the encoding scheme selection adaptive rather than static. The system dynamically determines which encoding scheme to apply to each channel group based on the specific characteristics of the HOA signal and channel properties, allowing the encoding approach to flexibly adapt to different scenarios while managing overall system complexity
3Manufacturing precision
If high encoding rate is used to maintain audio quality, then the quality is preserved, but the bit rate increases creating transmission and storage challenges
Solution Approach 1:
The patent applies parameter changes by varying the encoding scheme parameters across different channels. By changing the encoding approach (first encoding scheme vs. second encoding scheme) for different channel groups, the system optimizes the balance between audio quality preservation and bit rate reduction, achieving high quality output with reduced overall bit rate requirements
Data Source
AI summary
A scene audio decoding method includes receiving a bitstream, determining, from a decoding scheme set, a decoding scheme combination that corresponds to the bitstream, where the decoding scheme set includes a plurality of decoding scheme combinations, and decoding the bitstream based on the decoding scheme combination that corresponds to the bitstream to obtain a reconstructed scene audio signal.