Scene Audio Decoding with Combined HOA Schemes for Lower Bit Rate
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Solution Overview
Problem
Higher-order ambisonics (HOA) signals face challenges in data amount and encoding performance, leading to high bit rate overheads and reduced encoding quality, which complicates transmission and storage.
Innovation Solution
A combination of encoding schemes, including a direct encoding scheme, spatial encoding scheme, and a de-correlation encoding scheme, is used to encode scene audio signals, balancing bit rate overheads and encoding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a direct encoding scheme is used to encode HOA signals, then encoding quality is improved, but bit rate overheads increase significantly
Solution Approach 1:
The patent segments the HOA signal encoding into multiple independent encoding schemes (first encoding scheme, second encoding scheme, third encoding scheme). Each scheme processes different aspects of the signal, allowing the system to select appropriate schemes for different signal components, thereby reducing overall bit rate requirements while maintaining encoding quality.
Solution Approach 2:
The patent employs a composite encoding approach by combining multiple encoding schemes (first, second, and third encoding schemes) to process the HOA signal. This composite methodology leverages the strengths of each individual scheme to achieve optimal balance between encoding quality and bit rate efficiency.
2Loss of information
If higher-order ambisonics signals are used to record more detailed sound scenes, then sound scene detail increases, but data amount increases accordingly
Solution Approach 1:
The patent extracts and processes different components of the HOA signal through separate encoding schemes. By identifying and processing specific signal components independently, the system can maintain detailed sound scene representation while reducing the overall data amount that needs to be transmitted or stored.
Solution Approach 2:
The patent applies different encoding parameters and processing methods to different components of the HOA signal. By changing encoding parameters adaptively based on signal characteristics, the system maintains high fidelity for important sound scene details while compressing less critical information.
3Manufacturing precision
If multiple encoding schemes are combined to encode scene audio signals, then encoding quality is maintained, but encoding complexity increases
Solution Approach 1:
The patent implements a dynamic encoding system where the selection and combination of encoding schemes can be adapted based on signal characteristics and requirements. This dynamic approach allows the system to use simpler schemes when appropriate and more complex schemes only when necessary, thereby managing encoding complexity while maintaining quality.
Solution Approach 2:
The patent uses copying mechanisms where certain signal components are processed by one encoding scheme and then reused or combined with results from other schemes. This reduces redundant processing and lowers overall encoding complexity while maintaining comprehensive signal representation.
Data Source
AI summary
A scene audio decoding method includes: receiving a bitstream; and decoding the bitstream based on a decoding scheme combination to obtain a reconstructed scene audio signal. The decoding scheme combination includes at least one of the following combinations: a combination of a first decoding scheme, a second decoding scheme, and a third decoding scheme, and a combination of the first decoding scheme and the third decoding scheme; and the first decoding scheme is decoding encoded data obtained by encoding a signal, the second decoding scheme is a spatial decoding scheme, and the third decoding scheme is a decoding scheme other than the first decoding scheme and the second decoding scheme.