Scene Audio Encoding with Hybrid HOA Schemes for Lower Bit Rate
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Solution Overview
Problem
Conventional higher-order ambisonics (HOA) signal encoding technologies face challenges in balancing encoding quality and bit rate overheads, with existing methods either requiring high bit rates for good quality or degrading quality for reduced rates.
Innovation Solution
A combination of encoding schemes is employed, including a direct encoding scheme, a spatial encoding scheme, and a channel copy or de-correlation encoding scheme, to optimize encoding quality while reducing bit rate overheads and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the first encoding scheme (direct encoding) is used, then encoding quality is improved, but bit rate overheads increase
Solution Approach 1:
The patent segments the HOA signal into multiple components (W matrix, HOA coefficients, and other channels) and applies different encoding schemes to different segments. The W matrix is encoded using the first encoding scheme to maintain quality, while other channels use the third encoding scheme to reduce bit rate, thus resolving the contradiction between encoding quality and bit rate overheads.
Solution Approach 2:
The patent applies different encoding qualities to different parts of the signal based on their importance. The W matrix, which contains critical spatial information, is encoded with high quality using the first encoding scheme, while less critical channels use the third encoding scheme, achieving local optimization of quality versus bit rate trade-off.
2Quantity of substance
If the second encoding scheme (spatial encoding) or third encoding scheme is used, then bit rate overheads are reduced, but encoding quality is degraded
Solution Approach 1:
The signal is divided into multiple channels with different encoding treatments. The W matrix uses the first encoding scheme to preserve quality, while other channels use the third encoding scheme to reduce bit rate, thus achieving overall bit rate reduction without severe quality degradation across the entire signal.
Solution Approach 2:
The patent combines multiple encoding schemes into a unified hybrid encoding framework. By merging the first encoding scheme (for quality-critical W matrix) and the third encoding scheme (for bit rate-efficient other channels), the system achieves both quality preservation and bit rate reduction simultaneously.
3Loss of information
If high-order HOA signals are used to record detailed sound scenes, then sound scene detail increases, but data amount increases creating transmission and storage challenges
Solution Approach 1:
The high-order HOA signal is segmented into multiple channels (W matrix and other channels), allowing selective application of different encoding schemes. This segmentation enables preservation of sound scene detail in critical components while reducing overall data amount through efficient encoding of other components.
Solution Approach 2:
The patent changes the encoding parameters applied to different parts of the HOA signal. By adjusting the encoding scheme parameters (using first encoding for W matrix and third encoding for other channels), the system optimizes the balance between preserving sound scene detail and reducing data amount for transmission and storage.
Data Source
AI summary
Embodiments of this application provide a scene audio encoding method and an electronic device. The method includes: first, obtaining a scene audio signal; and then encoding the scene audio signal based on an encoding scheme combination. The encoding scheme combination includes at least one of the following combinations: a combination of a first encoding scheme, a second encoding scheme, and a third encoding scheme, or a combination of the first encoding scheme and the third encoding scheme. The first encoding scheme is to encode a signal. The second encoding scheme is a spatial encoding scheme. The third encoding scheme is an encoding scheme other than the first encoding scheme and the second encoding scheme. This can reduce bit rate overheads and encoding complexity while ensuring encoding quality to some extent.