Scene Audio Decoding With Transient-Aware Channel Reconstruction
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Solution Overview
Problem
Existing three-dimensional audio technologies, particularly higher-order ambisonics (HOA), face challenges in efficiently encoding and decoding scene audio signals due to the large amount of data required, leading to difficulties in transmission and storage, and neglecting the processing of transient signals which deteriorates the quality of reconstructed audio and user experience.
Innovation Solution
A method and apparatus for scene audio signal decoding that includes transient signal processing by identifying channels with transient signals and applying direct decoding, spatial decoding, or de-correlation based on transient identifiers, to improve the quality of reconstructed audio signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher-order ambisonics (HOA) is used to record more detailed sound scene information, then audio quality and spatial information are improved, but data quantity increases making transmission and storage difficult
Solution Approach 1:
The patent divides the HOA channels into two groups: first channels (directly decoded) and second channels (spatially decoded). This segmentation allows different processing methods for different channels, reducing overall data processing load while maintaining audio quality. The transient signal processing is applied selectively to channels where needed, optimizing the balance between quality and data management.
Solution Approach 2:
The patent applies different decoding methods to different channels based on their specific characteristics. First channels receive direct decoding while second channels receive spatial decoding. Transient signal processing is applied locally to channels where transient signals are detected, rather than uniformly across all channels. This local quality approach optimizes audio reconstruction quality for each channel according to its specific signal characteristics.
2Productivity
If part of channels are encoded and decoded to reduce bitstream size, then encoding efficiency is improved, but transient signal processing is neglected resulting in deteriorated audio quality
Solution Approach 1:
The patent performs transient signal detection in advance during the encoding process, before the actual decoding. By detecting transient signals and creating corresponding identifiers beforehand, the system can prepare appropriate processing methods ahead of time. This preliminary action allows efficient encoding while ensuring that transient signals receive special processing attention during decoding, preventing quality deterioration.
Solution Approach 2:
The patent implements a feedback mechanism where transient signal detection results are fed back into the decoding process. The transient identifiers generated during encoding guide the decoding process to apply appropriate processing to channels with transient signals. This feedback loop ensures that encoding efficiency is maintained while audio quality is preserved through targeted transient signal processing.
Data Source
AI summary
A scene audio signal decoding method is provided, including: obtaining a transient identifier of a first channel in a to-be-reconstructed scene audio signal, where the to-be-reconstructed scene audio signal includes C channels, the C channels include a channel on which direct decoding is performed and a channel on which direct decoding is not performed, the first channel is a channel on which direct decoding is not performed, the transient identifier indicates whether a transient signal exists on the corresponding channel, and C is a positive integer; and obtaining a reconstructed signal with the first channel when the transient identifier indicates that a transient signal exists on the first channel. According to this method, a transient signal in a scene audio signal can be processed, to improve quality of a reconstructed scene audio signal and auditory experience of a user.