3D Down-Mix Signal Rendering for 2-Channel Spatial Audio
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Solution Overview
Problem
Existing audio signal processing technologies fail to efficiently reproduce multi-channel signals with 3D effects in various reproduction environments, particularly when using fewer channels, such as 2-channel speakers like headphones, which limits the immersive audio experience.
Innovation Solution
The proposed method involves a decoding and encoding process that includes extracting and determining down-mix signals, generating 3D down-mix signals through 3D rendering operations, and packaging these signals with spatial information into bitstreams, allowing for adaptive reproduction of multi-channel audio with 3D effects suitable for different environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-channel signals are reproduced using 2-channel speakers, then the reproduction environment flexibility is improved, but the 3D sound effect quality deteriorates
Solution Approach 1:
The patent applies parameter changes by transforming the down-mix signal through 3D rendering operations that modify signal parameters (spatial characteristics, channel distribution) to create 3D effects. The decoding apparatus dynamically adjusts signal processing parameters based on reproduction environment detection, enabling 2-channel speakers to produce 3D sound effects by changing how the signal is rendered rather than changing the physical speaker configuration.
2Manufacturing precision
If 3D rendering operation is always performed, then the 3D sound effect quality is improved, but the processing complexity and energy consumption increase
Solution Approach 1:
The patent implements dynamics by making the 3D rendering operation conditional rather than static. The decoding apparatus dynamically determines whether to perform 3D rendering based on detected reproduction environment characteristics and signal type identification. This dynamic approach allows the system to activate complex 3D processing only when beneficial (when 3D effects are needed and the environment supports it), while falling back to simpler processing in other cases, thus balancing quality with processing complexity.
Solution Approach 2:
The patent extracts and processes only the necessary components for 3D rendering rather than always processing the entire signal chain through 3D operations. By identifying down-mix signal characteristics and selectively applying 3D rendering only to appropriate signals, the system extracts and processes only the essential elements needed for 3D effect generation, reducing unnecessary processing complexity while maintaining 3D quality where needed.
3Productivity
If down-mix signal is transmitted without 3D rendering, then the transmission efficiency is improved, but the 3D sound effect capability is lost
Solution Approach 1:
The patent applies preliminary action by performing 3D rendering operations during the encoding phase rather than waiting for decoding. The encoding apparatus pre-processes the down-mix signal with 3D rendering and embeds the processed signal along with identification information in the bitstream. This preliminary processing ensures that 3D capability is preserved in the transmitted signal while maintaining transmission efficiency, as the heavy processing is done once during encoding rather than requiring continuous processing during playback.
Data Source
AI summary
An encoding method and apparatus and a decoding method and apparatus are provided. The decoding method includes extracting a down-mix signal and down-mix identification information from an input bitstream, determining, based on the down-mix identification information, whether the down-mix signal is a 3D down-mix signal obtained by performing a three-dimensional (3D) rendering operation, and if the down-mix signal is not 3D down-mix signal, generating a 3D down-mix signal by performing a 3D rendering operation. Accordingly, it is possible to efficiently encode multi-channel signals with 3D effects and to adaptively restore and reproduce audio signals with optimum sound quality according to the characteristics of an audio reproduction environment.