Spatial Cue Rendering Control in Multi-Channel Audio Decoding
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Solution Overview
Problem
Conventional methods for rendering multi-object or multi-channel audio signals lack flexibility in controlling the spatial positioning of audio signals during decoding, relying on fixed positions and limited control over spatial cues.
Innovation Solution
An apparatus and method that includes a decoder and a spatial cue renderer, which decodes down-mixed audio signals and controls spatial cues like Channel Level Difference (CLD), Channel Prediction Coefficient (CPC), and Inter-Channel Correlation (ICC) to dynamically adjust the rendering of multi-object or multi-channel audio signals, allowing for flexible positioning based on user input or external control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional SAC decoding is used, then audio signals can be decoded from down-mixed signals, but the spatial positioning of audio signals is fixed and cannot be dynamically controlled
Solution Approach 1:
The decoding system is segmented into independent functional modules: a decoder for basic signal recovery, and a separate spatial cue renderer for independent control of spatial parameters. This segmentation allows flexible spatial positioning control without complicating the core decoding structure, as each module performs its specialized function independently.
Solution Approach 2:
The patent introduces dynamic control of spatial cues (CLD, CPC, ICC) that were previously fixed during decoding. The spatial cue renderer dynamically adjusts these parameters based on input signals, enabling real-time spatial positioning control while maintaining the stability of the core decoding process through standardized interfaces.
2Ease of operation
If spatial cue information is transmitted from encoder, then sound quality is improved, but control over rendering positions is limited
Solution Approach 1:
The encoder performs preliminary extraction and transmission of spatial cue information (CLD, CPC, ICC) during the encoding phase. This preliminary action preserves complete spatial information for later use, enabling flexible control during decoding without losing spatial cue data, as the information is prepared in advance and transmitted separately from the audio signal.
3Productivity
If multi-channel audio signals are down-mixed and transmitted, then transmission efficiency is improved, but rendering control flexibility is reduced
Solution Approach 1:
Spatial cue information acts as an intermediary between the down-mixed audio signal and the original multi-channel rendering. The spatial cues (CLD, CPC, ICC) carry the necessary spatial information that mediates between the compressed transmission format and the flexible rendering control, enabling high transmission efficiency while maintaining full rendering flexibility through this intermediate information layer.
Data Source
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AI summary
The present research relates to controlling rendering of multi-object or multi-channel audio signals. The present research provides a method and apparatus for controlling rendering of multi-object or multi-channel audio signals based on spatial cues in a process of decoding the multi-object or multi-channel audio signals. To achieve the purpose, the method suggested in the research controls rendering in a spatial cue domain in the process of decoding the multi-object or multi-channel audio signals.