A multi-channel audio encoder, decoder, methods and computer program for switching between a parametric multi-channel operation and an individual channel operation

The multi-channel audio encoder adapts between parametric and individual encoding based on input characteristics, addressing stereo image reproduction and speech intelligibility issues with interfering talkers, enhancing encoding performance.

AU2020250906B2Pending Publication Date: 2026-07-23FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
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Patent Information

Authority / Receiving Office
AU · AU
Patent Type
Applications
Current Assignee / Owner
FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
Filing Date
2020-04-02
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Conventional parametric stereo techniques fail to accurately reproduce stereo images and deliver intelligible speech in scenarios with interfering talkers, especially when talkers have different ITDs and are positioned oppositely, violating core coding models and degrading perceptual quality.

Method used

A multi-channel audio encoder that switches between parametric and individual encoding based on characteristics of the input audio representation, such as ITD deviations and dominant sources, using parameters like inter-channel time difference and cross-correlation to adapt encoding to the input audio conditions.

Benefits of technology

Enhances encoding performance by selectively choosing the most suitable encoding method, improving perceived quality and accuracy in handling multiple talkers or single-source scenarios.

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Abstract

A multi-channel audio encoder (100) for providing an encoded audio representation (112) on the basis of an input audio representation (110) is provided. The multi-channel audio encoder (100) is configured to switch (140) between a parametric multi-channel encoding (120) of a plurality of channels and an individual encoding (130) of a plurality of channels in dependence on characteristics of the input audio representation (110).
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