Multi-channel Audio Decoder, Multi-Channel Audio Encoder, Methods, Computer Program and Encoded Audio Representation Using a Decorrelation of Rendered Audio Signals

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This patent presents an improved multi-channel audio decoder and encoder technology for spatial (including 3D) audio systems. The invention introduces a new method for applying decorrelation to rendered audio signals after decoding but before output, enabling more accurate and efficient reconstruction of spatial audio scenes. By adding specially processed 'decorrelated' signals to the rendered output, the system compensates for signal losses and spatial inaccuracies caused during compression and parametric reconstruction, improving audio quality while managing computational complexity. The technology supports flexible output formats (e.g., 5.1, 7.1, 22.2) and can adjust processing according to desired sound characteristics and device constraints.

Use CasesContent extracted from patent full text and abstract with AI.

• Consumer electronics: Home theater systems, soundbars, and headphones to provide immersive 3D or multi-channel audio experiences.
• Professional audio production: Broadcasting, film, and music production that require precise spatial sound rendering and manipulation.
• Gaming: Enhancing spatial awareness and immersion in video games with real-time, optimized 3D audio environments.
• Virtual and augmented reality: Delivering convincing virtual and augmented audio scenes for VR/AR headsets and platforms.
• Streaming services: Efficiently transmitting high-quality, space-accurate audio in bandwidth-constrained settings such as online video or music streaming.
• Mobile devices: Smartphones and tablets needing efficient multi-channel playback without significant battery or computing resource impact.

BenefitsContent extracted from patent full text and abstract with AI.

• Improved perceptual audio quality: Restores accurate energy levels and spatial cues lost during encoding, resulting in a more convincing and immersive listening experience.
• Flexible and scalable: Supports any number of input/output channels, enabling easy adaptation to various audio configurations and end devices.
• Efficient processing: Reduces computational complexity by performing decorrelation after rendering and by offering adjustable processing modes and levels.
• Lower bitrate/high compression efficiency: Maintains or improves perceived audio quality using fewer data, making it suitable for streaming and storage-constrained applications.
• Artifact reduction: Minimizes audio artifacts (such as spatial blurring or unnaturalness) that occur with conventional pre-render decorrelation methods.
• Configurable tradeoff: Allows systems to dynamically balance between quality, computational cost, and complexity based on real-time constraints or listener preferences.

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Patent Abstract

A multi-channel audio decoder for providing at least two output audio signals on the basis of an encoded representation is configured to render a plurality of decoded audio signals, which are obtained on the basis of the encoded representation, in dependence on one or more rendering parameters, to obtain a plurality of rendered audio signals. The multichannel audio decoder is configured to derive one or more decorrelated audio signals from the rendered audio signals, and to combine the rendered audio signals, or a scaled version thereof, with the one or more decorrelated audio signals, to obtain the output audio signals. A multi-channel audio encoder provides a decorrelation method parameter to control an audio decoder.