Multi-channel decorrelator, multi-channel audio decoder, multi-channel audio encoder, methods and computer program using a premix of decorrelator input signals

Simple SummaryContent extracted from patent full text and abstract with AI.

This patent describes an advanced multi-channel audio decorrelator designed to efficiently generate multiple decorrelated audio output signals from a set of input signals. The core innovation is a process that first 'premixes' or combines multiple input signals into a reduced set, applies decorrelation to this smaller set, and then 'upmixes' them back to the desired output number. This method enables effective control over the computational complexity and quality of multi-channel audio processing systems, such as in immersive audio encoding and decoding, by flexibly balancing resource use and output quality.

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

• Immersive audio systems for home theaters or cinemas that support formats such as 5.1, 7.1, and 22.2 surround sound.
• 3D audio rendering in virtual reality (VR) and augmented reality (AR) headsets requiring spatial audio with low-latency processing.
• Real-time audio streaming, broadcasting, or conferencing applications where network or device computational resources are limited.
• Professional audio post-production workflows that demand efficient and flexible multi-channel decorrelation for object-based audio.
• Portable or embedded consumer audio devices (smart speakers, soundbars, mobile devices) where processing power and energy efficiency are critical.
• Gaming systems that utilize real-time spatial audio rendering for more immersive experiences.

BenefitsContent extracted from patent full text and abstract with AI.

• Significant reduction in required processing power and computational complexity for multi-channel decorrelation, enabling implementation on resource-constrained devices.
• Ability to flexibly adjust the level of decorrelation depending on available resources or desired audio quality, including stepwise complexity adjustment.
• High compatibility across different output configurations and channel layouts (from stereo to complex 3D/immersive audio setups).
• Improved perceptual audio quality by intelligently selecting which channels to combine during premixing, preserving important spatial cues.
• Efficient and adaptable signaling between encoders and decoders to optimize processing settings for different audio content and playback scenarios.
• Supports both traditional channel-based and next-generation object-based audio systems, increasing future-proofing of audio products.

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Patent Abstract

A multi-channel decorrelator for providing a plurality of decorrelated signals on the basis of a plurality of decorrelator input signals is configured to premix a first set of N decorrelator input signals into a second set of K decorrelator input signals, wherein KK'. The multi-channel decorrelator can be used in a multi-channel audio decoder. A multi-channel audio encoder provides complexity control information for the multi-channel decorrelator.