Audio Decorrelator, Processing System and Method for Decorrelating an Audio Signal

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This patent describes an audio decorrelator, system, and method designed to efficiently process audio signals to produce decorrelated outputs, enabling high-quality spatial effects (e.g., stereo from mono). The core invention utilizes multiple delay units that operate on frequency components of an audio signal in parallel, followed by an envelope shaper that adjusts energy levels. The method features low processing delay, low computational complexity, and effective handling of transient audio portions to guard against unwanted artifacts (such as echoes or pre-echoes), making it highly suitable for real-time audio processing and spatial audio rendering.

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

• Stereo upmixing from mono audio (e.g., for broadcasting, music production, or consumer audio playback devices).
• Parametric spatial audio coding and multi-channel audio rendering.
• Improved audio spatialization and immersive sound in virtual or augmented reality applications.
• Real-time audio streaming and conferencing systems needing low-latency spatial audio effects.
• Object-based audio in film, gaming, or interactive media environments.
• Source extent/enhanced soundstage modeling for loudspeakers or headphones.
• Software-defined audio processing pipelines or plugins (e.g., for DAWs or live sound).

BenefitsContent extracted from patent full text and abstract with AI.

• Low processing delay enables use in latency-sensitive and real-time audio applications.
• Low computational complexity allows efficient use on embedded systems or portable devices.
• Improved sound quality with effective decorrelation, reducing perceptible artifacts.
• Configurable structure allows adaptation for various frequency bands and application requirements.
• Enhanced transient handling minimizes unwanted echoes and maintains audio clarity.
• Direct interfacing with subsequent spatial processing for efficient computational pipelines.
• Scalable and flexible design suitable for a wide range of professional and consumer audio technologies.

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Patent Abstract

A decorrelator comprises a plurality of delay units, wherein each delay unit is configured for receiving a part of a frequency representation being based on an audio signal, wherein each delay unit is configured for delaying the received part to provide a delayed part. The decorrelator comprises an envelope shaper configured for receiving and combining signals being based on the delayed parts of the frequency representation. The envelope shaper receives the frequency representation of the audio signal and is configured for adjusting an energy of the delayed parts in respect of the frequency representation of the audio signal. The envelope shaper is configured for providing a combined shaped frequency representation. Transient signal portions are handled by an adapted operation of the decorrelator.