Audio coherence enhancement by controlling time variant weighting factors for decorrelated signals

US10242692B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Christian Uhle · Nuremberg, DE
• Patrick Gampp · Erlangen, DE
• Oliver Hellmuth · Erlangen, DE
• Stefan Varga · Cologne, DE
• Sebastian Scharrer · Altdorf, DE

Key dates

• Filing date: Jan 24, 2017
• Grant date: Mar 26, 2019
• Expiry date: Jan 28, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/0264
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for enhancing an audio signal includes a signal processor for processing the audio signal in order to reduce or eliminate transient and tonal portions of the processed signal and a decorrelator for generating a first decorrelated signal and a second decorrelated signal from the processed signal. The apparatus further includes a combiner for weightedly combining the first and the second decorrelated signal and the audio signal or a signal derived from the audio signal by coherence enhancement using time variant weighting factors and to obtain a two-channel audio signal. The apparatus further includes a controller for controlling the time variant weighting factors by analyzing the audio signal so that different portions of the audio signal are multiplied by different weighting factors and the two-channel audio signal has a time variant degree of decorrelation.