Patent · US Active

Extraction of reverberant sound using microphone arrays

US9984702B2 · kind B2 · utility

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16Claims

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Assignee

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

Inventors

Oliver Thiergart · Forchheim, DE
Emanuel Habets · Spardorf, DE

Key dates

Filing date	Jun 9, 2016
Grant date	May 29, 2018
Priority date	—
Expiry date	Jun 9, 2036

Classification

Technology area (CPC H)Electricity
CPC primaryH04S2420/01
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A method includes estimating a spatial coherence between a first diffuse sound portion in a first microphone signal and a second diffuse sound portion in a second microphone signal. The first microphone signal is captured by a first microphone and the second microphone signal is captured by a second microphone which is spaced apart from the first microphone in a known manner. The method further includes defining a linear constraint for filter coefficients of a diffuse sound filter, the linear constraint being based on the spatial coherence. The method also includes calculating at least one of signal statistics and noise statistics over the first microphone signal and the second microphone signal. The method also includes determining the filter coefficients of the diffuse sound filter by solving an optimization problem concerning at least one of the signal statistics and noise statistics while considering the linear constraint for the filter coefficients.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.