Patent · US Active

Multi-channel adaptive speech signal processing system with noise reduction

US8194872B2 · kind B2 · utility

20Cited by

1References

24Claims

0Family size

Assignee

Nuance Communications, Inc. · US

Inventors

Markus Buck · Biberach, DE
Tim Haulick · Blaubeuren, DE
Phillip A. Hetherington · Port Moody, CA
Pierre Zakarauskas · Vancouver, CA

Key dates

Filing date	Sep 23, 2005
Grant date	Jun 5, 2012
Priority date	—
Expiry date	Feb 3, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04R2499/13
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

An adaptive signal processing system eliminates noise from input signals while retaining desired signal content, such as speech. The resulting low noise output signal delivers improved clarity and intelligibility. The low noise output signal also improves the performance of subsequent signal processing systems, including speech recognition systems. An adaptive beamformer in the signal processing system consistently updates beamforming signal weights in response to changing microphone signal conditions. The adaptive weights emphasize the contribution of high energy microphone signals to the beamformed output signal. In addition, adaptive noise cancellation logic removes residual noise from the beamformed output signal based on a noise estimate derived from the microphone input signals.

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