Patent · US Active

Multi-channel echo compensation system

US8130969B2 · kind B2 · utility

36Cited by

9References

28Claims

0Family size

Assignee

Nuance Communications, Inc. · US

Inventors

Markus Buck · Biberach, DE
Tim Haulick · Blaubeuren, DE
Martin Roessler · Ulm, DE
Gerhard Uwe Schmidt · Ulm, DE

Key dates

Filing date	Apr 16, 2007
Grant date	Mar 6, 2012
Priority date	—
Expiry date	Jan 4, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02D30/70
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An echo compensation system may remove undesirable audio signals. The echo compensation system may utilize adaptive filters to remove echoes and undesirable signals received by a microphone. The echo compensation system may inhibit adaptation of an adaptive filter when left and right channel audio signals are highly correlated. In a two-channel system, inhibiting adaptation of one of two adaptive filters may reduce computational power requirements, while still removing undesirable signals. In a four-channel system, inhibiting adaptation of all but one of the four adaptive filters may reduce computational power requirements by a greater percentage.

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