Patent · US Active

System for limiting receive audio

US7894598B2 · kind B2 · utility

2Cited by

4References

29Claims

0Family size

Assignee

Nuance Communications, Inc. · US

Inventors

Gerhard Uwe Schmidt · Ulm, DE
Tim Haulick · Blaubeuren, DE
Clarence Chu · Vancouver, CA
David Giesbrecht · Toronto, CA

Key dates

Filing date	Dec 14, 2004
Grant date	Feb 22, 2011
Priority date	—
Expiry date	May 14, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04M9/082
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A system for limiting a received audio signal in a communication system is provided. The receive audio signal is limited prior to being played over a loudspeaker to insure that the loudspeaker output will not be clipped when picked up by a nearby microphone associated with the communication system. By preventing clipping of the loudspeaker output at the microphone, the transfer function of the loudspeaker-enclosure-microphone system remains linear, facilitating accurate echo cancellation in the communication system.

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