Patent · US Expired

Telephone having improved hands free operation audio quality and method of operation thereof

US6785381B2 · kind B2 · utility

35Cited by

5References

17Claims

0Family size

Assignee

Siemens Information and Communication Networks, Inc. · US

Inventors

Martin Gärtner · Worms, DE
Thomas Slagle · Boca Raton, US

Key dates

Filing date	Nov 27, 2001
Grant date	Aug 31, 2004
Priority date	—
Expiry date	Feb 19, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH04M1/6033
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A telephone having a hands-free mode of operation. The telephone includes a pair of microphones spaced apart from each other. Each microphone receives sound in hands-free mode of operation and provides audio signals representative of received sounds. The audio signals from each microphone may be converted to digital audio signals. The digital audio signals are presented to a fixed delay path and a variable delay path. Audio signals from both paths are combined and filtered in an adjustable filter to remove noise based upon a prior determination of the noise source location and the voice spectrum derived from the digital audio signals.

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