DocumentCode
285708
Title
The hands-free telephone problem
Author
Hänsler, Eberhard
Author_Institution
Inst. fuer Netzwerk- und Signaltheorie, Tech. Hochschule Darmstadt, Germany
Volume
4
fYear
1992
fDate
3-6 May 1992
Firstpage
1914
Abstract
The author describes the problem of providing the means for a comfortable hand-free telephone conversation. After a report on conventional schemes the properties of a loudspeaker-enclosure-microphone system are discussed. It is shown that for a truly two-way conversation the decoupling of the loudspeaker and the microphone requires an adaptive filter with an impulse response of several hundreds of milliseconds in duration. The attempts to solve the adaptation problem are outlined
Keywords
adaptive filters; loudspeakers; microphones; telephone sets; adaptive filter; hands-free telephone; impulse response; loudspeaker-enclosure-microphone system; two-way conversation; Acoustic signal processing; Adaptive filters; Digital signal processing; Digital signal processors; Frequency estimation; Loudspeakers; Microphones; Speech; Switches; Telephony;
fLanguage
English
Publisher
ieee
Conference_Titel
Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on
Conference_Location
San Diego, CA
Print_ISBN
0-7803-0593-0
Type
conf
DOI
10.1109/ISCAS.1992.230436
Filename
230436
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