Title :
The hands-free telephone problem
Author :
Hänsler, Eberhard
Author_Institution :
Inst. fuer Netzwerk- und Signaltheorie, Tech. Hochschule Darmstadt, Germany
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;
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
DOI :
10.1109/ISCAS.1992.230436
