MICROPHONE CIRCUIT HAVING ADJUSTABLE DIRECTIVITY PATTERN FOR REDUCING LOUDSPEAKER FEEDBACK AND METHOD OF OPERATING THE SAME

WIPO Patent Application WO/2004/105371

A1

A microphone circuit includes a first microphone, a second microphone, an adjustable delay unit, and a combiner. The first microphone generates a first microphone signal that includes a contribution associated with an output signal that is generated by a loudspeaker in response to an input signal. The second microphone generates a second microphone signal that includes a contribution associated with the output signal from the loudspeaker. The adjustable delay unit delays the second microphone signal relative to the first microphone signal by a delay value. The combiner combines the delayed second microphone signal and the first microphone signal to provide a combined microphone signal. The adjustable delay unit adjusts the delay value so as to reduce at least a portion of the contribution to the combined microphone signal that is associated with the output signal from the loudspeaker.

GUSTAVSSON STEFAN (SE)
ISBERG PETER (SE)

PCT/EP2004/003054

December 02, 2004

March 23, 2004

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SONY ERICSSON MOBILE COMM AB (SE)
GUSTAVSSON STEFAN (SE)
ISBERG PETER (SE)

H04M9/08; H04R3/00; (IPC1-7): H04M9/08

US6549627B1

2003-04-15

KUO S M ET AL: "ACOUSTIC NOISE AND ECHO CANCELLATION MICROPHONE SYSTEM FOR VIDEOCONFERENCING", IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, IEEE INC. NEW YORK, US, vol. 41, no. 4, 1 November 1995 (1995-11-01), pages 1150 - 1158, XP000553493, ISSN: 0098-3063

Pettersson, Jenny (IPR Department Nya Vattentornet, Lund, SE)

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