Microphone circuits having adjustable directivity patterns...

Details Microphone circuits having adjustable directivity patterns... Microphone circuits having adjustable directivity patterns...

2006-06-27

2006-06-27

Pendleton, Brian T. (Department: 2615)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S094700

Reexamination Certificate

active

07068797

ABSTRACT:
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.

REFERENCES:
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patent: 6549627 (2003-04-01), Rasmusson et al.
patent: 6760450 (2004-07-01), Matsuo
patent: 2001/0028720 (2001-10-01), Hou
patent: 2003/0039353 (2003-02-01), Matsuo
patent: WO 01/24575 (2001-04-01), None
International Search Report corresponding to PCT/EP2004/003054; Date of Mailing: Jun. 28, 2004.
Kuo et al., “Acoustic Noise and Echo Cancellation Microphone System for Videoconferencing,”IEEE Transactions on Consumer Electronics, 41(4): 1150-1158 (1995).

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