Broadside small array microphone beamforming unit

Details Broadside small array microphone beamforming unit Broadside small array microphone beamforming unit

2007-01-11

2010-12-07

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S071110, C381S094700, C704S233000

Reexamination Certificate

active

07848529

ABSTRACT:
A broadside small array microphone beamforming unit comprises a first omni-directional microphone to generate a signal X1(t), a second omni-directional microphone to generate a signal X2(t), a first delay unit delaying the signal X1(t) to generate a signal X1(t−T), a second delay unit delaying the signal X2(t) to generate a signal X2(t−T), a first substrator subtracting the signal X1(t−T) from the signal X2(t) to generate a signal R(t)=X2(t)−X1(t−T), a second substrator subtracting the signal X2(t−T) from the signal X1(t) to generate a signal L(t)=X1(t)−X2(t−T), a third delay unit delaying the signal R(t) to generate a signal R′(t)=R(t−D), a gain function unit convoluting the signal L(t) with a gain function G(t) to generate a signal L′(t)=L(t)*G(t−i), and a substrator subtracting the signal L′(t) from the signal R′(t) to generate a signal B′(t)=R′(t)−L′(t).

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PCT International Search Report, Apr. 4, 2008.

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