Patent ID: 7756278
Filing Date: 2010-07-13
Classification: H04R

Abstract:
1. A microphone system comprising: a planar array of microphones regularly spaced in a first axis according to pluralities of first spacings and regularly spaced in a second axis according to pluralities of second spacings, wherein the first and second axes are linear and nondegenerate; a plurality of adders, wherein the microphones regularly spaced in the first axis are connected to one adder and the microphones regularly spaced in the second axis are connected to another adder; a plurality of first filters, each first filter connected to receive an output of a corresponding adder of the plurality of adders; an output adder connected to generate a combined signal by summing outputs of the first filters; and a plurality of second filters, each second filter connecting a corresponding microphone to a corresponding one of the plurality of adders; wherein a first set of microphones is configured to produce cardioid pickups in a first direction; and wherein a second set of microphones is configured to produce cardioid pickups in a second direction opposite the first direction such that the planar array establishes equal angular resolution in both the first and second directions.