ACOUSTIC CONVERTER WITH SPATIAL RANGE SELECTIVITY Russian patent published in 1995 - IPC

FIELD: electroacoustics. SUBSTANCE: acoustic converter has eight pressure microphones. First four of them are connected to inputs of adder through amplifier and second four are linked to other inputs of adder through inverters and amplifiers connected in aeries. Pressure microphones are located in vertexes of cube so that microphones connected in antiphase are positioned on each rib of cube. Distance h between microphones amounts to value smaller or equal to quarter (lambda) of minimal length of wave of working range. EFFECT: enhanced operational efficiency. 2 dwg