Phased-array sound pickup apparatus

Details Phased-array sound pickup apparatus Phased-array sound pickup apparatus

1983-08-19

1985-12-17

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Directive circuits for microphones

179121D, 340709, 340713, 340720, 340724, 358108, 367129, 381122, H04R 120, H04R 140

Patent

active

045596425

ABSTRACT:
A phased-array sound pickup apparatus has an array of directional microphones having individual directivity patterns equally oriented in a given direction. The directivity patterns of the microphones combine into the main lobe of the array. A plurality of variable delay circuits are connected to be responsive respectively to individual signals from the microphones for providing incremental delays to the individual signals and combining the delayed signals for delivery as an output of the apparatus. A delay control circuit is coupled to the variable delay circuits for generating a delay control signal for controlling the amount of the incremental delays to cause the main lobe to be steered at an angle to the given direction as a function of the delay control signal.

REFERENCES:
patent: 2896189 (1959-06-01), Wiggins
patent: 3859621 (1975-01-01), Foreman
patent: 4311874 (1982-01-01), Wallace, Jr.
patent: 4421957 (1983-12-01), Wallace, Jr.
patent: 4455630 (1984-06-01), Loonen

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