Digital and analog directional microphone

Details Digital and analog directional microphone Digital and analog directional microphone

1997-12-22

2000-07-04

Lee, Ping

Electrical audio signal processing systems and devices

Directive circuits for microphones

381 947, H04R 300

Patent

active

060849738

ABSTRACT:
A directional microphone is disclosed. The shotgun microphone has an elongated tube which is designed to control directivity at frequencies above a predetermined frequency and at least four reference microphones spatially arranged about said shotgun microphone. A signal processor, which is electrically connected to said shotgun and reference microphones, generates interference cancelling signals from the portions of the signals from the reference microphones which have frequencies generally below the predetermined frequency. The signal processor combines the cancelling signals with the signal from the shotgun microphone to generate an output signal in which signals originating from in front of the directional microphone in a direction along the longitudinal axis of said tube are enhanced and signals originating from locations other than in front of the directional microphone in a direction along the longitudinal axis of said tube are suppressed.

REFERENCES:
patent: 4555598 (1985-11-01), Flanagan et al.
patent: 4723294 (1988-02-01), Taguchi
patent: 5581495 (1996-12-01), Adkins et al.
patent: 5715319 (1998-02-01), Chu
patent: 5740256 (1998-04-01), Castello Da Costa et al.
patent: 5825898 (1998-10-01), Marash
"Beamforming: A Versatile Approach to Spatial Filtering", Barry D. Van Veen and Kevin M. Buckley, ASSP Magazine, IEEE vol. 52, Apr. 1988, pp. 4-24.

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