Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent
1985-11-05
1987-03-24
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Directive circuits for microphones
381 94, 381 47, H04B 106, H04M 120
Patent
active
046531025
ABSTRACT:
The present invention relates to an improved directional microphone system which utilizes at least two directional microphones. The microphones included in the system are connected to an electrical circuit which is programmed to cancel static noise and to facilitate dynamic gain control. The received signals from the two microphones are fed into a microcomputer where a fast Fourier transformation is made on the two signals in order to go from the time domain to the frequency domain. A lowpass and highpass filtering technique is used to cancel the dynamic noise. The frequency components of the incoming signals are further used to utilize an area and phase sorting technique to allow only the pickup of the wanted sound in a well-defined area. An inverse fast Fourier transformation is made and the modified signal is outputted in the time domain. Sounds generated from outside the work area are essentially cancelled out by a combination of the directionality of the microphones and the sorting techniques employed. The sorting techniques actually measure extraneous noises within the work area and compensate for them so as to enhance the signal-to-noise ratio for sounds generated within the work area. The improved directional microphone system is to be used at the table or on the floor, at a convenient distance from the user who can move freely in a well defined work area. The system eliminates the use of gooseneck and headset microphones, which are commonly used to achieve a high enough signal-to-noise ratio.
REFERENCES:
patent: 3440350 (1969-04-01), Flanagan
patent: 3662108 (1972-05-01), Flanagan
patent: 4063031 (1977-12-01), Grunza
patent: 4485484 (1984-11-01), Flanagan
patent: 4536887 (1985-08-01), Kaneda
patent: 4559642 (1985-12-01), Miyaji
patent: 4589137 (1986-05-01), Miller
Position Orientation Systems
Rubinson Gene Z.
Schroeder L. C.
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