Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent
1993-10-05
1997-09-02
Isen, Forester W.
Electrical audio signal processing systems and devices
Directive circuits for microphones
379202, H04R 300
Patent
active
056640218
ABSTRACT:
A microphone system for use in an environment where an acoustic source emits energy from diverse and varying locations within the environment. The microphone system has at least two directional microphones, mixing circuitry, and control circuitry. The microphones are held each directed out from a center point. The mixing circuitry combines the electrical signals from the microphones in varying proportions to form a composite signal, the composite signal including contributions from at least two of the microphones. The control circuitry analyzes the electrical signals to determine an angular orientation of the acoustic signal relative to the central point, and substantially continuously adjusts the proportions in response to the determined orientation and provides the adjusted proportions to the mixing circuitry. The values of the proportions are selected so that the composite signal simulates a signal that would be generated by a single directional microphone pivoted about the central point to direct its maximum response at the acoustic signal as the acoustic signal moves about the environment.
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"Environ (Environmental Control Microphone) Model 2N1" (advertisement from Ingenuics, Inc., Jun. 1970.
Barton William F.
Chu Peter Lee
Isen Forester W.
PictureTel Corporation
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