Sound actuated microphone system
First Claim
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1. A sound system having an amplifying means responsive to a microphone signal for amplifying said signal, said system comprising:
- a microphone housing;
a microphone array secured within said housing and having a first microphone element with directional characteristics such that the relative sound sensitivity of said first element varies in accordance with the angle of incidence of sound relative to said element, and having at least a second microphone element secured in said housing in a fixed relationship to said first element, each of said microphone elements for receiving sound and each for generating a respective output signal, the ratio of the amplitudes (differences in decibels) of said output signals of said first and second elements being a function of the angle of incidence of the sound relative to said array;
logic circuit means for receiving each said respective output signals from at least said first and second microphone elements, said logic circuit responding to at least one said ratio to determine if the sound is incident from a particular area of space, said logic circuit means generating a gating signal solely when said sound is incident from said particular area of space; and
gate circuit means responsive to said gating signal for passing the said output signal of at least one microphone element of said array to said amplifying means for amplification.
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Abstract
A microphone channel is constructed from a pair of unidirectional microphone elements mounted back-to-back for monitoring sound coming from a predetermined area of space. The output signals of each microphone element are converted to D.C. logarithmic signals which are compared for gating an electrical output signal of a microphone element to the output/amplifying system.
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Citations
14 Claims
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1. A sound system having an amplifying means responsive to a microphone signal for amplifying said signal, said system comprising:
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a microphone housing; a microphone array secured within said housing and having a first microphone element with directional characteristics such that the relative sound sensitivity of said first element varies in accordance with the angle of incidence of sound relative to said element, and having at least a second microphone element secured in said housing in a fixed relationship to said first element, each of said microphone elements for receiving sound and each for generating a respective output signal, the ratio of the amplitudes (differences in decibels) of said output signals of said first and second elements being a function of the angle of incidence of the sound relative to said array; logic circuit means for receiving each said respective output signals from at least said first and second microphone elements, said logic circuit responding to at least one said ratio to determine if the sound is incident from a particular area of space, said logic circuit means generating a gating signal solely when said sound is incident from said particular area of space; and gate circuit means responsive to said gating signal for passing the said output signal of at least one microphone element of said array to said amplifying means for amplification. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification