Image-derived second-order directional microphones with finite baffle
First Claim
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1. An acoustic transducer comprising:
- an acoustical reflecting surface of a finite dimension, said finite dimension being approximately one to one-half of an acoustic wavelength at a predetermined frequency; and
at least one sensor having an output which produces a first-order differential response pattern, said at least one sensor being located proximate to said reflecting surface, wherein acoustical waves propagating from said reflecting surface, acoustically interact with said at least one sensor to produce a second-order differential response at said output of said at least one sensor at said predetermined frequency and at low frequencies relative to said predetermined frequency a first-order response at said output occurs.
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Abstract
An acoustic transducer including an acoustical reflecting surface of a finite dimension and at least one sensor having an output which produces a first-order differential response pattern. The sensor is located proximate to the reflecting surface, wherein acoustical waves propagating from the reflecting surface, acoustically interact with the sensor to produce a second-order differential response pattern at the output of the sensor at a predetermined frequency. The second-order differential response pattern at the output of the sensor occurs at the predetermined frequency when the finite dimension of the reflecting surface is at least one-half of an acoustic wavelength.
37 Citations
22 Claims
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1. An acoustic transducer comprising:
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an acoustical reflecting surface of a finite dimension, said finite dimension being approximately one to one-half of an acoustic wavelength at a predetermined frequency; and at least one sensor having an output which produces a first-order differential response pattern, said at least one sensor being located proximate to said reflecting surface, wherein acoustical waves propagating from said reflecting surface, acoustically interact with said at least one sensor to produce a second-order differential response at said output of said at least one sensor at said predetermined frequency and at low frequencies relative to said predetermined frequency a first-order response at said output occurs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A second-order differential image-derived microphone comprising:
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a baffle having an acoustical reflecting surface of a finite dimension; and at least one microphone having an output which produces a first-order differential response pattern, said at least one microphone being located proximate to said reflecting surface of said baffle, wherein acoustical waves propagating from said reflecting surface, acoustically interact with said at least one microphone to produce a second-order differential response pattern at said output at a frequency where said finite dimension of said reflecting surface is approximately one to one-half of an acoustical wavelength. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification