Variable-directivity microphone device
First Claim
1. A variable-directivity microphone device comprising:
- a microphone unit assembly of at least three microphone units, said three microphone units comprising first and second microphone units mutually spaced apart by specific distances and disposed with the front faces thereof facing the front face of said microphone unit assembly and a third microphone unit disposed with the front face thereof facing in the opposite direction relative to the direction of the front faces of said first and second microphone units;
directivity varying control means capable of undergoing displacement between at least three positions;
first mixing quantity varying means operating, while said control means is between a first position and a second position, to mix in accordance with the position thereof the output signal of the third microphone unit with the output signal of the first microphone unit with varied mixing quantity and, while said control means is between the second position and a third position, to cause the mixing quantity of the output signal of said third microphone unit to be zero; and
second mixing quantity varying means operating, while said control means is between said second position and said third position, to mix in accordance with the position thereof the output signal of the second microphone unit with the output signal of said first microphone unit with varied mixing quantity and, while said control means is between said first and second positions, to cause the mixing quantity of the output signal of said second microphone unit to be zero,the directivity of said microphone device obtained from the output signals of the first and third microphone units mixed through said first mixing quantity varying means in accordance with the displacement of said control means between the first and second positions being varied between a state of non-directivity and a primary sound-pressure gradient unidirectivity,the directivity of said microphone device obtained from the output signals of the first and second microphone units mixed through said second mixing quantity varying means in accordance with the displacement of said control means between the second and third positions being varied between the primary sound-pressure gradient unidirectivity and a multiple-order sound-pressure gradient unidirectivity.
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Abstract
A variable-directivity microphone device comprises at least three microphones. First and second microphones spaced apart by specific distances and facing in the same direction and a third microphone facing in the opposite direction. A directivity varying control capable of undergoing displacement between at least three positions, a first mixer operating, while the control is between a first and a second position, to mix, in accordance with the position thereof, the third microphone signal with the first microphone signal and, while the control is between the second and third positions, to cause the third microphone output signal to be zero, and a second mixer operating, while the control is between the second and third positions, to mix the first and second microphone output signals with varied mixing quantity and, while the control is between the first and second positions, to cause the output signal of the second microphone to be zero. The directivity obtained from the first and third microphone output signals mixed through the first mixer in accordance with the displacement of the control between the first and second positions being varied between a state of non-directivity and a primary sound-pressure gradient unidirectivity. The directivity obtained from the output signals of the first and second microphones mixed through the second mixer in accordance with the displacement of the control between the second and third positions being varied between a primary sound-pressure gradient unidirectivity and a multiple-order sound-pressure gradient unidirectivity.
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Citations
7 Claims
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1. A variable-directivity microphone device comprising:
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a microphone unit assembly of at least three microphone units, said three microphone units comprising first and second microphone units mutually spaced apart by specific distances and disposed with the front faces thereof facing the front face of said microphone unit assembly and a third microphone unit disposed with the front face thereof facing in the opposite direction relative to the direction of the front faces of said first and second microphone units; directivity varying control means capable of undergoing displacement between at least three positions; first mixing quantity varying means operating, while said control means is between a first position and a second position, to mix in accordance with the position thereof the output signal of the third microphone unit with the output signal of the first microphone unit with varied mixing quantity and, while said control means is between the second position and a third position, to cause the mixing quantity of the output signal of said third microphone unit to be zero; and second mixing quantity varying means operating, while said control means is between said second position and said third position, to mix in accordance with the position thereof the output signal of the second microphone unit with the output signal of said first microphone unit with varied mixing quantity and, while said control means is between said first and second positions, to cause the mixing quantity of the output signal of said second microphone unit to be zero, the directivity of said microphone device obtained from the output signals of the first and third microphone units mixed through said first mixing quantity varying means in accordance with the displacement of said control means between the first and second positions being varied between a state of non-directivity and a primary sound-pressure gradient unidirectivity, the directivity of said microphone device obtained from the output signals of the first and second microphone units mixed through said second mixing quantity varying means in accordance with the displacement of said control means between the second and third positions being varied between the primary sound-pressure gradient unidirectivity and a multiple-order sound-pressure gradient unidirectivity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification