Microphone system
First Claim
1. A microphone system comprising:
- a plurality of microphone pairs, each pair having two microphones arranged apart from each other at a predetermined space at a crossing angle of 60 degrees or less;
a plurality of first calculating means for calculating a difference signal of outputs of each microphone pair;
a plurality of second calculating means for calculating a sum signal of outputs of each microphone pair;
means for detecting, as sound source direction information, a minimum value output from each output of the first calculating means; and
means for selecting a sum signal of the microphone pair corresponding to the minimum value output and outputting the selected sum signal as sound information.
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Accused Products
Abstract
Provided is a microphone system capable of detecting a direction of a sound source and extracting an object sound with a high S/N ratio. A microphone system comprises a plurality of microphone pairs 1 to 7, each pair having two microphones arranged apart from each other at a predetermined space at a crossing angle of 60 degrees or less, a plurality of subtraction circuits 11a for calculating a difference signal of outputs of each microphone pair, a plurality of addition circuits 11e for calculating a sum signal of outputs of each microphone pair, circuit sections 11c, 11d and 20 for detecting, as sound source direction information, a minimum value output from each output of the subtraction circuits 11a, and a switch 11f for selecting a sum signal of the microphone pairs 1 to 7 corresponding to the minimum value output and for outputting the selected sum signal as sound information.
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Citations
8 Claims
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1. A microphone system comprising:
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a plurality of microphone pairs, each pair having two microphones arranged apart from each other at a predetermined space at a crossing angle of 60 degrees or less; a plurality of first calculating means for calculating a difference signal of outputs of each microphone pair; a plurality of second calculating means for calculating a sum signal of outputs of each microphone pair; means for detecting, as sound source direction information, a minimum value output from each output of the first calculating means; and means for selecting a sum signal of the microphone pair corresponding to the minimum value output and outputting the selected sum signal as sound information. - View Dependent Claims (2, 3, 4, 7, 8)
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5. A microphone system comprising:
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a microphone array in which microphone sets are arranged at a crossing angle of 45 degrees or less, each microphone set including a first microphone pair having two microphones arranged apart from each other at a predetermined space and a second microphone pair orthogonal to the first microphone pair; a plurality of first calculating means for calculating a difference signal of outputs of each microphone pair; means for detecting, as a direction of a sound source, a minimum value output from each output of the first calculating means; second calculating means for calculating a ratio of output voltages of a microphone pair orthogonal to a microphone pair corresponding to the minimum value output; and means for calculating a distance from the microphone array to a sound source based on the ratio of the output voltages which is calculated by the second calculating means.
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6. A microphone system comprising a plurality of sound source direction discriminators including a plurality of microphone pairs, each pair having two microphones arranged apart from each other at a predetermined space at a crossing angle of 60 degrees or less, a plurality of calculating means for calculating a difference signal of outputs of each microphone pair, and means for detecting, as a direction of a sound source, a minimum value output from each output of the calculating means, wherein a crossing point of the directions of the sound source which are obtained by the sound source direction discriminators is calculated, thereby detecting a position of the sound source.
Specification