Sound pick-up device, program, and method
First Claim
Patent Images
1. A sound pick-up device comprising:
- a directionality forming unit that forms directionality in a target area direction from an input signal using a beam former;
a non-target area sound extraction unit that extracts non-target area sound present in the target area direction designated by the directionality formed by the directionality forming unit;
a target area sound extraction unit that outputs extracted sound, the extracted sound obtained by subtracting the non-target area sound present in the target area direction from output of the beam former;
a band dividing unit that divides each of the input signal and the extracted sound into a plurality of bands;
a power spectrum ratio computation unit that computes a power spectrum ratio between the input signal and the extracted sound for each divided band divided by the band dividing unit;
a determination unit that determines whether or not target area sound is present in the input signal by employing the power spectrum ratio for each divided band computed by the power spectrum ratio computation unit; and
an output unit that outputs the extracted sound as a sound pick-up result in cases in which the determination unit has determined target area sound to be present.
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Abstract
A sound pick-up device of the present disclosure acquires extracted sound as a result of extracting target area sound using non-target area sound present in a target area direction from output of a beam former, divides each of an input signal and the extracted sound into plural bands, computes a power spectrum ratio between the input signal and the extracted sound for each divided band, determines whether or not target area sound is present in the input signal by employing the power spectrum ratios for each divided band, and outputs the extracted sound as a sound pick-up result in cases in which target area sound has been determined to be present.
8 Citations
15 Claims
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1. A sound pick-up device comprising:
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a directionality forming unit that forms directionality in a target area direction from an input signal using a beam former; a non-target area sound extraction unit that extracts non-target area sound present in the target area direction designated by the directionality formed by the directionality forming unit; a target area sound extraction unit that outputs extracted sound, the extracted sound obtained by subtracting the non-target area sound present in the target area direction from output of the beam former; a band dividing unit that divides each of the input signal and the extracted sound into a plurality of bands; a power spectrum ratio computation unit that computes a power spectrum ratio between the input signal and the extracted sound for each divided band divided by the band dividing unit; a determination unit that determines whether or not target area sound is present in the input signal by employing the power spectrum ratio for each divided band computed by the power spectrum ratio computation unit; and an output unit that outputs the extracted sound as a sound pick-up result in cases in which the determination unit has determined target area sound to be present. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-transitory computer-readable recording medium storing a sound pick-up program that causes a computer to execute processing, the processing comprising:
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forming directionality in a target area direction from an input signal using a beam former; extracting non-target area sound present in the target area direction designated by the formed directionality; outputting extracted sound, the extracted sound obtained by subtracting the extracted non-target area sound present in the target area direction from output of the beam former; dividing each of the input signal and the extracted sound into a plurality of bands; computing a power spectrum ratio between the input signal and the extracted sound for each divided band; determining whether or not target area sound is present in the input signal by employing the power spectrum ratio computed for each divided band; and outputting the extracted sound as a sound pick-up result in cases in which target area sound has been determined to be present.
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8. A sound pick-up method comprising:
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forming directionality in a target area direction from an input signal using a beam former; extracting non-target area sound present in the target area direction designated by the formed directionality; outputting extracted sound, the extracted sound obtained by subtracting the extracted non-target area sound present in the target area direction from output of the beam former; dividing each of the input signal and the extracted sound into a plurality of bands; computing a power spectrum ratio between the input signal and the extracted sound for each divided band; determining whether or not target area sound is present in the input signal by employing the power spectrum ratio computed for each divided band; and outputting the extracted sound as a sound pick-up result in cases in which target area sound has been determined to be present.
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9. A sound pick-up device comprising:
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a directionality forming unit that forms directionality in a target area direction from an input signal using a beam former; a non-target area sound extraction unit that extracts non-target area sound present in the target area direction designated by the directionality formed by the directionality forming unit; a target area sound extraction unit that outputs extracted sound, the extracted sound obtained by subtracting the non-target area sound present in the target area direction from output of the beam former; a power spectrum ratio computation unit that computes a power spectrum ratio between the input signal and the extracted sound for each frequency component; a determination unit that determines whether or not target area sound is present in each frequency component by employing the power spectrum ratio computed by the power spectrum ratio computation unit; and an output unit that outputs a frequency component of the extracted sound for a frequency component in which the determination unit has determined target area sound to be present. - View Dependent Claims (10, 11, 12, 13)
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14. A non-transitory computer-readable recording medium storing a sound pick-up program that causes a computer to execute processing, the processing comprising:
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forming directionality in a target area direction from an input signal using a beam former; extracting non-target area sound present in the target area direction designated by the formed directionality; outputting extracted sound, the extracted sound obtained by subtracting the extracted non-target area sound present in the target area direction from output of the beam former; computing a power spectrum ratio between the input signal and the extracted sound for each frequency component; determining whether or not target area sound is present for each frequency component by employing the computed power spectrum ratios; and outputting a frequency component of the extracted sound for a frequency component in which target area sound has been determined to be present.
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15. A sound pick-up method comprising:
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forming directionality in a target area direction from an input signal using a beam former; extracting non-target area sound present in the target area direction designated by the formed directionality; outputting extracted sound, the extracted sound obtained by subtracting the extracted non-target area sound present in the target area direction from output of the beam former; computing a power spectrum ratio between the input signal and the extracted sound for each frequency component; determining whether or not target area sound is present for each frequency component by employing the computed power spectrum ratios; and outputting a frequency component of the extracted sound for a frequency component in which target area sound has been determined to be present.
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Specification