SOUND SOURCE POSITION DETECTION DEVICE, SOUND SOURCE POSITION DETECTION METHOD, SOUND SOURCE POSITION DETECTION PROGRAM, AND RECORDING MEDIUM
First Claim
1. A sound source position detection device including:
- a pair of signal measurement units disposed separately from each other and each configured to measure a signal output from a sound source as a measured signal;
reference signal acquisition units each configured to acquire a reference signal;
a weighting processing unit configured to create weighted reference signals by weighting the reference signals measured by the respective reference signal acquisition units;
a time synchronization correction calculation unit configured to calculate a time synchronization correction value on the basis of the weighted reference signals, the time synchronization correction value being a correction value for synchronizing the two measured signals measured by respective ones of the pair of signal measurement units with each other;
an arrival time difference calculation unit configured to calculate an arrival time difference on the basis of the time synchronization correction value, the arrival time difference being a difference between elapsed times for the two measured signals measured by respective ones of the pair of signal measurement units to arrive at the respective ones of the pair of signal measurement units; and
a sound source position calculation unit configured to calculate a position of the sound source on the basis of the arrival time difference.
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Accused Products
Abstract
Signal measurement units each measure a signal output from a sound source, as a measured signal. Reference signal acquisition units each acquire a reference signal. A weighting processing unit creates weighted reference signals by weighting the reference signals. A time synchronization correction calculation unit calculates a time synchronization correction value based on the weighted reference signals. The time synchronization correction value is a correction value for synchronizing the two measured signals. An arrival time difference calculation unit calculates an arrival time difference based on the time synchronization correction value. The arrival time difference is a difference between elapsed times for the two measured signals acquired by respective ones of the pair of signal measurement units to arrive at the respective ones of the pair of signal measurement units. A sound source position calculation unit calculates a position of the sound source based on the arrival time difference.
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Citations
9 Claims
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1. A sound source position detection device including:
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a pair of signal measurement units disposed separately from each other and each configured to measure a signal output from a sound source as a measured signal; reference signal acquisition units each configured to acquire a reference signal; a weighting processing unit configured to create weighted reference signals by weighting the reference signals measured by the respective reference signal acquisition units; a time synchronization correction calculation unit configured to calculate a time synchronization correction value on the basis of the weighted reference signals, the time synchronization correction value being a correction value for synchronizing the two measured signals measured by respective ones of the pair of signal measurement units with each other; an arrival time difference calculation unit configured to calculate an arrival time difference on the basis of the time synchronization correction value, the arrival time difference being a difference between elapsed times for the two measured signals measured by respective ones of the pair of signal measurement units to arrive at the respective ones of the pair of signal measurement units; and a sound source position calculation unit configured to calculate a position of the sound source on the basis of the arrival time difference. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A sound source position detection method comprising:
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measuring a signal output from a sound source by a pair of signal measurement units disposed separately from each other, as measured signals; acquiring reference signals; creating weighted reference signals by weighting the reference signals; calculating a time synchronization correction value on the basis of the weighted reference signals, the time synchronization correction value being a correction value for synchronizing the two measured signals measured by respective ones of the pair of signal measurement units with each other; calculating an arrival time difference on the basis of the time synchronization correction value, the arrival time difference being a difference between elapsed times for the two measured signals measured by respective ones of the pair of signal measurement units to arrive at the respective ones of the pair of signal measurement units; and calculating a position of the sound source on the basis of the arrival time difference.
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9. A recording medium storing a sound source position detection program for causing a computer to execute a process comprising:
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measuring a signal output from a sound source by a pair of signal measurement units disposed separately from each other, as measured signals; acquiring reference signals; creating weighted reference signals by weighting the reference signals; calculating a time synchronization correction value on the basis of the weighted reference signals, the time synchronization correction value being a correction value for synchronizing the two measured signals measured by respective ones of the pair of signal measurement units with each other; calculating an arrival time difference on the basis of the time synchronization correction value, the arrival time difference being a difference between elapsed times for the two measured signals measured by respective ones of the pair of signal measurement units to arrive at the respective ones of the pair of signal measurement units; and calculating a position of the sound source on the basis of the arrival time difference.
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Specification