Apparatus and method of detecting target sound
First Claim
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1. An apparatus configured to detect a target sound based on each sound signal acquired by a plurality of acoustic sensors, comprising:
- a frequency converter configured to convert the sound signal into a frequency input signal;
a phase difference calculator configured to calculate a phase difference corresponding to each frequency component using the frequency input signal;
a characteristic value extractor configured to extract a characteristic value indicating a possibility that the phase difference corresponding to the frequency component is within an allowable phase difference range of target sound determined based on a direction angle of the target sound; and
a determining unit configured to compare the characteristic value to a threshold characteristic value, so as to determine whether the target sound exists in the sound signal according to the result of the comparison.
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Abstract
An apparatus and method of voice activity detection (VAD) are disclosed. To detect a target sound, a target sound detecting apparatus calculates the phase difference corresponding to each frequency component from a plurality of sound signals converted in frequency domain, calculates a characteristic value indicating possibility that the phase difference of the frequency component is within an allowable phase difference range of target sound calculated based on a direction angle of the target sound, and detects the presence and/or absence of target sound using the characteristic value.
22 Citations
19 Claims
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1. An apparatus configured to detect a target sound based on each sound signal acquired by a plurality of acoustic sensors, comprising:
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a frequency converter configured to convert the sound signal into a frequency input signal; a phase difference calculator configured to calculate a phase difference corresponding to each frequency component using the frequency input signal; a characteristic value extractor configured to extract a characteristic value indicating a possibility that the phase difference corresponding to the frequency component is within an allowable phase difference range of target sound determined based on a direction angle of the target sound; and a determining unit configured to compare the characteristic value to a threshold characteristic value, so as to determine whether the target sound exists in the sound signal according to the result of the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of detecting target sound based on each sound signal acquired by a plurality of acoustic sensors, the method comprising:
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converting the sound signal into an frequency input signal; calculating a phase difference corresponding to each frequency component of the frequency input signal; obtaining an allowable phase difference range of target sound, based on a direction angle of the target sound and an allowable angle range of the target sound including the direction angle of the target sound; extracting a characteristic value indicating a possibility that the phase difference corresponding to the frequency component is within an allowable phase difference range of the target sound; and comparing the characteristic value to a threshold characteristic value, so as to determine whether the target sound exists in the sound signal according to the result of the comparison. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A non-transitory computer-readable storage medium configured to store a program to detect a target sound, comprising instructions to cause a computer to:
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convert the sound signal into a frequency input signal; calculate a phase difference corresponding to each frequency component of the frequency input signal; obtain an allowable phase difference range of target sound, based on a direction angle of the target sound and an allowable angle range of the target sound including the direction angle of the target sound; extract a characteristic value indicating a possibility that the phase difference corresponding to the frequency component is within an allowable phase difference range of the target sound; and compare the characteristic value to a threshold characteristic value, so as to determine whether the target sound exists in the sound signal according to the result of the comparison. - View Dependent Claims (19)
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Specification