Method and apparatus for separating sound-source signal and method and device for detecting pitch
First Claim
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1. A sound-source signal separating apparatus, comprising:
- a sound-source signal enhancing unit operable to enhance a target sound-source signal in an input audio signal to produce an enhanced sound-source signal, the input audio signal including a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup devices;
a pitch detector operable to detect a pitch of the target sound-source signal in the input audio signal; and
a sound-source signal separating unit operable to separate the target sound-source signal from the input audio signal based on the detected pitch and the enhanced sound-source signal.
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Abstract
In a sound-source signal separating method, a target sound-source signal in an input audio signal is enhanced, the input audio signal being from a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup devices. The pitch of the target sound-source signal in the input audio signal is detected, and the target sound-source signal is separated from the input audio signal based on the detected pitch and the enhanced sound-source signal.
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Citations
21 Claims
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1. A sound-source signal separating apparatus, comprising:
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a sound-source signal enhancing unit operable to enhance a target sound-source signal in an input audio signal to produce an enhanced sound-source signal, the input audio signal including a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup devices;
a pitch detector operable to detect a pitch of the target sound-source signal in the input audio signal; and
a sound-source signal separating unit operable to separate the target sound-source signal from the input audio signal based on the detected pitch and the enhanced sound-source signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A sound-source signal separating method, comprising:
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enhancing a target sound-source signal in an input audio signal to produce an enhanced sound-source signal, the input audio signal including a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup devices;
detecting a pitch of the target sound-source signal in the input audio signal; and
separating the target sound-source signal from the input audio signal based on the detected pitch and the enhanced sound-source signal.
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15. A sound-source signal separating apparatus, comprising:
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sound-source signal enhancing means for enhancing a target sound-source signal in an input audio signal to produce an enhanced sound-source signal, the input audio signal including a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup units;
pitch detector means for detecting a pitch of the target sound-source signal in the input audio signal; and
sound-source signal separating means for separating the target sound-source signal from the input audio signal based on the detected pitch and the enhanced sound-source signal.
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16. A pitch detector, comprising:
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a sound-source signal enhancing unit operable to enhance a target sound-source signal in an input audio signal to produce an enhanced sound-source signal, the input audio signal including a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup devices;
a period detector operable to detect a two-wavelength period of a signal output from the sound-source signal enhancing unit using two wavelengths of a pitch of the output signal as a unit of detection; and
a continuity determining unit operable to determine, in response to a change in the two-wavelength period detected by the period detector, whether at least about the same pitch has been consecutively repeated, and to output pitch information as the result of the determination. - View Dependent Claims (17, 18)
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19. A pitch detecting method, comprising:
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enhancing a target sound-source signal in an input audio signal to produce an enhanced sound-source signal, the input audio signal including a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup devices;
detecting a two-wavelength period of a signal output from the sound-source signal enhancing step using two wavelengths of a pitch of the output signal as a unit of detection; and
determining, in response to a change in the two-wavelength period detected in the period detecting step, whether at least about the same pitch has been consecutively repeated, and outputting pitch information as the result of the determination.
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20. A sound-source signal separating apparatus, comprising:
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a pitch detector operable to detect a pitch of a target sound-source signal of an input audio signal using a wavelength twice the pitch of the target sound-source signal as a unit of detection, the input audio signal including a mixture of acoustic signals from a plurality of sound sources; and
a sound-source signal separating unit operable to separate the target sound-source signal based on the detected pitch.
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21. A sound-source signal separating method, comprising:
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detecting a pitch of a target sound-source signal of an input audio signal using a wavelength twice the pitch of the target sound-source signal as a unit of detection, the input audio signal including a mixture of acoustic signals from a plurality of sound sources; and
separating the target sound-source signal based on the detected pitch.
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Specification