DEREVERBERATION APPARATUS, DEREVERBERATION METHOD, DEREVERBERATION PROGRAM, AND RECORDING MEDIUM
First Claim
1. A dereverberation apparatus that removes a reverberation signal from an observation signal by applying a dereverberation filter to the observation signal, the observation signal being obtained by collecting an audio signal emitted from a sound source, comprising:
- a sound source model storage section that stores a sound source model that represents the audio signal in the form of a probability density function;
a dividing section that divides the observation signal into a plurality of frequency-specific observation signals each corresponding to one of a plurality of frequency bands;
an estimating section that determines a dereverberation filter for a corresponding frequency band by using the frequency-specific observation signal for the corresponding frequency band on the basis of the sound source model and a reverberation model that represents a relationship among the audio signal, the observation signal and the dereverberation filter for the corresponding frequency band;
a removing section that determines a frequency-specific target signal for a corresponding frequency band by applying the dereverberation filter for the corresponding frequency band determined by the estimating section to the frequency-specific observation signal for the corresponding frequency band; and
an integrating section that integrates the frequency-specific target signals.
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Abstract
A sound source model storage section stores a sound source model that represents an audio signal emitted from a sound source in the form of a probability density function. An observation signal, which is obtained by collecting the audio signal, is converted into a plurality of frequency-specific observation signals each corresponding to one of a plurality of frequency bands. Then, a dereverberation filter corresponding to each frequency band is estimated by using the frequency-specific observation signal for the frequency band on the basis of the sound source model and a reverberation model that represents a relationship for each frequency band among the audio signal, the observation signal and the dereverberation filter. A frequency-specific target signal corresponding to each frequency band is determined by applying the dereverberation filter for the frequency band to the frequency-specific observation signal for the frequency band, and the resulting frequency-specific target signals are integrated.
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Citations
10 Claims
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1. A dereverberation apparatus that removes a reverberation signal from an observation signal by applying a dereverberation filter to the observation signal, the observation signal being obtained by collecting an audio signal emitted from a sound source, comprising:
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a sound source model storage section that stores a sound source model that represents the audio signal in the form of a probability density function; a dividing section that divides the observation signal into a plurality of frequency-specific observation signals each corresponding to one of a plurality of frequency bands; an estimating section that determines a dereverberation filter for a corresponding frequency band by using the frequency-specific observation signal for the corresponding frequency band on the basis of the sound source model and a reverberation model that represents a relationship among the audio signal, the observation signal and the dereverberation filter for the corresponding frequency band; a removing section that determines a frequency-specific target signal for a corresponding frequency band by applying the dereverberation filter for the corresponding frequency band determined by the estimating section to the frequency-specific observation signal for the corresponding frequency band; and an integrating section that integrates the frequency-specific target signals. - View Dependent Claims (2, 3, 4, 10)
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5. A dereverberation method that removes a reverberation signal from an observation signal by applying a dereverberation filter to the observation signal, the observation signal being obtained by collecting an audio signal emitted from a sound source,
wherein a sound source model storage section stores a sound source model that represents the audio signal in the form of a probability density function, and the dereverberation method comprises: -
a dividing step of dividing the observation signal into a plurality of frequency-specific observation signals each corresponding to one of a plurality of frequency bands; an estimating step of determining dereverberation filters each corresponding to one of the plurality of frequency bands by using the frequency-specific observation signal for the one of the plurality of frequency bands on the basis of the sound source model and a reverberation model that represents a relationship among the audio signal, the observation signal and the dereverberation filter for each of the plurality of frequency bands; a removing step of determining frequency-specific target signals each corresponding to one of the plurality of frequency bands by applying the dereverberation filter for the one of the plurality of frequency bands determined in the estimating step to the frequency-specific observation signal for the one of the plurality of frequency bands; and an integrating step of integrating the frequency-specific target signals. - View Dependent Claims (6, 7, 8)
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9. (canceled)
Specification