Sound quality correction apparatus, sound quality correction method and program for sound quality correction
First Claim
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1. A sound quality correction apparatus comprising:
- a feature parameter calculator configured to calculate various feature parameters for distinguishing between a speech signal and a music signal and distinguishing between the music signal and a background sound signal, for an input audio signal;
a speech and music discrimination score calculator configured to calculate a speech and music discrimination score indicating which of the speech signal and the music signal the input audio signal is close to, based on the various feature parameters for distinguishing between the speech signal and the music signal calculated in the feature parameter calculator;
a music and background sound discrimination score calculator configured to calculate a music and background sound discrimination score indicating which of the music signal and the background sound signal the input audio signal is close to, based on the various feature parameters for distinguishing between the music signal and the background sound signal calculated in the feature parameter calculator;
a speech and music discrimination score corrector configured to correct the speech and music discrimination score based on a value of the music and background sound discrimination score when the speech and music discrimination score calculated in the speech and music discrimination score calculator indicates the music signal and when the music and background sound discrimination score calculated in the music and background sound discrimination score calculator indicates the background sound signal; and
a sound quality corrector configured to determine closeness to the speech signal or the music signal of the input audio signal based on the speech and music discrimination score corrected in the speech and music discrimination score corrector and perform a sound quality correction process for the speech or the music.
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Abstract
According to one embodiment, various feature parameters are calculated for distinguishing between a speech and music and between music and background sound for an input audio signal. With the feature parameters, score determination is made as to whether the input audio signal is close to a speech signal or a music signal. If the input audio signal is determined to be close to music, the preceding score determination result is corrected considering the influence of background sound. Based on the corrected score value, a sound quality correction process for a speech or music is applied to the input audio signal.
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Citations
8 Claims
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1. A sound quality correction apparatus comprising:
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a feature parameter calculator configured to calculate various feature parameters for distinguishing between a speech signal and a music signal and distinguishing between the music signal and a background sound signal, for an input audio signal; a speech and music discrimination score calculator configured to calculate a speech and music discrimination score indicating which of the speech signal and the music signal the input audio signal is close to, based on the various feature parameters for distinguishing between the speech signal and the music signal calculated in the feature parameter calculator; a music and background sound discrimination score calculator configured to calculate a music and background sound discrimination score indicating which of the music signal and the background sound signal the input audio signal is close to, based on the various feature parameters for distinguishing between the music signal and the background sound signal calculated in the feature parameter calculator; a speech and music discrimination score corrector configured to correct the speech and music discrimination score based on a value of the music and background sound discrimination score when the speech and music discrimination score calculated in the speech and music discrimination score calculator indicates the music signal and when the music and background sound discrimination score calculated in the music and background sound discrimination score calculator indicates the background sound signal; and a sound quality corrector configured to determine closeness to the speech signal or the music signal of the input audio signal based on the speech and music discrimination score corrected in the speech and music discrimination score corrector and perform a sound quality correction process for the speech or the music. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sound quality correction method of adaptively applying a sound quality correction process to a speech signal and a music signal included in an input audio signal by using a sound quality correction apparatus, the method comprising:
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calculating by a feature parameter calculation module included in the sound quality correction apparatus various feature parameters for distinguishing between the speech signal and the music signal and distinguishing between the music signal and a background sound signal, for the input audio signal; calculating by a speech and music discrimination score calculation module included in the sound quality correction apparatus a speech and music discrimination score indicating which of the speech signal and the music signal the input audio signal is close to, based on the various feature parameters for distinguishing between the speech signal and the music signal calculated by the feature parameter calculation module; calculating by a music and background sound discrimination score calculation module included in the sound quality correction apparatus a music and background sound discrimination score indicating which of the music signal and the background sound signal the input audio signal is close to, based on the various feature parameters for distinguishing between the music signal and the background sound signal calculated by the feature parameter calculation module; correcting by a speech and music discrimination score correction module included in the sound quality correction apparatus the speech and music discrimination score based on a value of the music and background sound discrimination score when the speech and music discrimination score calculated by the speech and music discrimination score calculation module indicates the music signal and when the music and background sound discrimination score calculated by the music and background sound discrimination score calculation module indicates the background sound signal; and determining by a sound quality correction module included in the sound quality correction apparatus closeness to the speech signal or the music signal of the input audio signal based on the speech and music discrimination score corrected by the speech and music discrimination score correction module and performing a sound quality correction process for a speech or music.
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8. A non-transitory computer readable medium having stored thereon a computer program which is executable by a computer, the computer program controls the computer to execute functions of:
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calculating various feature parameters for distinguishing between a speech signal and a music signal and distinguishing between the music signal and a background sound signal, for an input audio signal; calculating a speech and music discrimination score indicating which of the speech signal and the music signal the input audio signal is close to, based on the various feature parameters for distinguishing between the speech signal and the music signal; calculating a music and background sound discrimination score indicating which of the music signal and the background sound signal the input audio signal is close to, based on the various feature parameters for distinguishing between the music signal and the background sound signal; correcting the speech and music discrimination score based on a value of the music and background sound discrimination score when the speech and music discrimination score indicates the music signal and when the music and background sound discrimination score indicates the background sound signal; and determining closeness to the speech signal or the music signal of the input audio signal based on the corrected speech and music discrimination score and performing a sound quality correction process for a speech or music.
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Specification