Apparatus, method, and program for sound quality correction based on identification of a speech signal and a music signal from an input audio signal
First Claim
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1. A sound quality correction apparatus comprising:
- a feature parameter calculator configured to calculate various feature parameters to identify a speech signal and a music signal from an input audio signal;
a speech/music identification score calculator configured to calculate a speech/music identification score indicating to which of the speech signal or the music signal the input audio signal is close to, based on the various feature parameters calculated by the feature parameter calculator;
a sound quality corrector configured to execute a plurality of sound quality correction processes of different types on the input audio signal; and
a controller configured to control a correction strength for each of the sound quality correction processes executed by the sound quality corrector, based on the speech/music identification score calculated by the speech/music identification score calculator, the controller being configured to determine a target correction strength for each of the sound quality correction processes executed by the sound quality corrector based on the speech/music identification score, and to change a present correction strength stepwise toward the target correction strength for each of the sound quality correction processes executed by the sound quality corrector, based on a forward transition time and a backward transition time which are predetermined for each of the sound quality correction processes executed by the sound quality corrector.
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Abstract
According to one embodiment, a sound quality correction apparatus calculates various feature parameters for identifying the speech signal and the music signal from an input audio signal and, based on the various feature parameters thus calculated, also calculates a speech/music identification score indicating to which of the speech signal and the music signal the input audio signal is close to. Then, based on this speech/music identification score, the correction strength of each of plural sound quality correctors is controlled to execute different types of the sound quality correction processes on the input audio signal.
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Citations
7 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 to identify a speech signal and a music signal from an input audio signal; a speech/music identification score calculator configured to calculate a speech/music identification score indicating to which of the speech signal or the music signal the input audio signal is close to, based on the various feature parameters calculated by the feature parameter calculator; a sound quality corrector configured to execute a plurality of sound quality correction processes of different types on the input audio signal; and a controller configured to control a correction strength for each of the sound quality correction processes executed by the sound quality corrector, based on the speech/music identification score calculated by the speech/music identification score calculator, the controller being configured to determine a target correction strength for each of the sound quality correction processes executed by the sound quality corrector based on the speech/music identification score, and to change a present correction strength stepwise toward the target correction strength for each of the sound quality correction processes executed by the sound quality corrector, based on a forward transition time and a backward transition time which are predetermined for each of the sound quality correction processes executed by the sound quality corrector. - View Dependent Claims (2, 3, 4, 5)
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6. A sound quality correction method comprising:
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calculating various feature parameters to identify a speech signal and a music signal from an input audio signal; calculating a speech/music identification score indicating to which of the speech signal or the music signal the input audio signal is close to, based on the calculated various feature parameters; executing a plurality of sound quality correction processes of different types on the input audio signal; controlling a correction strength for each of the sound quality correction processes executed by a sound quality corrector, based on the calculated speech/music identification score, the controlling comprising determining a target correction strength for each of the sound quality correction processes executed by the sound quality corrector based on the speech/music identification score, and changing a present correction strength stepwise toward the target correction strength for each of the sound quality correction processes executed by the sound quality corrector, based on a forward transition time and a backward transition time which are predetermined for each of the sound quality correction processes executed by the sound quality corrector.
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7. A non-transitory computer readable medium having stored thereon a sound quality correction program which is executable by a computer, the sound quality correction program controlling the computer to execute the functions of:
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calculating various feature parameters to identify a speech signal and a music signal from an input audio signal; calculating a speech/music identification score indicating to which of the speech signal or the music signal the input audio signal is close to, based on the various feature parameters calculated; and controlling a correction strength for each of the sound quality correction processes executed by a sound quality corrector, based on the calculated speech/music identification score, the controlling comprising determining a target correction strength for each of the sound quality correction processes executed by the sound quality corrector based on the speech/music identification score, and changing a present correction strength stepwise toward the target correction strength for each of the sound quality correction processes executed by the sound quality corrector, based on a forward transition time and a backward transition time which are predetermined for each of the sound quality correction processes executed by the sound quality corrector.
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Specification