Patent ID: 7864967

Claim:
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.