| 摘要 |
<p>A method for reducing noise in a noisy time-varying speech input signal y includes receiving the input signal y and deriving a plurality of spectral component signals representing respective magnitudes |Y(k)| of spectral components of the input signal y. A correlation coefficient ηsn is obtained which indicates a correlation in the spectral domain between a clean speech signal component s and a noise signal component n present in the input signal y(y = s + n). Magnitudes of respective noise-suppressed spectral components Ŝ(k) are estimated by solving a correlation equation which gives a relationship between the magnitudes of the respective spectral components |Y(k)| of the noisy input signal y, the spectral components |S(k)| of the clean speech signal s, and the spectral components |N(k)| of the noise signal n, where the equation includes the correlation based on the obtained correlation coefficient ηsn. Preferably, the correlation equation is given by |Y(k)|a = |S(k)|a + |N(k)|a + η¿sn?|S(k)||N(k)|.</p> |
