| 摘要 |
A speech communication or computing device comprises at least one speech input device for receiving noisy speech uttered by a speaker. A speech processing function comprises a voice recognition function, which comprises a noise reduction function ( 235 ) having a Wiener Filter ( 335 ) with adjustable filter co-efficients. The speech input device also comprises multiple microphones ( 142, 144 ) configured to provide a substantially continuous noise signal to a noise spectrum estimation function ( 325 ) of the noise reduction function ( 235 ) to provide a substantially continuous estimate of noise. The noise estimate is used to adjust the filter co-efficients of the Wiener Filter ( 335 ), thereby removing noise from the noisy speech. A microphone array and a method for speech recognition are also described. By using the noise estimate from, say, a microphone array, the Wiener filter coefficients can be updated substantially continuously, for example, each speech frame. This enables the noise to be tracked more closely than in known techniques. As the noise within a speech signal is tracked more closely, it can therefore be removed more effectively. |
