| 摘要 |
<p>For classification of a mixed speech and noise signal (101) the signal is divided into separate, frequency limited subsignals (103), each of which contains at least two harmonic frequencies for the speech signal. The envelopes (105) of the subsignals (103) are formed as well as a measure (107) of synchronism between the envelopes (105). The synchronism measure (107) is compared with a threshold value for classification of the mixed signal as being significantly or insignificantly affected by the speech signal. The classification takes place with an unpresidented frequency and can therefore form the basis for a considerably more precise estimate of the noise signal than before, in particular when this has a speech-like nature.</p> |
