发明名称 |
Method and system for speech enhancement in a noisy environment |
摘要 |
<p>There is described a method and system for enhancing speech in a noisy environment. The method operates on a frame-to-frame basis and preferably uses a Discrete Cosine Transform (DCT) to transform time-domain components of an input signal into frequency-domain components. The speech enhancement method is essentially based on a subspace approach in the so-called Bark-domain and an optimal subspace selection using a Minimum Description Length (MDL) criterion. The MDL-based subspace selection leads to a partition of the multi - dimensional space of noisy data into a noise subspace, a signal subspace and a signal-plus-noise subspace. The enhanced signal is reconstructed by applying the inverse transform to the components of the signal subspace and weighted components of the signal-plus-noise subspace, the noise subspace being nulled during this reconstruction. The resulting enhancement method provides maximum noise reduction while minimizing signal distortions such as the so-called musical residual noise encountered with conventional subtractive-type enhancement methods. <IMAGE></p> |
申请公布号 |
EP1253581(A1) |
申请公布日期 |
2002.10.30 |
申请号 |
EP20010201551 |
申请日期 |
2001.04.27 |
申请人 |
CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE S.A. |
发明人 |
VETTER, ROLF |
分类号 |
G10L21/0208;G10L21/0232;(IPC1-7):G10L21/02 |
主分类号 |
G10L21/0208 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|