发明名称 |
NACHFILTERUNG VON KODIERTER SPRACHE IM FREQUENZBEREICH |
摘要 |
<p>A method and system of performing postfiltering in the frequency domain to improve the quality of a speech signal, especially for synthesized speech resulting from codecs of low bit-rate, is provided. The method comprises LPC tilt computation and compensation methods and modules, a formant filter gain computation method and module, and an anti-aliasing method and module. The formant filter gain calculation employs an LPC representation, an all-pole modeling, a non-linear transformation and a phase computation: The LPC used for deriving the postfilter may be transmitted from an encoder or may be estimated from a synthesized or other speech signal in a decoder or receiver. The invention may be implemented in a linked decoder and encoder. A separate LPC evaluation unit that is responsible for processing and or deriving the LPC may be implemented within the invention. <IMAGE></p> |
申请公布号 |
AT355591(T) |
申请公布日期 |
2006.03.15 |
申请号 |
AT20020013983T |
申请日期 |
2002.06.25 |
申请人 |
MICROSOFT CORPORATION |
发明人 |
WANG, HONG;CUPERMAN, VLADIIR;GERSHO, ALLEN;KHALIL, HOSAM A. |
分类号 |
G10L19/02;G10L11/00;G10L19/14;G10L21/02;H03M7/30;(IPC1-7):G10L19/14 |
主分类号 |
G10L19/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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