发明名称 |
BANDWIDTH EXTENSION METHOD AND APPARATUS FOR A MODIFIED DISCRETE COSINE TRANSFORM AUDIO CODER |
摘要 |
A method includes defining a transition band for a signal having a spectrum within a first frequency band, where the transition band is defined as a portion of the first frequency band, and is located near an adjacent frequency band that is adjacent to the first frequency band. The method analyzes the transition band to obtain a transition band spectral envelope and a transition band excitation spectrum; estimates an adjacent frequency band spectral envelope; generates an adjacent frequency band excitation spectrum by periodic repetition of at least a part of the transition band excitation spectrum with a repetition period determined by a pitch frequency of the signal; and combines the adjacent frequency band spectral envelope and the adjacent frequency band excitation spectrum to obtain an adjacent frequency band signal spectrum. A signal processing logic for performing the method is also disclosed. |
申请公布号 |
WO2010091013(A1) |
申请公布日期 |
2010.08.12 |
申请号 |
WO2010US22879 |
申请日期 |
2010.02.02 |
申请人 |
MOTOROLA, INC.;RAMABADRAN, TENKASI;JASIUK, MARK |
发明人 |
RAMABADRAN, TENKASI;JASIUK, MARK |
分类号 |
G10L21/02;G10L19/06;G10L19/08 |
主分类号 |
G10L21/02 |
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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