发明授权
- 专利标题： Voice band expansion device, voice band expansion method, and communication apparatus
- 专利标题（中）： 语音扩展装置，语音扩展方法以及通信装置
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申请号： US12777398申请日： 2010-05-11
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公开(公告)号： US08280727B2公开(公告)日： 2012-10-02
- 发明人: Kaori Endo , Takeshi Otani , Taro Togawa , Yasuji Ota
- 申请人： Kaori Endo , Takeshi Otani , Taro Togawa , Yasuji Ota
- 申请人地址： JP Kawasaki
- 专利权人： Fujitsu Limited
- 当前专利权人： Fujitsu Limited
- 当前专利权人地址： JP Kawasaki
- 代理机构： Staas & Halsey LLP
- 优先权： JP2009-139390 20090610
- 主分类号： G10L19/06
- IPC分类号： G10L19/06 ; G10L21/00 ; G10L19/14 ; G10L19/00
摘要：
A voice band expansion device includes a time-frequency converter that calculates a frequency spectrum of a voice signal having a first frequency band; a separator that extracts, from the frequency spectrum, an envelope amplitude spectrum, a periodic amplitude spectrum, and a random amplitude spectrum; an envelope amplitude spectrum band expander that expands a frequency band to a second frequency band that is different from the first frequency band; a periodic amplitude spectrum band expander that expands a frequency band to the second frequency band; a random amplitude spectrum band expander that expands a frequency band of the random amplitude spectrum to the second frequency band; a broadband spectrum calculator that calculates a broadband frequency spectrum having the first frequency band and the second frequency band; and a frequency-time converter generates a voice signal having the first frequency band and the second frequency band.