Invention Grant
- Patent Title: Voice band expansion device, voice band expansion method, and communication apparatus
- Patent Title (中): 语音扩展装置，语音扩展方法以及通信装置
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Application No.: US12777398Application Date: 2010-05-11
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Publication No.: US08280727B2Publication Date: 2012-10-02
- Inventor: Kaori Endo , Takeshi Otani , Taro Togawa , Yasuji Ota
- Applicant: Kaori Endo , Takeshi Otani , Taro Togawa , Yasuji Ota
- Applicant Address: JP Kawasaki
- Assignee: Fujitsu Limited
- Current Assignee: Fujitsu Limited
- Current Assignee Address: JP Kawasaki
- Agency: Staas & Halsey LLP
- Priority: JP2009-139390 20090610
- Main IPC: G10L19/06
- IPC: G10L19/06 ; G10L21/00 ; G10L19/14 ; G10L19/00
Abstract:
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.
Public/Granted literature
- US20100318350A1 VOICE BAND EXPANSION DEVICE, VOICE BAND EXPANSION METHOD, AND COMMUNICATION APPARATUS Public/Granted day:2010-12-16
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