发明申请
- 专利标题： SPECTRAL SMOOTHING DEVICE, ENCODING DEVICE, DECODING DEVICE, COMMUNICATION TERMINAL DEVICE, BASE STATION DEVICE, AND SPECTRAL SMOOTHING METHOD
- 专利标题（中）： 光谱平滑装置，编码装置，解码装置，通信终端装置，基站装置和光谱平滑方法
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申请号： US13057454申请日： 2009-08-07
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公开(公告)号： US20110137643A1公开(公告)日： 2011-06-09
- 发明人: Tomofumi Yamanashi , Masahiro Oshikiri , Toshiyuki Morii , Hiroyuki Ehara
- 申请人： Tomofumi Yamanashi , Masahiro Oshikiri , Toshiyuki Morii , Hiroyuki Ehara
- 优先权： JP2008-205645 20080808; JP2009-096222 20090410
- 国际申请： PCT/JP2009/003799 WO 20090807
- 主分类号： G10L19/02
- IPC分类号： G10L19/02
摘要：
Disclosed is a spectral smoothing device with a structure whereby smoothing is performed after a nonlinear conversion has been performed for a spectrum calculated from an audio signal, and with which the amount of processing calculation is significantly reduced while maintaining excellent audio quality. With this spectral smoothing device, a sub band division unit (102) divides an input spectrum into multiple sub bands; a representative value calculation unit (103) calculates a representative value for each sub band using an arithmetic mean and a geometric mean; with respect to each representative value, a nonlinear conversion unit (104) performs a nonlinear conversion the characteristic of which is further emphasized as the value increases; and a smoothing unit (105) that smoothes the representative value which has undergone the nonlinear conversion for each sub band, at the frequency domain.