Invention Grant
US6115684A Method of transforming periodic signal using smoothed spectrogram,
method of transforming sound using phasing component and method of
analyzing signal using optimum interpolation function
失效
使用平滑光谱图变换周期信号的方法，使用相位分量变换声音的方法和使用最优内插函数分析信号的方法
- Patent Title: Method of transforming periodic signal using smoothed spectrogram, method of transforming sound using phasing component and method of analyzing signal using optimum interpolation function
- Patent Title (中): 使用平滑光谱图变换周期信号的方法，使用相位分量变换声音的方法和使用最优内插函数分析信号的方法
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Application No.: US902546Application Date: 1997-07-29
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Publication No.: US6115684APublication Date: 2000-09-05
- Inventor: Hideki Kawahara , Ikuyo Masuda
- Applicant: Hideki Kawahara , Ikuyo Masuda
- Applicant Address: JPX Kyoto
- Assignee: ATR Human Information Processing Research Laboratories
- Current Assignee: ATR Human Information Processing Research Laboratories
- Current Assignee Address: JPX Kyoto
- Priority: JPX8-200845 19960730; JPX8-344247 19961224
- Main IPC: G10L11/00
- IPC: G10L11/00 ; G10L21/00 ; G10L21/04 ; G10L101/02
Abstract:
At a smoothing spectrogram calculation portion, a triangular interpolation function having a frequency width twice that of the fundamental frequency of a signal is obtained based on information on the fundamental frequency of the signal. The interpolation function and a spectrum obtained at an adaptive frequency analysis portion are convoluted in the direction of frequency. Then, using a triangular interpolation function having a time length twice that of a fundamental period, the spectrum interpolated in the frequency direction described above is further interpolated in the temporal direction, in order to produce a smoothed spectrogram having the space between grid points on the time-frequency plane filled with the surface of a bilinear function. Using the smoothed spectrogram, a speech sound is transformed. Therefore, the influence of periodicity in the frequency direction and the temporal direction can be reduced.
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