Method of transforming periodic signal using smoothed...

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G10L 11/00 (2006.01) G10L 21/04 (2006.01) G10L 21/00 (2006.01)

Patent

CA 2210826

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.

Dans un calcul de lissage en rapport avec un spectrogramme, une fonction d'interpolation triangulaire à largeur de fréquence double de la fréquence fondamentale d'un signal est obtenue à partir de l'information sur cette fréquence fondamentale. La fonction d'interpolation et un spectre obtenu dans une analyse fréquentielle adaptative sont soumises à une convolution fréquentielle. Ensuite, à l'aide d'une fonction d'interpolation triangulaire d'une durée égale au double de la période fondamentale, le spectre qui a subi l'interpolation fréquentielle ci-dessus est ensuite soumis à une interpolation temporelle pour produire un spectrogramme lissé dans lequel l'espace entre les points de quadrillage du plan temps-fréquence est rempli par la surface d'une fonction bilinéaire. Le spectrogramme lissé est utilisé pour transformer les sons vocaux. Par conséquent, l'effet de la périodicité dans les directions de la fréquence et du temps peut être réduit.

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