Title:
LINEAR PREDICTIVE COEFFICIENT CONVERTING DEVICE AND LINEAR PREDICTIVE COEFFICIENT CONVERTING METHOD
Document Type and Number:
Japanese Patent JP2020144397
Kind Code:
A
Abstract:
To use a small calculation amount to estimate a linear-predictive synthesis filter with an internal sampling frequency converted.SOLUTION: A linear predictive coefficient converting device converts a first linear predictive coefficient calculated from a first sampling frequency into a second linear predictive coefficient of a second sampling frequency different from the first sampling frequency, and comprises: means of calculating a power spectrum corresponding to the second linear predictive coefficient in the second sampling frequency on a real axis of a unit circle, on the basis of the first linear predictive coefficient or its equivalent parameter; means of calculating an autocorrelation coefficient from the power spectrum on the real axis of the unit circle; and means of converting the autocorrelation coefficient into the second linear predictive coefficient of the second sampling frequency.SELECTED DRAWING: Figure 5
Inventors:
NAKA NOBUHIKO
VESA RUOPPILA
VESA RUOPPILA
Application Number:
JP2020099191A
Publication Date:
September 10, 2020
Filing Date:
June 08, 2020
Export Citation:
Assignee:
NTT DOCOMO INC
International Classes:
G10L19/06; G10L25/12
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Takashi Okiyama
Kenji Fukaishi
Yoshiki Kuroki
Takashi Okiyama
Kenji Fukaishi