Title:
DEVICE AND METHOD FOR FREQUENCY INTERPOLATION AND RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP3538122
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a frequency interpolation device, etc., which restores a modulated wave obtained by using a band-limited signal of a source signal to a signal close to the source signal or restores an audio signal with high sound quality.
SOLUTION: An analyzer 1 converts a PCM signal into the spectrum of the PCM signal. A frequency interpolation processing part 2 specifies the combination having the highest correlation of a spectrum distribution among combinations of a reference band including the band of the highest frequency among bands obtained by equally dividing the spectrum into several and other bands when one is standardized. An interpolation band addition part 3 estimates the envelope of the PCM signal, scales the spectrum of the same distribution as the spectrum distribution in the reference band included in the combination specified by the frequency interpolation processing part 2 along the function of the envelope, and adds the result to a frequency side higher than the reference band. A synthesizer 4 generates a signal giving the spectrum after the interpolation band addition part 3 performs the addition.
Inventors:
Sato, Yasushi
Application Number:
JP2000178569A
Publication Date:
June 14, 2004
Filing Date:
June 14, 2000
Export Citation:
Assignee:
KENWOOD CORP
International Classes:
G01R23/16; G10L13/00; G10L19/00; G10L21/0388; H04R3/04; (IPC1-7): G10L13/00; G10L19/00; H04R3/04