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Title:
SYSTEM AND METHOD FOR SIGNAL INTERPOLATION
Document Type and Number:
WIPO Patent Application WO/2002/050814
Kind Code:
A1
Abstract:
A frequency interpolating system and an interpolation method for restoring a signal similar to an original signal from a band-limited signal obtained by limiting a specific frequency band of the original signal, or for restoring an audio signal with a high sound quality. A digital signal obtained by sample-quantizing an analog audio signal is inputted to a Fourier transform unit and transformed into a spectral signal of complex format. An interpolation band analyzing unit specifies an interpolated band to be interpolated and a reference band to be used for the interpolation, in the spectral signal. A signal interpolation processing unit estimates the envelope of the digital input signal, and extrapolates the spectrum having the same distribution as that in the reference band into the band to be interpolation, along the function of the envelope, to obtain the spectrum interpolated. The inverse Fourier transform unit generates a digital signal having the spectrum of the interpolated band, and an interpolation band adding unit adds the digital signal generated by the inverse Fourier transform unit and the digital signal delayed by a delay unit, to generate an output signal.

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Inventors:
SATO YASUSHI (JP)
Application Number:
PCT/JP2001/005264
Publication Date:
June 27, 2002
Filing Date:
June 20, 2001
Export Citation:
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Assignee:
KENWOOD CORP (JP)
KENWOOD GEOBIT CORP (JP)
SATO YASUSHI (JP)
International Classes:
G10L13/00; G10L21/0388; G10L25/00; G10L25/18; G11B20/18; (IPC1-7): G10L13/00; G10L19/00; H04B14/04; G11B20/10; G10L101/06
Foreign References:
JPH06301383A1994-10-28
JPH0990992A1997-04-04
JPH03254223A1991-11-13
JPH09258787A1997-10-03
JPH0651800A1994-02-25
JPH06222799A1994-08-12
JPH06294830A1994-10-21
JPH04249300A1992-09-04
JPH0685607A1994-03-25
JPH0793900A1995-04-07
Attorney, Agent or Firm:
Okabe, Masao (Fuji Bldg. 2-3 Marunouchi 3-chome Chiyoda-ku, Tokyo, JP)
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