Title:
INTERPOLATING FUNCTION GENERATING APPARATUS AND METHOD, DIGITAL-ANALOG CONVERTER, DATA INTERPOLATOR, PROGRAM, AND RECORD MEDIUM
Document Type and Number:
WIPO Patent Application WO/2002/071620
Kind Code:
A1
Abstract:
While a digital input is oversampled up to eight times to process and the oversample data into a specified digital fundamental waveform with multipliers/adders (4-10) to carry out only folding operation with delay circuits 11¿-1?-11¿-4? and the multipliers/adders (12-15) to allow the determination of a continuous interpolating value. Thus, it is sufficient to provide no low-pass filter which causes a deterioration in phase characteristics. A limited number of determined interpolating functions are determined to prevent a truncation error in interpolation. An AND gate (2) is used to determine a part of the oversample data as the input data, so that processing and folding operation of digital fundamental waveform is carried out in a very simple processing.
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Inventors:
KOYANAGI YUKIO (JP)
Application Number:
PCT/JP2002/001947
Publication Date:
September 12, 2002
Filing Date:
March 04, 2002
Export Citation:
Assignee:
KOYANAGI YUKIO (JP)
SAKAI YASUE (JP)
SAKAI YASUE (JP)
International Classes:
H03M1/66; G06F1/02; H03H17/00; H03H17/06; H03M1/00; H03M3/04; (IPC1-7): H03M3/02
Foreign References:
| JPH06244679A | 1994-09-02 | |||
| JPH1155076A | 1999-02-26 | |||
| JP2001069010A | 2001-03-16 |
Other References:
See also references of EP 1367721A4
Attorney, Agent or Firm:
Tachibana, Kazuyuki (Oaza-Shimoshingashi Kawagoe-shi, Saitama, JP)
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