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Patent Searching and Data


Title:
COMPRESSION METHOD AND DEVICE, DECOMPRESSION METHOD AND DEVICE, COMPRESSION/DECOMPRESSION SYSTEM, RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2002/058244
Kind Code:
A1
Abstract:
Data to be compressed is differentiated for respective sampling points (S1-S20) and their absolute values are sequentially added to obtain differential total data (D1-D20). Then sampling points, where when data between two sampling points is subject to linear interpolation, an error between the interpolated data and the original data is up to a desired value, that is, points where even when data at each sampling point is reproduced only by decompression processing using linear interpolation, an error between the reproduced data and the original data is insignificant, are detected as sample points, and average differential value data between discrete sample points, timing data indicating time intervals between sample points, and polarity data of differential values at respective sampling points only are obtained as compression data, thereby improving the quality of data reproduced by decompressing with high compression ratio maintained.

Inventors:
KOYANAGI YUKIO (JP)
Application Number:
PCT/JP2002/000277
Publication Date:
July 25, 2002
Filing Date:
January 17, 2002
Export Citation:
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Assignee:
KOYANAGI YUKIO (JP)
SAKAI YASUE (JP)
International Classes:
H04N19/50; H03H17/06; H03M7/30; H04N19/59; H04N19/593; H04N19/80; H04N19/85; (IPC1-7): H03M7/30
Foreign References:
JPS5996513A1984-06-04
JPH03192400A1991-08-22
JP2001136073A2001-05-18
Other References:
See also references of EP 1365516A4
Attorney, Agent or Firm:
Tachibana, Kazuyuki (Oaza-Shimoshingashi Kawagoe-shi, Saitama, JP)
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