Title:
DATA DEMODULATION METHOD
Document Type and Number:
Japanese Patent JP3681570
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a high-reliability data demodulation method by which the certainty of the result of bit conversion is obtained to clarify a countermeasure and erroneous reading in considerably reduced.
SOLUTION: A reproduced signal waveform is converted to a digital signal by analog/digital conversion, and the time interval between peaks of the digitized reproduced signal is measured, and individual inter-peak interval values constituting a one-character portion are compared with a reference value to convert the signal to a bit array consisting of binary data, thus demodulating data of the one-character portion. Further, ideal reproduced waveform of each character to e reproduced is preliminarily prepared as reference waveform data; and if inter-peak interval values are smaller or larger than the reference value, pattern matching between data of individual inter-peak intervals constituting the one-character portion and reference waveform data is performed, and a pertinent character is decided by the similarity.
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Inventors:
Hiroshi Nakamura
Mitsuo Yokozawa
Mitsuo Yokozawa
Application Number:
JP10506599A
Publication Date:
August 10, 2005
Filing Date:
April 13, 1999
Export Citation:
Assignee:
Sankyo Seiki Co., Ltd.
International Classes:
G11B5/09; G11B20/10; G11B20/14; (IPC1-7): G11B20/14; G11B5/09
Domestic Patent References:
| JP59203209A | ||||
| JP4348488A | ||||
| JP3534629B2 | ||||
| JP3571246B2 |
Attorney, Agent or Firm:
Yoshiyuki Ishibashi
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