Nidec Sankyo Corporation

Yoichi Isono

Katsuhisa Higashi

Shigeo Nakajima

Shigeki Ozawa

An information reproduction device for use with a magnetic recording medium storing information may include an analog/digital (AD) converter structured to convert an analog signal, which is reproduced from the information recorded in the magnetic recording medium, into a digital signal; a peak detecting unit structured to detect a peak point of the reproduced signal, from the digital signal, according to a threshold as a judgment level in accordance with an output of the AD converter; and an information generating unit for generating structured to generate a rectangular waveform signal of the reproduced signal, waveform-shaped according to interval information of peak points detected by the peak detecting unit.

Information reproduction device and information reproduction method

A demodulation method of magnetic data may include a first data creating step which creates a preliminary data string for creating the demodulation data on a basis of an interval that is a time interval between peaks of a read signal of an analog-shaped magnetic data, and a second data creating step which creates a demodulation data creating data for creating the demodulation data on a basis of the preliminary data string created in the first data creating step. When a peak of the read signal is not detected for a predetermined time, a pseudo-peak is generated and a pseudo-interval is stored in a data storage section, and steps similar to the first data creating step and the second data creating step are executed, and the pseudo-peak is generated until the demodulation data creating data corresponding to a final interval is created.

Demodulation method of magnetic data and demodulation device of magnetic data

A data demodulation method may include converting an analog signal into a digital signal; detecting a peak point of a reproduced signal; creating a plurality of preliminary data rows for creating demodulated data; and creating demodulated data. The preliminary data rows may include the first individual data to be identified on the basis of the interval, and are formed of the first individual data of plural bits. Creating a plurality of preliminary data rows may use a template listing part of, or all of, a plurality of bit patterns being formed of second individual data.

Data demodulation device, data demodulation method, reproduction device for magnetically recorded data, and program

A method for demodulation where a plurality of preliminary data rows for creating the demodulated data are created according to intervals, each of which is a interval between peaks in a read signal coming from a magnetic head. Each preliminary data row includes first individual data identified according to the intervals, wherein a plurality of bits constitute the first individual data. At the time of creating the preliminary data row, standard intervals are identified for judging a first individual datum to be either '0' or '1', and the standard intervals are assigned in a template saved beforehand. Then, intervals for judgment are compared with the standard intervals assigned in the template, with respect to each bit of each bit patterns. A bit pattern in relation to the preliminary data row is identified according to the comparison result, in order to set the preliminary data row with the identified bit pattern.

Method and device for magnetic data demodulation

A reading method for data in a card reader including: (a) inserting a card provided with a magnetic stripe into a card insertion part, (b) reading data in the magnetic stripe with a data read section at least at a time of insertion or extraction of the card, (c) comparing an output level from the data read section with a predetermined read decision reference value, and then (d) changing the read decision reference value when the data have not been read. The read decision reference value may be changed from a low sensitivity setting to a high sensitivity setting or maybe circularly changed. The reading method for data is effectively utilized for a manual card reader.

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Nagano, Japan

Yoichi Isono