Magnetic recording medium reading method, reading device, and storage medium
A technology of magnetic recording medium and reading device, which is applied in recording information storage, configuration/installation of recording head, magnetic recording, etc., can solve problems such as data recovery, and achieve the effect of reliable reading and simple circuit structure
Active Publication Date: 2020-05-19
SANKYO SEIKI MFG CO LTD
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, when there is damage in the magnetic stripe, the magnetic force on the magnetic stripe is reduced, or the data recording on the magnetic stripe is incomplete, hump-shaped noise is superimposed on the signal output from the magnetic head, and the differential circuit misrepresents the noise. ground recognition as a regular polarity reversal, as a result, sometimes erroneous data will be restored
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0031] Next, embodiments of the present invention will be described with reference to the drawings. figure 1 The configuration of the reading device according to one embodiment of the present invention is shown. The illustrated reading device is a device for reading recorded data from a magnetic card 10 as a magnetic recording medium, and includes a motor 11 for transporting the magnetic card 10, and relatively slides with respect to a magnetic stripe (not shown) of the magnetic card 10 transported by the motor 11. The magnetic head 12 and the reading circuit 21 for recovering the recorded data according to the magnetic reproduction waveform obtained by the magnetic head 12.
[0032] The reading circuit 21 is a commonly used circuit having a differentiating circuit 24, and is equipped with a band pass filter (Band pass filter) 22 for extracting a desired frequency component from the magnetic reproduction waveform from the magnetic head 12 and amplifying and passing the band pa...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present invention provides a magnetic recording medium reading method, reading device, and program capable of reliably reading data from a magnetic recording medium with reduced magnetic force without being affected by noise, with a simple circuit configuration. This reading method uses a differential circuit to generate a digital signal that takes either of two values in accordance with an increase or decrease in a magnetic reproduction waveform, and restores recording data based on the digital signal, wherein the following processing is performed: estimation processing, which converts the digital signal into The switching interval between the two values of the current interval is used as the interval interval, and at least the bit corresponding to the current interval interval is estimated by comparing the length of the current interval interval with the first threshold value; The second threshold value is compared, and when the length of the subsequent interval interval is lower than the second threshold value, it is determined that the subsequent interval interval is noise; the noise elimination processing is performed to eliminate the noise when it is determined to be noise.
Description
technical field [0001] The present invention relates to a reading method, a reading device, and a program for reading data from a magnetic recording medium such as a magnetic card. Background technique [0002] In a magnetic recording medium such as a magnetic card, a bit string composed of binary bits of "0" and "1" is recorded using the direction of magnetization in the magnetic stripe. As a recording method of bit string data in a magnetic stripe, FM modulation schemes are known, and one of them is F2F modulation scheme. In the F2F modulation method, an area in which 1 bit of data is recorded on the magnetic stripe is used as a bit unit, and recording is performed so that the following conditions are satisfied: (a) The direction of magnetization is reversed at the boundary of adjacent bit units ; (b) The direction of magnetization is not reversed inside the bit cell corresponding to "0" (that is, the F signal); (c) Regarding the bit cell corresponding to "1", the magneti...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/60
CPCG11B5/6029
Inventor 宫泽启志
Owner SANKYO SEIKI MFG CO LTD