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Magnetic card decoding method

A decoding method and magnetic card technology, applied in the field of magnetic card decoding, can solve the problems of abnormal output waveform, low flexibility, high hardware cost of amplification and shaping circuit or special magnetic card decoding chip, and solve the problem of high hardware cost, high flexibility, Effect of suppressing noise

Active Publication Date: 2012-10-10
FUJIAN LANDI COMML EQUIP CO LTD
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  • Abstract
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Problems solved by technology

[0004] Disadvantage 1: The hardware cost of the amplification and shaping circuit or the dedicated magnetic card decoding chip is relatively high
[0005] Disadvantage 2: The flexibility is low. The quality of the digital waveform output by the hardware depends on the design of the amplification and shaping circuit. When the hardware design is not good enough, the output waveform of some cards is not normal. Much smaller using the original waveform

Method used

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Embodiment Construction

[0053] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

[0054] see figure 1 , the present invention provides a magnetic card decoding method, comprising the following steps:

[0055] S1. Convert the sampled analog waveform into an initial digital waveform by using an extreme value method or a threshold method, and correct the pulse width of the initial digital waveform by using an interpolation method to obtain a corrected digital waveform;

[0056] S2, get the average pulse width of the pulse width of the leading bit 0 of the magnetic card, use this average pulse width as the initial reference pulse width, use the initial reference pulse width to discriminate the first pulse width of the corrected digital waveform, and by The initial reference pulse width obtains the second reference pulse wi...

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Abstract

The invention discloses a magnetic card decoding method. The method comprises the following steps of: S1, converting a sampled analog waveform into an initial digital waveform by adopting an extreme value method or a threshold method, and modifying the pulse width of the initial digital waveform by an interpolation method to obtain a modified digital waveform; S2, judging the first pulse width of the modified digital waveform by taking the average pulse width of the pulse widths with a leading bit of 0 of a magnetic card as an initial reference pulse width, obtaining a second reference pulse width by using the initial reference pulse width according to an exponentially weighted moving average (EWMA) formula, and judging the second pulse width of the modified digital waveform by taking the second reference pulse width as a reference, repeatedly executing the processes of adjusting the reference pulse width and judging the pulse width of the modified digital waveform according to the corresponding reference pulse width until all pulse widths of the modified digital waveform are judged; S3, converting the modified digital waveform into a bit sequence according to the judgment result of the S2; and S4, decoding the bit sequence.

Description

technical field [0001] The invention relates to the decoding field, in particular to a magnetic card decoding method. Background technique [0002] The traditional magnetic card soft decoding scheme is: on the hardware, the magnetic head is connected to the amplification and shaping circuit to obtain the digital signal, and then input to the processor; on the software, by recording the duration of each level of the input digital signal (ie Pulse width), realize soft decoding according to the relationship of pulse width. [0003] However, the above technology has the following disadvantages: [0004] Disadvantage 1: The hardware cost of the amplification and shaping circuit or the dedicated magnetic card decoding chip is relatively high. [0005] Disadvantage 2: The flexibility is low. The quality of the digital waveform output by the hardware depends on the design of the amplification and shaping circuit. When the hardware design is not good enough, the output waveform of ...

Claims

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Application Information

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IPC IPC(8): G06K7/00
Inventor 刘文灿
Owner FUJIAN LANDI COMML EQUIP CO LTD
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