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Information reproduction device and information reproduction method

A technology for information reproduction and location information, applied in recording/reproducing/deleting methods, information storage, recording information storage, etc. take the wrong effect

Inactive Publication Date: 2019-05-21
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the analog peak detection, in order to read a card with a lot of noise or a card with a low output and demagnetization, it is necessary to switch the circuit and read (Read), which has the disadvantages of increasing the circuit scale and increasing the cost.
In addition, since switching circuits are required, it is necessary to try various methods for reading, and the reading time becomes longer.

Method used

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  • Information reproduction device and information reproduction method
  • Information reproduction device and information reproduction method
  • Information reproduction device and information reproduction method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ＞

[0039] figure 1 This is a block diagram showing a configuration example of the information playback device according to the first embodiment of the present invention. figure 2 to show figure 1 A diagram of the signal processing waveform of the main part of the information reproduction device.

[0040] (Structure of the card reader)

[0041] In this embodiment, a card reader (hereinafter referred to as a "card reader") for reproducing information recorded on a magnetic card or the like as a recording medium will be described as an example of an information reproducing device. In this embodiment, a case where F and 2F signals corresponding to "0" and "1" signals magnetically recorded by a frequency modulation method are read and reproduced will be described as an example. However, the present technology is not limited to the F2F method, but various methods such as the F3F method, the NRZI method, and the MFM method are applicable.

[0042] Such as figure 1 As shown, the ca...

no. 2 approach

[0151] Figure 9 It is a block diagram showing a configuration example of an information playback device according to the second embodiment of the present invention.

[0152] An information reproduction device 10A according to the second embodiment is different from the information reproduction device (card reader) 10 according to the first embodiment in that a demodulation circuit is not provided in the digital reproduction processing circuit 14A. In the information reproducing apparatus 10A, the high-level apparatus 15A has a function of a demodulation circuit.

[0153] Other configurations are the same as those of the first embodiment, and according to the second embodiment, the same effects as those of the above-mentioned first embodiment can be obtained.

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PUM

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Abstract

A peak detection unit 142 in a card reader 10 provided in the invention is provided with: a determination unit 1421 which determines whether the current digital value from an AD converter 141 has changed from the previous digital value; a holding unit 1422 which is capable of holding position information, and a digital value from the AD converter 141 as an extreme value; and an update unit 1423 which, when the current digital value has changed from the previous digital value, updates the extreme value and the position information in the holding unit 1422, with the current digital value as theextreme value, and the position information, and, when the current digital value matches the previous digital value, holds, as the current extreme value position, an intermediate position between theposition of the current digital value and the position of the previous digital value, holds the matching digital value as the extreme value, and updates the position information with intermediate position information.

Description

technical field [0001] The present invention relates to an information reproducing device and an information reproducing method for reproducing record information recorded in a predetermined format (modulation method). Background technique [0002] For example, an information reproducing device (magnetic reproducing circuit) is suitable for a magnetic card reader and writer for reading F and 2F signals corresponding to "0" and "1" signals magnetically recorded in a frequency modulation manner, and mainly has the following structure . [0003] The information reproducing device reproduces the signal (magnetic information) recorded on the card through the magnetic head, and after amplifying the reproduced signal (analog waveform) through the amplifying circuit, the peak point is detected by the peak detection circuit, and the peak point is detected at the peak point. Invert the output signal and shape the waveform into a square wave signal. The square wave signal is a freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/09G11B20/10G11B20/14
CPCG06K7/084G11B20/10009G11B20/10268G11B20/14G11B20/1403G11B20/1419G11B2220/17G11B5/09H04L25/062G06K7/08
Inventor 中嶋茂雄东贺津久
Owner SANKYO SEIKI MFG CO LTD