Browse Prior Art Database

Azimuth Tester

IP.com Disclosure Number: IPCOM000114230D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 4 page(s) / 62K

Publishing Venue

IBM

Related People

Normura, Y: AUTHOR [+2]

Abstract

Disclosed is an Azimuth Tester which has a multi-track magnetic stripe read head to check an azimuth angle of a single-track encoding data on a magnetic stripe of a medium such as a credit card or a passbook using phase differences of read output from the multi-track read head. The symbol &alpha. of Fig. 1 shows an azimuth angle example of an encoding data.

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Azimuth Tester

      Disclosed is an Azimuth Tester which has a multi-track magnetic
stripe read head to check an azimuth angle of a single-track encoding
data on a magnetic stripe of a medium such as a credit card or a
passbook using phase differences of read output from the multi-track
read head.  The symbol &alpha.  of Fig. 1 shows an azimuth angle
example of an encoding data.

      Fig. 2 shows an example of this method.  This tester is
composed of the multi-track magnetic read head (HD1) and the head
moving mechanism such as lead screw and motor.

      Fig. 3 shows a circuit example of this method.  Fig. 4 shows
the wave form of this circuit.  The read signals ,which are outputs
from the read head (HD1) during the head scanning on the single-track
magnetic stripe of the test medium, are amplified by the operational
amplifiers (OA1) and (OA2).  The outputs of the (OA1) and (OA2) are
processed by the decoders (DC1, DC2) and the pattern detector (PD1,
PD2) respectively.  The pattern detector (PD1, PD2) indicate the
timing when the previously setting pattern, such as SOM (Start Of
Message) pattern, is detected in the output signals from the decoders
(DC1, DC2).  And Timer (TM1) counts the timing differences (hereafter
T1) of the pattern detection of the (PD1, PD2).

      This tester measures an accurate azimuth angle of the magnetic
stripe encoding device easily with simple mechanisms and circuits.