Magnetic data decoder

Details Magnetic data decoder Magnetic data decoder

1976-02-05

1977-03-15

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 43, G11B 502

Patent

active

040127869

ABSTRACT:
A data decoder is provided which is useful for decoding data magnetically encoded on a magnetic stripe on the back side of a credit card which may be manually moved through a reader at a variable velocity. The data is decoded by comparing the occurrence of voltage pulses after the onset of a bit interval, representing binary data encoded as magnetic flux changes, with a preselected portion of the measured time duration of the preceding bit interval. If a voltage pulse occurs after the onset but before the end of the preselected portion, the data is determined as a binary "one"; if a voltage pulse occurs after the end of the preselected portion, the data state is determined as a binary "zero".

REFERENCES:
patent: 3711843 (1973-01-01), Galvagni et al.
patent: 3736581 (1973-05-01), Breikss
patent: 3947662 (1976-03-01), Vinzl

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