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Detector for Phase Encoded Binary Data

IP.com Disclosure Number: IPCOM000096404D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

McDonald, EG: AUTHOR

Abstract

Binary data magnetically recorded by the phase shift method can be recovered. This is by using the reproduced magnetic information to control the time of sampling the resulting electrical signal.

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Detector for Phase Encoded Binary Data

Binary data magnetically recorded by the phase shift method can be recovered. This is by using the reproduced magnetic information to control the time of sampling the resulting electrical signal.

When a phase encoded magnetic recording is transported past a transducer, an electrical signal can be obtained corresponding to the magnetic flux pattern in which the direction of change of the electrical signal corresponds to the direction of change of the flux polarity. Significant changes occur at regular intervals, the direction of change representing the binary data. Between like binary data, insignificant changes occur and between opposite binary data, no change takes place. A detecting circuit for phase encoded information must distinguish between significant and insignificant changes so that the output of the circuit only represents data.

This logic circuit receives an electrical information signal (Info) which corresponds to the magnetic flux pattern of the recorded information. Amplifier and shaper 2 produces wave forms A and B. Wave form A is a series of pulses corresponding to positive changes in the information signal. These positive pulses represent significant binary 1 changes and insignificant changes between binary 0's. Wave form B is a series of pulses corresponding to negative changes in the information signal representing significant binary 0 changes and insignificant changes between binary 1's. Wave forms A and B are complementary such that pulses representing binary 1 occur on A when the tape is transported i...