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Readout From Magnetic Media

IP.com Disclosure Number: IPCOM000097902D
Original Publication Date: 1961-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Pingry, CO: AUTHOR

Abstract

Parallel readout from an asynchronously recorded magnetic media is obtained with the circuit. Media 1 has bits of information recorded on it at 2, 3 and 4 and these are spaced a predetermined, uniform distance apart. A synchronizing bit is recorded at 5 and is spaced one and one-half units from the nearest information bit 2. Magnetic heads 6, 7, 8 and 9 read the bits of information 5, 2, 3 and 4, respectively.

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Readout From Magnetic Media

Parallel readout from an asynchronously recorded magnetic media is obtained with the circuit. Media 1 has bits of information recorded on it at 2, 3 and 4 and these are spaced a predetermined, uniform distance apart. A synchronizing bit is recorded at 5 and is spaced one and one-half units from the nearest information bit 2. Magnetic heads 6, 7, 8 and 9 read the bits of information 5, 2, 3 and 4, respectively.

In only one position of media 1, relative to the heads, bit 5 and the bits 2, 3 and 4 are adjacent to the heads which read them. Thus, no spurious readings are obtained such as reading of an information bit by the synchronizing head and the simultaneous reading of information bits by the magnetic heads 7, 8 and 9.

The output of the synchronizing magnetic head 6 is ANDED with the output of each of the heads 7, 8 and 9. To accomplish this, diode pairs 10 and 11, 12 and 13, and 14 and 15, along with corresponding resistors 16, 17 and 18, are provided. Appropriate direct biasing potentials are provided to achieve the ANDING. The output terminals 19, 20 and 21 are applied to solid state thyratron or other circuits for triggering an appropriate output circuit.

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