Browse Prior Art Database

Magnetic Domain Correlator

IP.com Disclosure Number: IPCOM000079358D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Liebschutz, LC: AUTHOR

Abstract

This apparatus provides high-speed, nonvolatile, low-cost, asynchronously operating correlation in which binary data is stored as columnar magnetic domains.

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Magnetic Domain Correlator

This apparatus provides high-speed, nonvolatile, low-cost, asynchronously operating correlation in which binary data is stored as columnar magnetic domains.

Generator 1 issues a new magnetic domain (bubble) for each planar magnetic field cycle by conventional field-access techniques. These domains are directed into a serial shift register 2 or to annihilator 3, according to whether data switch 4 is in position x or position y, respectively. When target sensor 5 detects data bit 6 (e.g., "E") in scan field 7, data control unit 8 actuates switch 4 to position x to feed the bit into register 2, which comprises conventional soft magnetic elements like T's and I's; whereas when no data bit is detected, switch 4 will be in position y to direct the domain from generator 1 to annihilator 3, and thereby create a gap in the data stream in register 2.

An incoming bit, E', may be correlated with its corresponding earlier entry, E, by interrogating the appropriate sensor 9. Information pertaining to positions adjacent to bit E' is available immediately, by comparing the entering bit with sensor outputs for positions A through D and F through 1. A correlation may be conducted for each planar field cycle.

It is thus essential that register 2 have enough bit positions to accommodate a field of data, plus a preselected number of additional bits to enable the comparison. Comparisons may be effected entirely in domain logic using bubble-to-bubble interact...