Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1975-03-24
1978-12-12
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
G11B 509
Patent
active
041298888
ABSTRACT:
A first digital signal characterized by a plurality of data groups each including a particular number of digital data bits is encoded to provide a second encoded signal. A storage device is provided which includes a plurality of magnetizable surface areas each associated with one of the data groups and each including a plurality of cells corresponding in number to the number of data bits in one of the data groups. The cells are further divided into a plurality of flux change positions and the second encoded signal typically contains a data bit for each of the flux change positions in the plurality of cells. A recording head magnetizes the surface of the storage device in accordance with the digital characteristics of the second encoded signal. Each of the second encoded signals is provided with at least one digital "one" and, between adjacent digital "ones", at least one digital "zero" for each flux change position in a cell. These characteristics provide the flux pattern with flux changes which are spaced by a distance greater than the length of one cell. This increases the packing density of the storage device and facilitates self-clocking of the system.
REFERENCES:
patent: 3562726 (1971-02-01), Hamilton
patent: 3573766 (1971-04-01), Perkins, Jr.
patent: 3623041 (1971-11-01), MacDougall, Jr.
patent: 3750121 (1973-07-01), Lee
Canney Vincent P.
General Instrument Corporation
Roston Ellsworth R.
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