Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1980-01-17
1982-02-02
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
G11B 509
Patent
active
043142869
ABSTRACT:
An apparatus is provided for distinguishing a tribit servo track from other signals appearing on a rotating disk magnetic information storage media. The apparatus comprises circuit elements which detect for the concurrence of several characteristic features which differentiate the servo signal from data, inter-data-track beat-frequency signals, and noise, also picked up by the transducer head. Upon coincidence of all of the characteristic features tested for, along with an indication that the transducer head has been coarsely positioned over the servo track, a tri-bit-present signal is generated. Among the characteristic features tested for are proper timing of synchronization pulses, proper time relation between synchronization pulse and first positioning pulse, and the occurrence of two positioning pulses for every synchronization pulse.
REFERENCES:
patent: 3864741 (1975-02-01), Schwarz
patent: 3879752 (1975-04-01), Heidecker
patent: 4032984 (1977-06-01), Kaser et al.
patent: 4101942 (1978-07-01), Jacques
Burroughs Corporation
Califano Howard W.
Canney Vincent P.
Chung Edmund M.
Peterson Kevin R.
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