Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1976-07-06
1978-11-28
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
G11B 509
Patent
active
041278798
ABSTRACT:
A data read-write apparatus for a magnetic recording medium, wherein, when data represented by coded signals are written in a magnetic recording medium, a binary "1" signal of at least one bit is written in the magnetic recording medium ahead of data being written upon receipt of a clock pulse from a clock pulse oscillator; thereafter a series of binary coded signals denoting the content of the data are written in the magnetic recording medium; when the data are read out from the magnetic recording medium, the binary code "1" signal is first detected; upon said detection, the phase of clock pulses issued from the clock pulse oscillator are synchronized with the timing in which the binary coded "1" signal is read out; upon receipt of a phase-synchronized clock pulse, other binary coded signals stored in the magnetic recording medium in succession to the binary coded "1" signal are read out in synchronization with clock pulses sent forth from the clock pulse oscillator; and the clock pulse oscillator successively produces clock pulses for defining the intervals at which bits constituting data stored in the magnetic recording medium are read out or the intervals at which bits representing fresh data are written in the magnetic recording medium, thereby controlling the phases of the generated clock pulses.
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IBM TDB, vol. 2 #4, Dec. 1959, pp. 64-65 - "Self-syncing Clock for Binary Data" by Morphert, Jr.
Canney Vincent P.
Casio Computer Co. Ltd.
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