Data modulation and demodulation system for magnetic recording s

Details Data modulation and demodulation system for magnetic recording s Data modulation and demodulation system for magnetic recording s

1987-12-08

1989-09-12

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 51, G11B 509

Patent

active

048665444

ABSTRACT:
A system for modulating and demodulating write data and read data in a magnetic recording system in accordance with a (1,7) RLL method. The modulating and demodulating system includes a first clock pulse generating circuit receiving a reference signal from a recording medium and generating a first clock pulse having a first frequency equal to a data write frequency in accordance with a phase of the reference signal; a second clock pulse generating circuit receiving the first clock pulse and generating a second clock pulse having a second frequency, the second frequency being two-thirds of the first frequency; and a unit for encoding data to be written in accordance with a (1,7) encoding and decoding other data to be read in accordance with a (1,7) decoding, in response to the first and second clock pulses.

REFERENCES:
patent: 4488142 (1984-12-01), Franaszek
patent: 4672362 (1987-06-01), Furukawa et al.
patent: 4675652 (1987-06-01), Machado
patent: 4688016 (1987-08-01), Fok

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