Modified frequency modulation

Details Modified frequency modulation Modified frequency modulation

1980-07-08

1983-03-15

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 43, 360 51, G11B 509

Patent

active

043769586

ABSTRACT:
There is described methods and circuitry for decoding modified frequency modulated (MFM) information signals as obtained from rotating magnetic storage devices, such as floppy disks and hard disks used in computers. The novel technique involves twice squaring an information carrying data signal mathematically and without saturation, deriving a clock signal from the twice squared data signal using a phase lock loop and thereafter recovering an information signal from said data signal and clock signal.

REFERENCES:
patent: 3404391 (1968-10-01), Chur
patent: 3794987 (1974-02-01), Walenrz
patent: 3846829 (1974-11-01), Lin
patent: 3968328 (1976-07-01), Tsochoya et al.

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