Digital frequency modulation and modified frequency...

Details Digital frequency modulation and modified frequency... Digital frequency modulation and modified frequency...

G - Physics

11

B

354/105, 352/19.

G11B 5/09 (2006.01) G11B 20/14 (2006.01)

Patent

CA 1150398

ABSTRACT Digital data is recorded on the surface of a magnetic media such as a disk or diskette in the form of magnetic flux transitions identifying clock and data information in either a frequency modulation (FM) mode or a modified frequency modulation (MFM) mode. A read head senses the flux transitions which are in turn converted to digital signals. Apparatus converts the time between suggestive digital signals into PROM addresses. The PROM address locations store coded signals identifying the data as binary ONE or binary ZERO signals.

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