Digital frequency modulation and modified frequency modulation r

Details Digital frequency modulation and modified frequency modulation r Digital frequency modulation and modified frequency modulation r

1979-05-14

1982-03-16

Shaw, Gareth D.

Boots, shoes, and leggings

360 39, G11B 509, G06F 1304

Patent

active

043204651

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 successive digital signals into PROM addresses. The PROM address locations store coded signals identifying the data as binary ONE or binary ZERO signals.

REFERENCES:
patent: 3108261 (1963-10-01), Miller
patent: 4000513 (1976-12-01), Precourt
patent: 4034348 (1977-07-01), Rathbun
patent: 4040022 (1977-08-01), Takii
patent: 4173027 (1979-10-01), Rathbun
patent: 4212038 (1980-07-01), Rathbun

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