Digital read recovery with variable frequency compensation using

Details Digital read recovery with variable frequency compensation using Digital read recovery with variable frequency compensation using

1979-05-14

1981-11-03

Shaw, Gareth D.

Boots, shoes, and leggings

360 39, G06F 722, G11B 509

Patent

active

042989566

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 a modified frequency modulation (MFM) mode. A read head senses the flux transitions which are in turn converted to digital signals. A counter in the adapter starts to count when the adapter receives a digital signal. The count is transferred to a register and the counter presets when the adapter receives the next digital signal. The count is indicative of the time between the successive digital signals and should be representative of multiples of an integer. The count signals stored in the register address a read only memory whose output signals preset the counter to a value to compensate for the difference between the expected time and the actual time between the successive digital signals thereby reducing the read error rate.

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patent: 4109236 (1978-08-01), Besenfelder et al.
patent: 4118686 (1978-10-01), Lender
patent: 4173027 (1979-10-01), Rathbun

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