Combined speed control and sectoring index for disc recorders an

Details Combined speed control and sectoring index for disc recorders an Combined speed control and sectoring index for disc recorders an

1977-04-21

1979-03-27

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 73, 318603, G11B 1554, G11B 1518, G05B 1928

Patent

active

041469100

ABSTRACT:
The specification discloses a method and apparatus for providing speed control and rotational indexing of a disc recorder, based upon a particular use of a plurality of electrical pulses produced, for example, as the slots of a slotted wheel, axially coupled to a recording disc, pass a transducer. The primary repetition rate of pulses in response to equally-spaced slots is used for speed control of the recording disc. A secondary pulse rate occurring between two successive pulses resulting from adjacent slots with different spacing is used to establish an index pulse correlated with a reference point on the disc.

REFERENCES:
patent: 3967177 (1976-06-01), Scholten et al.

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