Combined speed control and sectoring index for disc...

Details Combined speed control and sectoring index for disc... Combined speed control and sectoring index for disc...

G - Physics

11

B

341/88, 352/21.2

G11B 19/26 (2006.01) G11B 17/00 (2006.01) G11B 27/10 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1116746

ABSTRACT OF THE DISCLOSURE 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.

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