H - Electricity – 02 – P
Patent
H - Electricity
02
P
341/88, 352/21.2
H02P 5/00 (2006.01) G11B 15/54 (2006.01) H02P 7/288 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1102902
Abstract of the Disclosure A servo system is disclosed for accurately regulating velocity of a rotating drum, preferably for guiding a magnetic tape of a recording and reproducing system. The method and apparatus is characterized in that generation of a ramp signal is commenced in response to a first one of a series of tach signals provided at a rate proportional to the velocity of rotation of the drum, the ramp signal being interrupted for a predetermined time duration and thereafter recommenced, the ramp signal subsequently being monitored or detected upon occurrence of a second tach signal in order to produce an error signal for adjusting velocity of the drum motor means and maintaining the proper drum velocity.
274286
Ampex Corporation
Macrae & Co.
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