Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1976-05-03
1980-11-04
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318313, 318328, 318608, 318270, 360 73, H02P 516
Patent
active
042322570
ABSTRACT:
A professional audio tape transport capstan control system includes a single capstan continuously engaging a length of tape to provide bidirectional motion control in all modes of operation. A D.C. capstan drive motor is directly coupled to the capstan and energized for precise control over tape motion. A hybrid servo switches between digital position phase lock velocity control and analog constant acceleration control to provide both precise control over play speed and rapid acceleration. With acceleration to a stabilized play speed occurring in less than 0.5 sec an operator may treat the acceleration time as instantaneous for most applications.
REFERENCES:
patent: 3185364 (1965-04-01), Kleist
patent: 3293522 (1966-12-01), Lewis
patent: 3482229 (1969-12-01), Burr
patent: 3577056 (1971-05-01), Tsujikawa
patent: 3648141 (1972-03-01), Scheer
patent: 3693061 (1972-09-01), Kahle
patent: 3889169 (1975-06-01), Hirschman
patent: 3969663 (1976-07-01), Arthur et al.
patent: 4002962 (1977-01-01), Miller
James C. Strickland, "Optimizing Tape Transport Motion Control Using Operational Amplifier Analog Signal Processing", Journal of the Audio Engineering Society.
Ampex Corporation
Clay Robert G.
Mutter Michael K.
Roth Gregory L.
Smith Jr. David
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