Head scanning servo system in a recording and/or reproducing app

Details Head scanning servo system in a recording and/or reproducing app Head scanning servo system in a recording and/or reproducing app

1982-04-02

1985-04-30

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318317, 318327, 318608, G05B 1928

Patent

active

045146713

ABSTRACT:
An improved microprocessor controlled scanning drum servo adapted for use in a recording and reproducing apparatus is disclosed. The scanner servo includes a velocity loop as well as a position loop, and by virtue of the fact that it is controlled by a microprocessor in a unique way, has extraordinary accuracy because the resolving power of the servo is essentially that of the microprocessor itself. The interrupts to the microprocessor occur in sequence with a first interrupt causing the microprocessor to cease current activity, store all required information in a stack register and thereafter wait until a subsequent interrupt occurs which enables it to immediately act to perform control operations with respect to the scanner servo. This enables the velocity loop to perform the vast majority of the work required by the servo and as a result of this, the phase closed servo loop operates as a positioning loop in the true sense.

REFERENCES:
patent: 4201936 (1980-05-01), Roumanis
patent: 4272818 (1981-06-01), McDaniel
patent: 4371819 (1983-02-01), Kaufmann
patent: 4381479 (1983-04-01), Wesling et al.
patent: 4412161 (1983-10-01), Cornaby
patent: 4413212 (1983-11-01), Okamoto et al.

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