Nested loop video disc servo system

Details Nested loop video disc servo system Nested loop video disc servo system

1979-09-11

1981-01-27

Fears, Terrell W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

3581286, 360 36, H04N 576

Patent

active

042478669

ABSTRACT:
An active filter separates the function of a principal feedback loop which provides velocity error correction from that of a nested feedback loop which provides video signal frequency correction. A further feedback loop responsive to the active filter output signal and normally open under steady-state conditions, is closed under transient conditions for supplying a limited gain reducing signal to the input of the active filter whereby transient disturbance of the primary and nested loops is minimized with no loss of loop gain under steady-state conditions. The third loop includes a dead zone amplifier for distinguishing between transient and steady-state conditions and a limiter for limiting the gain reducing signal to a level below that which otherwise would tend to drive the active filter into a non-linear slow recovery condition.

REFERENCES:
patent: 3871020 (1975-03-01), Wilber
patent: 3873990 (1975-03-01), Wilber
patent: 3965482 (1976-06-01), Burrus

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