US PATENT SUBCLASS 348 / 536
.~ Automatic phase or frequency control

Current as of: June, 1999
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500  DF  SYNCHRONIZATION {11}
536.~ Automatic phase or frequency control {4}
537  DF  .~.~> Of sampling or clock {2}
540  DF  .~.~> Horizontal sync component {3}
547  DF  .~.~> Vertical sync component {1}
549  DF  .~.~> Using color subcarrier

DEFINITION

Classification: 348/536

Automatic phase or frequency control:

(under subclass 500) Subject matter including a means for automatically controlling the time or phase of an oscillating signal in response to sync signal components.