US PATENT SUBCLASS 348 / 9
.~ Controlled signal substitution (e.g., emergency warning, local preemption, etc.)

Current as of: June, 1999
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348 /   HD   TELEVISION

6  DF  WIRED BROADCAST (E.G., CABLE) {5}
9.~ Controlled signal substitution (e.g., emergency warning, local preemption, etc.)

DEFINITION

Classification: 348/9

Controlled signal substitution (e.g., emergency warning, local preemption, etc.):

(under subclass 6) Subject matter wherein provision is made for program or information substitution which is beyond the control of a viewer.

(1) Note. For example, emergency warning is substituted for a regular channel program or a local program is substituted for an out of town channel selected by the viewer.