US PATENT SUBCLASS 455 / 70
.~.~ Receiver control signal originates at message transmitter

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

39  DF  TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
68  DF  .~ With control signal {2}
70.~.~ Receiver control signal originates at message transmitter {2}
71  DF  .~.~.~> Frequency control
72  DF  .~.~.~> For compression and expansion of message signal (i.e., companding)

DEFINITION

Classification: 455/70

Receiver control signal originates at message transmitter:

(under subclass 68) Subject matter wherein the controlling means is located at the transmitter and modifies the operation of the receiver in response to said controlling means.

(1) Note. The controlling means may send a reference or controlling modulation component on the carrier wave. However, such component must be distinct from the message, as receivers responsive to the inherent characteristics of the message signal are excluded from this subclass.