US PATENT SUBCLASS 375 / 337
.~.~.~ Separate mark and space channels

Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS

316  DF  RECEIVERS {9}
322  DF  .~ Angle modulation {4}
334  DF  .~.~ Frequency shift keying {3}
337.~.~.~ Separate mark and space channels

DEFINITION

Classification: 375/337

Separate mark and space channels:

(under subclass 334) Subject matter in which one frequency is received over one channel and the other frequency is received over another separate channel within the receiver.

(1) Note. Systems with entirely independent paths between the transmitter and receiver will not be found here but in subclass 260.