US PATENT SUBCLASS 370 / 495
.~.~.~ Data under voice

Current as of: June, 1999
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370 /   HD   MULTIPLEX COMMUNICATIONS

464  DF  COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS {9}
480  DF  .~ Combining or distributing information via frequency channels {11}
493  DF  .~.~ Combined voice and data transmission {2}
495.~.~.~ Data under voice

DEFINITION

Classification: 370/495

Data under voice:

(under subclass 493) Subject matter wherein data are transmitted on a carrier frequency lower than the voice frequency range.