US PATENT SUBCLASS 370 / 497
.~.~ Using particular filtering technique

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}
497.~.~ Using particular filtering technique

DEFINITION

Classification: 370/497

Using particular filtering technique:

(under subclass 480) Subject matter employing devices that allow signals of certain frequencies to pass for signal combination or separation.