US PATENT SUBCLASS 379 / 408
.~.~ Control by pilot frequency signal

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


379 /   HD   TELEPHONIC COMMUNICATIONS

399  DF  SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE {5}
406  DF  .~ Echo suppression, antisinging, or reverse path blocking {4}
408.~.~ Control by pilot frequency signal

DEFINITION

Classification: 379/408

Control by pilot frequency signal:

(under subclass 406) Subject matter wherein the undesirable signal is prevented by equipment responsive to a reference frequency signal.