US PATENT SUBCLASS 370 / 526
.~.~.~ Digital tone detection

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

464  DF  COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS {9}
498  DF  .~ Combining or distributing information via time channels {17}
522  DF  .~.~ Signaling (ancillary to main information) {6}
526.~.~.~ Digital tone detection

DEFINITION

Classification: 370/526

Digital tone detection:

(under subclass 522) Subject matter including a detector of digital tone or digital wave signals.