US PATENT SUBCLASS 379 / 281
.~.~.~.~ Conversion between dial pulse and voice frequency signal

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
258  DF  .~ Switching controlled in response to called station addressing signal {9}
268  DF  .~.~ Having shared or common switching control {8}
280  DF  .~.~.~ Including registering or storing device for call address signal {7}
281.~.~.~.~ Conversion between dial pulse and voice frequency signal

DEFINITION

Classification: 379/281

Conversion between dial pulse and voice frequency signal:

(under subclass 280) Subject matter which changes the call address signal between a pattern of abrupt variation in a DC signal such as pulses and corresponding tone frequencies and variations thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

339, for signal conversion in a telephone repeater.