US PATENT SUBCLASS 381 / 121
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Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

120  DF  WITH AMPLIFIER {1}
121.~ Feedback

DEFINITION

Classification: 381/121

Feedback:

(under subclass 120) Subject matter where a fraction of an output signal is returned to an input.

SEE OR SEARCH THIS CLASS, SUBCLASS:

71.1+, for acoustical sound cancellation.

83, for public address systems with feedback suppression.

93, for feedback suppression for audio systems in general.

95, for microphone circuits with feedback.

96, for loudspeaker circuits with feedback. 108, for automatic amplitude control having feedback.