US PATENT SUBCLASS 381 / 111
CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER

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

111CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER {6}
112  DF  .~> With carbon microphone
113  DF  .~> With electrostatic microphone
114  DF  .~> With piezoelectric microphone
115  DF  .~> With magnetic microphone
116  DF  .~> With electrostatic loudspeaker
117  DF  .~> With magnetic loudspeaker

DEFINITION

Classification: 381/111

CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER:

(under the class definition) Subject matter combined with a specific audio-to-electrical signal or electrical-to-audio transducer.

(1) Note. Classified herein are microphone or loudspeakers combined with a diverse type of circuit (e.g., amplifier) or circuit element (e.g., resistor) other than a lead or connector.

SEE OR SEARCH THIS CLASS, SUBCLASS:

122, for audio signal systems having a generic microphone.

150+, for a specific type of microphone or loudspeaker.