US PATENT SUBCLASS 381 / 150
ELECTRO-ACOUSTIC AUDIO TRANSDUCER

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

150ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
151  DF  .~> Body contact wave transfer (e.g., bone conduction earphone, larynx microphone)
152  DF  .~> Driven diverse static structure (e.g., wall, sounding board)
337  DF  .~> Having acoustic wave modifying structure {5}
161  DF  .~> With mechanical amplifier arrangement
162  DF  .~> Detail of mechanical vibration coupling to transducer (e.g., tuned vibrating element)
163  DF  .~> Having bi-directional transducer
164  DF  .~> Thermal response to, or generation of, sound vibration
165  DF  .~> By modifying fluid flow
166  DF  .~> Having a fluid as a conducting element {1}
355  DF  .~> Housed microphone {4}
369  DF  .~> Microphone capsule only {10}
182  DF  .~> Plural or compound reproducers {4}
385  DF  .~> Having body supported structure other than on head
386  DF  .~> Mounting or support feature of housed loudspeaker {9}
189  DF  .~> Having protective or sheilding feature
190  DF  .~> Electrostrictive, magnetostrictive, or piezoelectric
191  DF  .~> Having electrostatic element (e.g., electret, vibrating plate)
396  DF  .~> Electromagnetic (e.g., dyynamic) {8}

DEFINITION

Classification: 381/150

ELECTRO-ACOUSTIC AUDIO TRANSDUCER:

(under the class definition) Subject matter having a structure or process for converting an information signal between audible sound vibrations and a corresponding time-varying electrical quantity.

(1) Note. Included herein are instruments such as microphones, speakers earphones, and housings or supports peculiar thereto. However, combinations with circuitry, other than leads, terminals, or connectors, are not classified herein, but are classified in the preceding subclasses of this class (381).

(2) Note. The audible sound vibrations are generally speech or music.

SEE OR SEARCH CLASS

181, Acoustics, appropriate subclasses for an attachment to a casing of an audio transducer.

310, Electrical Generator or Motor Structure,

300+, for a piezoelectric transducer not limited to audio utility. 367, Communications, Electrical: Acoustic Wave System and Devices,

140+, for a nonaudio acoustical transducer.