US PATENT SUBCLASS 381 / 353
.~.~.~ Acoustic damping or attenuating resonator

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

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
337  DF  .~ Having acoustic wave modifying structure {5}
345  DF  .~.~ Acoustic enclosure {6}
353.~.~.~ Acoustic damping or attenuating resonator

DEFINITION

Classification: 381/353

Acoustic damping or attenuating resonator:

(under subclass 345) Subject matter in which a) the acoustic properties of a cavity are used to compensate for mechanical shock, i.e., to effectively cancel transmission of the shock to the transducer's output, or b) the resonant property of a cavity is used to absorb or attenuate sound at a particular frequency or over a band of frequencies.

(1) Note. A "quarter wave" Helmholtz resonator is a typical example of the subject matter included under definition (b) above.