US PATENT SUBCLASS 381 / 71.1
ACOUSTICAL NOISE OR SOUND CANCELLATION

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

71.1ACOUSTICAL NOISE OR SOUND CANCELLATION {7}
71.2  DF  .~> Acoustic, nonairborne vibration sensing or counterwave emission
71.3  DF  .~> From appliance
71.4  DF  .~> Within cabin or compartment of vehicle
71.5  DF  .~> Within duct
71.6  DF  .~> Adjacent ear
71.7  DF  .~> Particular transducer or enclosure structure
71.8  DF  .~> Counterwave generation control path {5}

DEFINITION

Classification: 381/71.1

ACOUSTICAL NOISE OR SOUND CANCELLATION:

(under the class definition) Subject matter, not elsewhere classifiable, comprising a noise cancellation system where audible noise is at least partially eliminated by generating and acoustically emitting an out-of-phase replica of an

offending sound.

SEE OR SEARCH THIS CLASS, SUBCLASS:

73.1, for sound or noise masking.

94.1+, for suppression of the effects of unwanted signals on desired signals.

SEE OR SEARCH CLASS

415, Rotary Kinetic Fluid Motors or Pumps,

119, for noise elimination in fans, turbines, jet engines, etc.