Excitation of air directing valves and air handling surfaces in the cancellation of air handling system noise

A piezoelectric vibrator (24) generates attenuating waves (20) in an air duct (12) in an automobile HVAC system (10) to cancel or reduce the noise created by sound waves (14). A processor (32) converts a sinusoidal noise signal (18) into an attenuation signal (34), which is the additive inverse of t...

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Bibliographic Details
Main Authors MICHELL, FRANK, URBAN, PAUL J
Format Patent
LanguageEnglish
French
German
Published 13.06.2007
Subjects
ACOUSTICS
ACOUSTICS NOT OTHERWISE PROVIDED FOR
METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL
MUSICAL INSTRUMENTS
PHYSICS
SOUND-PRODUCING DEVICES
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Summary:A piezoelectric vibrator (24) generates attenuating waves (20) in an air duct (12) in an automobile HVAC system (10) to cancel or reduce the noise created by sound waves (14). A processor (32) converts a sinusoidal noise signal (18) into an attenuation signal (34), which is the additive inverse of the sinusoidal noise signal (18). The processor (32) may include an inverter (36) or a phase-shifter (38) to create the attenuation signal (34), as well as an amplifier (40) to adjust the amplitude of the attenuation signal (34). The attenuation signal (34) drives the piezoelectric vibrator (24).
Bibliography:Application Number: EP20060077103