SPEAKER SYSTEM FOR NOISE CANCELLER

PURPOSE:To realize the speaker system for a noise canceller capable of obtaining a certain silencing effect regardless of dispersion of the individual performance of the speaker or aging change. CONSTITUTION:The speaker system for noise canceller silencing noise by generating a sound of an inverse p...

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Bibliographic Details
Main Author ISHII DAISAKU
Format Patent
LanguageEnglish
Published 20.05.1994
Edition5
Subjects
BLASTING
DEAF-AID SETS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
ENGINE PLANTS IN GENERAL
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL
HEATING
LIGHTING
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
PUBLIC ADDRESS SYSTEMS
STEAM ENGINES
WEAPONS
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Summary:PURPOSE:To realize the speaker system for a noise canceller capable of obtaining a certain silencing effect regardless of dispersion of the individual performance of the speaker or aging change. CONSTITUTION:The speaker system for noise canceller silencing noise by generating a sound of an inverse phase from the speaker based on data prepared in advance corresponding to the characteristic of noise from a sound source is featured to be provided with impedance characteristic detection means 6, 7 detecting the impedance characteristic of the speaker and a sound pressure control means 5 generating the sound signal of an inverse phase, referring to the impedance characteristic detected by the impedance characteristic detection means to detect the phase and amplitude of a diaphragm of the speaker and controlling the sound signal of the inverse phase based on the difference between the initial phase and amplitude and detected phase and amplitude.
Bibliography:Application Number: JP19920289932