ACTIVE NOISE REDUCING DEVICE

In an active noise control system which cancels vibration and noise based on an output from an adaptive notch filter (4), when the difference between the current engine pulse value input to the adaptive notch filter (4) and one past value within a predetermined time period exceeds a predetermined le...

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Bibliographische Detailangaben
Hauptverfasser:	KAN, YOICHI, TAKAHASHI, AKIRA, ONISHI, MASAHIDE, INOUE, TOSHIO, KOBAYASHI, YASUNORI, NAKAMURA, YOSHIO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR BLASTING 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 MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PERFORMING OPERATIONS PHYSICS SOUND-PRODUCING DEVICES STEAM ENGINES TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR WEAPONS
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Beschreibung
Zusammenfassung:	In an active noise control system which cancels vibration and noise based on an output from an adaptive notch filter (4), when the difference between the current engine pulse value input to the adaptive notch filter (4) and one past value within a predetermined time period exceeds a predetermined level, engine pulse monitoring means (25) turns off a switch (26) to stop the output from the adaptive notch filter (4), so that, when there is a sudden change in the engine rpm, the output from the adaptive notch filter (4) is stopped before the renewal speed of the adaptive notch filter coefficient becomes too fast to follow and the coefficient diverges, to prevent generation of abnormal sound. With this active noise control system, the user will not hear any abnormal sound from the adaptive notch filter (4) even when there is a sudden change in the engine pulse.