Active noise reducing device

An active noise reducing device canceling vibration and noise based on the output of an adaptive notch filter (4), wherein when the amount of a variation between the present value and the past value within a specified time of engine pulses inputted into the adaptive notch filter (4) is equal to or h...

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Bibliographische Detailangaben
1. Verfasser:	KAN YOICHI,NAKAMURA YOSHIO,ONISHI MASAHIDE,INOUE TOSHIO,TAKAHASHI AKIRA,KOBAYASHI YASUNORI
Format:	Patent
Sprache:	eng
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:	An active noise reducing device canceling vibration and noise based on the output of an adaptive notch filter (4), wherein when the amount of a variation between the present value and the past value within a specified time of engine pulses inputted into the adaptive notch filter (4) is equal to or higher than a specified value, an engine pulse monitoring means (25) cuts off a switch (26) to stop the output of the adaptive notch filter (4). Before the update speed of a coefficient of adaptive notch filter cannot follow up an engine speed when the engine speed is suddenly changed and the adaptive notch filter (4) is diverged, the output of the adaptive notch filter (4) is stopped to prevent abnormal noise from occurring. Thus, even if the engine pulses are suddenly changed, the abnormal noise outputted from the adaptive notch filter (4) does not reach a user.