Active vibration/noise control device

Abstract

An active vibration / noise control device which is provided with a plurality of cancel signal generation parts for generating output signals for respectively cancelling noises generated at a plurality of vibration / noise generation sources. The effect of the suspension of either of first and second cancel signal generation parts (11, 12) on the other is reduced. According to the operating state (a gain G1 is 0 or 1) of the first cancel signal generation part (11), the simulated transmission properties (C^) of the second cancel signal generation part (12) are adjusted. Consequently, without regard to the operating state of the first cancel signal generation part (11), the noise control performance of the second cancel signal generation part (12) can be maintained.

Description

technical field [0001] The present invention relates to an active vibration and noise control device, which has a plurality of canceling signal generating units, and the output signals generated by the plurality of canceling signal generating units are used to respectively cancel the noise generated by a plurality of vibration sources, as an application example , the above active vibration and noise control device is particularly suitable as a vehicle type active vibration and noise control device to reduce the noise in the vehicle cabin. Background technique [0002] In the prior art, there is such a vehicle-type active vibration and noise control device, which has a plurality of canceling signal generating parts, and the signal generating parts reduce the noise caused by various reasons (such as engine noise, road noise, and driving wind). Noise) and the noise generated in the cabin (Japanese Patent Laid-Open Publication No. Hei 7-104767). [0003] In the technology descr...

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Problems solved by technology

[0004] However, as will be described later, when each canceling signal generating unit is in operation, switching the operation (operating state) of a certain canceling signal generating unit will affect the noise control of other operating canceling signal generating units.

[0005] However, in the technology described in Japanese Patent Laid-Open Publication No. Hei 7-104767, there is no description about the influence of the operation switching of a certain canceling signal generating unit on other working canceling signal generating units.

[0006] In fact, when a certain canceling signal generator is stopped, the operation of other canceling signal generators that are still working will become unstable, or the follow-up characteristics of the system will deteriorate, and in the worst case, the noise will increase.

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