Active noise reduction system

Abstract

An electromechanical converter (2) has independent electric input sections (3, 4). The output of an active noise reduction controller (1) is inputted into an electric input section (3) and the audio signal from an audio section (9) is inputted into an electric input section (4). These are mechanically combined at a vibration section (7) and the combined signal is radiated as a sound wave into the space (8). With such a structure, both the active noise reduction function and the audio reproduction function are realized without installing a large device in an existing audio reproduction apparatus.

Description

technical field [0001] The present invention relates to an active noise reduction system for actively reducing vibration noise, in particular to a structure for actively reducing noise inside a vehicle compartment, so as to minimize the noise inside the compartment from affecting the overall structure and equipment of the vehicle. Background technique [0002] In a general active noise reduction device, there is known a noise reduction method that extracts a signal highly correlated with noise, processes it with an adaptive filter, and applies it to a speaker such as an electrical-mechanical converter. device, as an interference wave signal to interfere with the noise. [0003] Standard vehicles are equipped with an audio system. Therefore, it is reasonable to use audio amplifiers used in these audio systems and the like together with speakers as electro-mechanical converters as active-type reducing devices. Actually, when such an active noise reduction device is applied t...

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Problems solved by technology

[0007] And, this time, when the switch of the audio system is turned on from such a state where only noise reduction is performed, there is a possibility that a transition sound (pop sound) may be generated because the audio control part of the previous stage is pulled up by the power amplifier.

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