Adaptive active noise reduction system for an engine exhaust sound

摘要

(57) [summary] [purpose] The present invention relates to an adaptive active silencer of the engine exhaust sound, and aims to actively silencing using an adaptive filter the engine exhaust sound. [Configuration] provided with a vibration generator 2 which outputs the vibration waveform signal directed into the exhaust pipe 1 of the engine E, and the reference signal detection means 4 for detecting a high signal correlated with the exhaust sound as a reference signal, the exhaust pipe outlet and a control point signal detecting section 5 for detecting exhaust sound as the control point signal, in response to the control point signal detected by the reference signal and said control point signal detecting means 5 which is detected by the reference signal detection means 4 It is configured to provide a control unit 6 using an adaptive filter for the control point signals for controlling the vibration signal from exciter 2 so as to minimize.