Patent ID: 7873173

Claim:
An apparatus for actively controlling vibratory noise, comprising: reference wave signal generating means for outputting a reference wave signal having a harmonic frequency selected from frequencies of vibration or noise generated from a vibratory noise source; an adaptive notch filter for outputting a control signal based on said reference wave signal in order to cancel vibratory noise; vibratory noise canceling means for generating a vibratory noise canceling sound based on said control signal; error signal detecting means for outputting an error signal based on a difference between said vibration or noise and said vibratory noise canceling sound; phase correcting means for correcting said reference wave signal into a reference signal based on a measured value representing phase characteristics with respect to a frequency of said reference wave signal in transfer characteristics from said vibratory noise canceling means to said error signal detecting means, and outputting said reference signal; filter coefficient updating means for sequentially updating a filter coefficient of said adaptive notch filter in order to minimize said error signal based on said error signal and said reference signal, wherein said reference wave signal generating means has waveform data storage means for storing waveform data representing instantaneous value data at respective divided positions where one period of a sine wave or a cosine wave is divided by a predetermined number, and successively reads said waveform data from said waveform data storage means per sampling to generate said reference wave signal, wherein said phase correcting means has measured data storage means for storing said measured value with respect to said frequency of said reference wave signal, and said phase correcting means reads said measured value from said measured data storage means by referring to said frequency of said reference wave signal, shifts an address at which said reference wave signal generating means reads said waveform data from said waveform data storage means, by said measured value, and reads said waveform data from said shifted address of said waveform data storage means as said reference signal; and a gain setting unit for correcting a gain of the read-out reference signal, wherein in gain characteristics measured with respect to said frequency of said reference wave signal in transfer characteristics from said vibratory noise canceling means to said error signal detecting means, corrective gain characteristics are set to said gain setting unit by increasing the gain at a frequency where the measured gain characteristics drop, and wherein the read-out reference signal from said phase correcting means is corrected based on the corrective gain characteristics without correcting the measured phase characteristics at the frequency where the measured gain characteristics drop, and then supplied to said filter coefficient updating means as said reference signal.