Patent ID: 8817998

Claim:
An active vibratory noise control apparatus comprising: a basic signal generator configured to output a basic sine wave signal and a basic cosine wave signal as basic signals, each of the basic sine wave signal and the basic cosine wave signal having a frequency that is based on a frequency of vibratory noise generated from a vibratory noise source; an adaptive finite impulse response filter configured to generate a control signal based on the basic cosine wave signal or the basic sine wave signal using first to M-th filter coefficients in order to cancel the vibratory noise generated from the vibratory noise source where “M” is an integer equal to or greater than 2 and is defined as a predetermined number of taps of the adaptive finite impulse response filter, the adaptive finite impulse response filter being configured to respectively multiply first to M-th input signals sequentially input from the basic signal generator by the first to M-th filter coefficients to generate the control signal, the first input signal being the latest among the first to M-th input signals, the M-th reference signal being the oldest among the first to M-th input signals; a vibratory noise cancelling device configured to generate vibratory-noise canceling sound based on the control signal; an error signal detector configured to output an error signal that is based on a difference between the vibratory noise and the vibratory-noise canceling sound; a reference signal generator configured to sequentially generate a reference signal which is a sum of a corrected basic cosine wave signal and a corrected basic sine wave signal, the reference signal generator being configured to correct the basic cosine wave signal and the basic sine wave signal based on correction values regarding transfer characteristics from the vibratory noise cancelling device to the error signal detector with respect to frequencies of the basic signals to obtain the corrected basic cosine wave signal and the corrected basic sine wave signal; a buffer configured to accumulate first to M-th reference signals sequentially generated in the reference signal generator by a number equal to the predetermined number of taps of the adaptive finite impulse response filter, the first reference signal being the latest among the first to M-th reference signals, the M-th reference signal being the oldest among the first to M-th reference signals; and a filter coefficient updating device configured to sequentially update the first to M-th filter coefficients of the adaptive finite impulse response filter so that the error signal is minimized based on the error signal and the respective first to M-th reference signals accumulated in the buffer.