Patent ID: 9626954
Date: 2017-04-18
CPC Classifications: G10K

Claim:
1. An active vibration or noise control apparatus comprising: a control signal filter that receives a sound source signal determined from control frequency specified in conformity with a vibration or noise source which produces vibration or noise and that outputs a control signal; a filter coefficient updater that updates coefficients of the control signal filter in response to an error signal and the sound source signal, the error signal resulting from interference between the vibration or noise and secondary vibration or noise generated from the control signal; a signal-to-interference ratio measurer that determines a signal-to-interference ratio from the vibration or noise and interference contained in the error signal in response to the control frequency and the error signal, and outputs the signal-to-interference ratio; and an update controller that adjusts an update step of the filter coefficient updater in conformity with the signal-to-interference ratio.