Patent ID: 8891781
Filing Date: 2014-11-18
Classification: G10K,H04R,H04S

Abstract:
1. An active vibration noise control device having a pair of speakers which makes the speakers generate control sounds, comprising: a basic signal generating unit which generates a basic signal based on a vibration noise frequency generated by a vibration noise source; an adaptive notch filter which generates a first control signal provided to one of the speakers by applying a first filter coefficient to the basic signal and generates a second control signal provided to the other speaker by applying a second filter coefficient to the basic signal, in order to make the speakers generate the control sounds so that the vibration noise generated by the vibration noise source is cancelled; a microphone which detects a cancellation error between the vibration noise and the control sounds, and outputs an error signal; a reference signal generating unit which generates a reference signal from the basic signal based on a transfer function from the speakers to the microphone; a filter coefficient updating unit which updates the first and second filter coefficients used by the adaptive notch filter based on the error signal and the reference signal so as to minimize the error signal; and a phase difference limiting unit which limits a phase difference between a control sound generated by one of the speakers and a control sound generated by the other speaker.