Patent ID: 8848937
Filing Date: 2014-09-30
Classification: G10K

Abstract:
1. An active noise control apparatus, comprising: a first active noise controller for generating a first canceling signal for a first noise type, the first active noise controller including a first adaptive notch filter; a second active noise controller for generating a second canceling signal for a second noise type that is different from the first noise type, the second active noise controller including a second adaptive notch filter; a mixer for mixing the first canceling signal and the second canceling signal into a mixed canceling signal; a canceling sound output unit for outputting a canceling sound based on the mixed canceling signal; and an amplitude suppressor for calculating an amplitude of the first canceling signal based on a filter coefficient of the first adaptive notch filter, calculating an amplitude of the second canceling signal based on a filter coefficient of the second adaptive notch filter, and suppressing the amplitude of the second canceling signal depending on the amplitude of the first canceling signal, wherein if the amplitude of the second canceling signal cannot be assigned within a value range which is produced when the amplitude of the first canceling signal is subtracted from a maximum output amplitude allowed by the mixer, the amplitude suppressor decreases the filter coefficient of the second adaptive notch filter to fade out the second canceling signal.