| 摘要 |
A noise control system includes: a control sound generator (1) for generating a control sound; an error detector (2) for detecting an error signal between the control sound and noise; a noise detector (3) for detecting a noise source signal; an adaptive filter (4) for outputting a control signal; and a coefficient updator for updating a coefficient of the adaptive filter (4). The coefficient updator includes at least a first digital filter (5), a first coefficient update calculator (6), a second digital filter (7), a phase inverter (10), a third digital filter (8), and a second coefficient update calculator (9). Alternatively, the coefficient updator includes at least a first digital filter, a second digital filter, a third digital filter, a coefficient update calculator, a phase inverter, a first adder, and a second adder. In either case, the coefficient updator has a function of suppressing an increase in a coefficient gain of the adaptive filter in a predetermined frequency band. <IMAGE> |
