NOISE CONTROL APPARATUS, NOISE CONTROLMETHOD, AND PROGRAM
To provide a noise control apparatus capable of stabilizing a noise suppression operation even when noise characteristics rapidly change in a manner that the noise control apparatus is controlled by correcting a coefficient of an adaptive filter, stopping a cancelling speaker, and the like in accordance with the current position of a vehicle such as a train. The noise control apparatus generates a cancellation signal to be reproduced by a cancelling speaker by performing an operation corresponding to position information m of a moving object in which the cancelling speaker used in active noise control is installed.
1 . A noise control apparatus that generates a cancellation signal to be reproduced by a cancelling speaker by performing an operation corresponding to position information m of a moving object in which the cancelling speaker used in active noise control is installed.
2 . The noise control apparatus according to claim 1 , comprising:
processing circuitry; and
a noise map information storage unit that stores information indicating whether or not a position is a position at which a noise characteristic greatly changes, wherein
in a determination processing the processing circuitry determines whether or not a position of the position information m is the position at which the noise characteristic greatly changes, with reference to the noise map information storage unit, and
in a suppression signal generation processing the processing circuitry generates the cancellation signal for suppressing noise by using a sound collection signal of a reference microphone and a model M a , and updates the model M a by using the sound collection signal of an error microphone, and
a different process is executed depending on whether or not the position of the position information m is the position at which the noise characteristic greatly changes.
3 . The noise control apparatus according to claim 2 , wherein
control is performed such that the active noise control is not performed in a case where the position of the position information m is the position at which the noise characteristic greatly changes.
4 . The noise control apparatus according to claim 2 , wherein
the noise map information storage unit stores the information indicating whether or not the position is the position at which the noise characteristic greatly changes and a model adapted to a changed noise characteristic at the position at which the noise characteristic greatly changes, and
in a case where the position of the position information m is the position at which the noise characteristic greatly changes, in the determination processing the processing circuitry extracts a model M b adapted to the changed noise characteristic corresponding to the position of the position information m from the noise map information storage unit, and changes the model M a used in the suppression signal generation processing to the model M b .
5 . A noise control method of generating a cancellation signal to be reproduced by a cancelling speaker by performing an operation corresponding to position information m of a moving object in which the cancelling speaker used in active noise control is installed.
6 . The noise control method according to claim 5 , the method, implemented by a noise control apparatus that includes processing circuitry, comprising:
assuming that information indicating whether or not a position is a position at which a noise characteristic greatly changes is stored in a noise map information storage unit;
a determination step in which the processing circuitry determines whether or not a position of the position information m is the position at which the noise characteristic greatly changes, with reference to the noise map information storage unit; and
a suppression signal generation step in which the processing circuitry generates the cancellation signal for suppressing noise by using a sound collection signal of a reference microphone and a model M a , and updates the model M a by using the sound collection signal of an error microphone,
wherein a different process is executed depending on whether or not the position of the position information m is the position at which the noise characteristic greatly changes.
7 . A non-transitory computer-readable recording medium having recorded thereon a program for causing a computer to function as the noise control apparatus according to claim 1 .