Patent ID: 11922916
Assignee: ALPS ALPINE CO., LTD.
Field: Other consumer goods (Other fields)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An active noise control system for reducing noise, the active noise control system comprising:
a first area microphone that is a microphone disposed in a first area;
a second area speaker that is a speaker that outputs sound to a second area;
a second area microphone that is a microphone disposed in the second area;
a second area sound source device that outputs a sound output from the second area speaker;
a first adder that adds an output of the first area microphone and an output of the second area sound source device;
an echo cancellation adaptive filter that receives an output of the first adder as an input;
a second adder that adds an output of the second area microphone and an output of the echo cancellation adaptive filter;
a noise cancellation adaptive filter that receives a noise signal representing noise for a user in the second area as an input; and
a third adder that outputs a signal obtained by adding the output of the first area microphone, the output of the second area sound source device, and the output of the noise cancellation adaptive filter to the second area speaker, wherein
the echo cancellation adaptive filter updates a filter coefficient such that an output of the second adder is regarded as an error and the error is minimized, and
the noise cancellation adaptive filter updates a filter coefficient such that the output of the second adder is regarded as an error and the error is minimized.