Active noise reduction system, active noise reduction method, and non-transitory computer-readable storage medium

An active noise reduction method, comprising:

• acquiring buffer data in which noise signals generated based on a noise are stored in a time series;
• generating a plurality of divided data by dividing the buffer data;
• calculating a correlation value of the buffer data based on the plurality of divided data;
• detecting presence/absence of disturbance mixed in the buffer data based on the correlation value;
• and
• switching control over a canceling sound according to the presence/absence of the disturbance mixed in the buffer data.

A non-transitory computer-readable storage medium comprising an active noise reduction program,

• wherein the active noise reduction program, when executed by a processor, executes an active noise reduction method comprising:
• acquiring buffer data in which noise signals generated based on a noise are stored in a time series;
• generating a plurality of divided data by dividing the buffer data;
• calculating a correlation value of the buffer data based on the plurality of divided data;
• detecting presence/absence of disturbance mixed in the buffer data based on the correlation value;
• and
• switching control over a canceling sound according to the presence/absence of the disturbance mixed in the buffer data.