Projector, cooling apparatus, and control method

A cooling apparatus comprising:

• a fan that causes a cooling gas to flow to a heat source;
• a loudspeaker that outputs a sound wave according to a drive signal inputted to the loudspeaker;
• a characteristic data storage section that stores frequency characteristic data on frequency characteristics of first noise containing discrete frequency noise produced by the driven fan, broadband noise based on a flow of the cooling gas generated by the driven fan, and environmental noise in accordance with a rotational speed of the fan per unit time;
• and
• a control section that generates the drive signal to be outputted to the loudspeaker,
• wherein the control section includes
• a characteristic acquisition section that acquires the frequency characteristic data corresponding to the rotational speed of the fan per unit time from the characteristic data storage section,
• a waveform generation section that generates a waveform of an interference sound that reduces the first noise based on the frequency characteristic data acquired by the characteristic acquisition section, and
• a signal output section that outputs the drive signal based on the waveform generated by the waveform generation section to the loudspeaker.

A control method executed by an electronic instrument including a fan that causes a cooling gas to flow to a heat source and a loudspeaker that outputs a sound wave according to a drive signal inputted to the loudspeaker, the method comprising:

• acquiring frequency characteristic data on frequency characteristics of first noise containing discrete frequency noise produced by the driven fan, broadband noise based on a flow of the cooling gas generated by the driven fan, and in-apparatus environmental noise in accordance with a rotational speed of the fan per unit time;
• generating a waveform of interference sound that interferes with the first noise leaking out of the electronic instrument based on the acquired frequency characteristic data;
• and
• outputting the drive signal based on the generated waveform of the interference sound to the loudspeaker.