Electronic apparatus

An electronic apparatus comprising:

• a processor;
• a first electronic circuit is configured to output a pulse width modulation signal having a frequency;
• a low-pass filter circuit is configured to output a voltage based on the pulse width modulation signal;
• a second electronic circuit is configured to output an analog signal by using the output voltage of the low-pass filter circuit;
• and
• a third electronic circuit is configured to convert the analog signal into a digital signal,
• wherein a harmonic noise which is a noise component having the same frequency as the frequency of the pulse width modulation signal is generated by the first electronic circuit and is superimposed on the third electronic circuit and is converted into an aliasing noise in the digital signal, and
• the processor is configured to set the frequency of the pulse width modulation signal to a frequency, wherein the aliasing noise at the frequency included in the digital signal does not appear in a frequency band equal to or less than ¼ of a sampling frequency of the third electronic circuit,
• wherein the first electronic circuit is configured to output n pulse width modulation signals,
• n is an integer of 2 or more, and
• the processor is configured to perform control of setting frequencies of the n pulse width modulation signals to a same frequency and shifting phases of the n pulse width modulation signals by 360/n degrees respectively.