| 摘要 |
PROBLEM TO BE SOLVED: To provide a &Dgr;&Sgr; modulation system that keeps cost low.SOLUTION: The &Dgr;&Sgr; modulation system includes: a &Dgr;&Sgr; modulator 25 for outputting a quantized signal as an i[bit] (i is an integer of one or greater) digital signal; a PWM control section 45 for outputting a PWM signal having a duty ratio corresponding to the magnitude of the quantized signal indicated by the i[bit] digital signal output from the &Dgr;&Sgr; modulator 25; and a low pass filter 55 for receiving the PWM signal output from the PWM control section. |
