Patent ID: 6853321

Claim:
A digital-to-analog converter for converting a digital signal to an analog signal comprising: a modulator for applying Delta-Sigma modulation to the digital signal to generate a code sequence; a first post-filter having a first-order attenuation characteristic of performing low-pass filtering to the code sequence; and a second post-filter having another first-order attenuation characteristic of performing low-pass filtering to an output signal from said first post-filter, and for outputting the processed analog signal; wherein a cutoff frequency of said first post-filter is set in a frequency range between a cutoff frequency of said second post-filter and a maximum frequency at which the attenuation of said second post-filter reaches a predetermined value of attenuation, in order to simultaneously execute processing such as de-emphasis in a frequency range between said cutoff frequency of said second post-filter and said first post-filter, and elimination of high-frequency noise over said cutoff frequency of said first post-filter.