What is the purpose of a low-pass filter used at the output of a digital-to-analog converter?
Lower the input bandwidth to increase the effective resolution
Improve accuracy by removing out-of-sequence codes from the input
Remove spurious sampling artifacts from the output signal✓Richtige Antwort
All these choices are correct
Erklärung
A digital-to-analog converter builds its output from discrete steps held between samples, which places images of the wanted signal around multiples of the sampling frequency together with step-edge harmonics. The low-pass reconstruction filter removes those sampling artifacts and leaves the smooth analog waveform; it changes neither the code stream nor the converter's resolution.