Friday, 22 July 2005
A.Farina,
L.Tronchin
14/86
ADC
(Analog to Digital Converter) 3
Low-pass filtering must be
applied before entering the ADC,
otherwise the signal will be aliased
Example: pure tone of 35 kHz
Sample rate 48 kHz, Nyquist freq. 24 kHz, difference = 11 kHz
After digital conversion will be 13 kHz (i.e. 24-11
kHz)
Solution: low-pass antialiasing filters, oversampling