andrew257
Member level 2
hi all
i am sampling an input sine wave to my system using an A/D, i am then measuring using a scope the output from my D/A.
The problem i have is with a 1khz sine wave going in from my function generator the output looks distorted and does not look like the input signal.
Now i was aware i must sample at least twice the highest frequency component which i am doing, in this case i am sampling at 44.1khz. More than enough for a 1khz input.
when i increase the input frequency the waveform becomes even more distorted
Am i wrong to think they wavefroms should look identical in shape size etc? What frequency does a sine wave have to be sampled at to get an identical match at the output?
i am assuming the Nyquist theorem is only to retrieve the frequency component of the waveform and not the actual shape?
i am sampling an input sine wave to my system using an A/D, i am then measuring using a scope the output from my D/A.
The problem i have is with a 1khz sine wave going in from my function generator the output looks distorted and does not look like the input signal.
Now i was aware i must sample at least twice the highest frequency component which i am doing, in this case i am sampling at 44.1khz. More than enough for a 1khz input.
when i increase the input frequency the waveform becomes even more distorted
Am i wrong to think they wavefroms should look identical in shape size etc? What frequency does a sine wave have to be sampled at to get an identical match at the output?
i am assuming the Nyquist theorem is only to retrieve the frequency component of the waveform and not the actual shape?