[PD] Combat aliasing!

[Matteo Sisti Sette]

Pierre Massat escribió:
> Wait, so aliasing occurs when the signal is sampled?
> So if i have this patch :
> 
> [adc~]
> |
> |
> |
> [dac~]
> 
> and if the signal already contains frequencies above the Nyquist, i will 
> get aliasing? 

Well obviously (or not) a real-world ADC (e.g. a sound card) always 
includes an analog lowpass filter that cuts off the frequencies above 
Nyquit before actually digitalizing!!!!


However, when you sample a mathematically generated signal, such as:

[phasor~ 1000]
  |
[dac~]

then no filtering occurs, and aliasing does occur.

More evident:

[osc~ 40000]
  |
[dac~]





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Matteo Sisti Sette
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