[sdiy] samp. freq for ADSR ?

[Robert Holmström]

> > > Creating a 500Hz sampling frequency. Nyquist's theory is that the
> > > maximum sampled frequency is half the sample rate, leaving the Buchla
> > > MARF with a maximum of 250Hz (real low for audio).
> >

I am not an expert in this so maybe somebody can explain it (simple) but 
this is how I understand it.

As written above the maximum sampled frequency is half the sample rate. This 
means that if I want a 1Hz (low, just as an example) signal sampled, the 
minimum samplingfrequency should be 2Hz.

That sampled signal would be a 1Hz "square waveform" because only two 
samples are taken in one full wave cycle. If I need any precision in the 
sampled signal (like if the source was a saw waveform), I need higher 
samplerate.

If the above is a correct explanation (?) that would explain why bass sounds 
sound "good" on lower sample rates while high frequencys sounds "metallic". 
The bass frequency waveforms are so long that a lower sample rate still 
gives us an "accurate" sampled wave.

Maybe I went a bit outside the ADSR subject, but I have wanted to ask this 
for soo long that I thought it was good.


Robert

_________________________________________________________________
Få alle de nye og sjove ikoner med MSN Messenger http://www.msn.dk/messenger