[sdiy] DSO recommendation please

[Antti Huovilainen]

On Sun, 4 Apr 2010, Paul Perry wrote:

> "A sinewave can be
> sampled perfectly well in 8 bits if the reconstructive algorithm is
> matched to the ADC.."
>
> Yes, but how do you know it is a sinewave?

Sampling theorem. Any bandlimited signal can be constructed as a sum of 
sinusoids. As long as the ADC sampling rate is > 2x higher than the 
stopband of the input lowpass filter, you can reconstruct the signal just 
fine.

Granted, you do have some quantization distortion and noise, but that's at 
-50dB. It's not like most analog scopes have higher accuracy than 0.5% 
either :).

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova