[sdiy] DSO recommendation please

[JH.]

You're mixing up time resolution and voltage resolution.

JH.


----- Original Message ----- 
From: "Antti Huovilainen" <ajhuovil at cc.hut.fi>
To: "Paul Perry" <pfperry at melbpc.org.au>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, April 04, 2010 2:36 PM
Subject: Re: [sdiy] DSO recommendation please


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
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