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Re: [Discuss-gnuradio] signal distortion in simple code

From: Dan Gisselquist
Subject: Re: [Discuss-gnuradio] signal distortion in simple code
Date: Thu, 30 Dec 2004 21:35:48 +0000


(Sorry for the resend ... I had intended to send to the maillist as well ...)

Looking closely at this problem, it looks like you may have buffer problems--that is, you may be missing buffers by not keeping up with the raw data rate.

Tell me, are the phase jumps multiples of the buffer length in time?

Another way to debug this problem would be to take the output of your A/D straight to whatever you have that's really fast. (Big memory window, disk if it's fast enough) Don't do any processing on it. After you've gotten a sizeable enough chunk of it (a couple wavelengths ought to suffice), then look for the distortion. If it disappears using this method, then I'm going to bet you weren't keeping up with the buffers as they were filling before.


On 12/30/2004 10:01:24 AM, cswiger wrote:
Gang - can anybody shed some light on my problem, it's a very
simple script that has me pulling out hair.   The situation is
laid out on this page:


and is why is the real world signal all broken up while the
software generated signal perfect?  The signal generator and
ADC are all working fine! I must be overlooking something.

Any tips appreciated.


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