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Re: [Discuss-gnuradio] A medley of questions

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] A medley of questions
Date: Sat, 17 Mar 2007 13:12:28 -0700
User-agent: Mutt/1.5.9i

On Sat, Mar 17, 2007 at 08:00:59AM -0700, Mike Garcia wrote:
> Thanks Eric. That makes sense. I'm still learning about gnuradio so excuse
> my naivete. Could the distortion be cause by the CIC filters? I understand a
> CIC filter needs some amount of bit growth. If the LSBs are truncated
> instead, then that amounts to adding noise to the system. This may be
> unavoidable but might explain the distortion you're seeing.
> Mike

I don't think it's a problem in the CIC.  They have enough width to
accomodate the maximum decimation (usrp/fpga/sdr_lib/cic_decim.v)

I'm waiting on hearing the results of low pass filtering the "perfect
samples" without decimation, and seeing if the problem still exists.


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