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Re: [Discuss-gnuradio] Strange behavior in digital benchmark examples

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Strange behavior in digital benchmark examples
Date: Fri, 04 Nov 2011 14:41:16 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1

On 11/04/2011 01:55 PM, Jordan Otomo wrote:
> I think the problematic block might be the FLL used in the PSK
> demodulator.  I haven't looked into the issue very deeply, but I have
> confirmed that given the same input parameters, the FLL from 3.4.2
> works fine, while the 3.5.0 version causes a lot of overruns.

Thanks, I confirmed that the fll band edge filter is the culprit. The
following diff (removing the bandedge) makes may loopback example far
more responsive:

diff --git a/gr-digital/python/generic_mod_demod.py
index ae876e1..cf2d684 100644
--- a/gr-digital/python/generic_mod_demod.py
+++ b/gr-digital/python/generic_mod_demod.py
@@ -303,7 +303,7 @@ class generic_demod(gr.hier_block2):

         # Connect and Initialize base class
-        blocks = [self, self.agc, self.freq_recov,
+        blocks = [self, self.agc,
                   self.time_recov, self.receiver]
         if differential:


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