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<p>Quick update from my end.<br>
<br>
It looks like every frame coming out of the fsk4 demodulator (I'm assuming, still a n00b here) is marked with a 'duid' of 0x0. Consequently, when data_unit.cc initializes a new data_unit from the frame, it is always creating it as an HDU (P25 header) type. This then prevents the IMBE decoder from being executed b/c it's not a voice data unit type (LDU1/LDU2 (no idea what these mean)).<br>
<br>
I figured maybe it has something to do with our system (Ohio MARCS) not being full P25 compliant and not including metadata of any sort, so I just made the following change to data_unit.cc and re-ran it:<br>
<br>
--- op25-orig/blocks/src/lib/data_unit.cc 2012-04-24 10:31:29.139694592 -0400<br>
+++ op25/blocks/src/lib/data_unit.cc 2012-04-26 08:12:35.183962129 -0400<br>
@@ -39,7 +39,8 @@<br>
uint8_t duid = extract(frame_body, 60, 64);<br>
switch(duid) {<br>
case 0x0:<br>
- d = data_unit_sptr(new hdu(frame_body));<br>
+ //d = data_unit_sptr(new hdu(frame_body));<br>
+ d = data_unit_sptr(new ldu1(frame_body));<br>
break;<br>
case 0x3:<br>
d = data_unit_sptr(new tdu(frame_body, false));<br>
<br>
This seemed to sort of work as I now get rather garbled, but intelligible, audio from the decoder.<br>
<br>
I've uploaded the baseband capture (1Msps) and resulting audio .wav file that I get at the following URLS:<br>
<br>
<a href="http://s3.amazonaws.com/public-xrp/p25.iq.bz2">http://s3.amazonaws.com/public-xrp/p25.iq.bz2</a><br>
<a href="http://s3.amazonaws.com/public-xrp/p25.wav">http://s3.amazonaws.com/public-xrp/p25.wav</a><br>
<br>
Not sure if this is of any use, but it is encouraging to hear voices at least. :)<br>
<br>
Thanks!<br>
<br>
Bob<br>
<br>
--- In <a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a>, Andy Knitt <andyknitt@...> wrote:<br>
><br>
> It looks like imbe_decoder_factory.cc in OP25 defaults to<br>
> 'software_imbe_decoder'. I manually changed the IMBE environment variable<br>
> to "soft" and confirmed it with printenv, but I'm still getting a flat line<br>
> at the output of the OP25 block. Any other ideas?<br>
> <br>
> Thanks,<br>
> <br>
> Andy<br>
> <br>
> On Mon, Apr 23, 2012 at 11:47 PM, Balint <balint256@...> wrote:<br>
> <br>
> > **<br>
> ><br>
> ><br>
> > I *still* haven't checked out the latest code, but in my old code the<br>
> > default voice frame output was (null?).****<br>
> ><br>
> > There are options for file output, null, external (hardware) decoder and<br>
> > internal decoder. You used to be able to spec this on the command line as<br>
> > an environment variable:****<br>
> ><br>
> > export IMBE=soft****<br>
> ><br>
> > I changed my default to be the internal decoder (see<br>
> > `imbe_decoder_factory.cc').****<br>
> ><br>
> > ** **<br>
> ><br>
> > *From:* <a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a> [mailto:<a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a>] *On<br>
> > Behalf Of *Andy Knitt<br>
> > *Sent:* Tuesday, 24 April 2012 12:45 PM<br>
> > *To:* <a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a><br>
> > *Subject:* [op25-dev] OP25 GRC - Almost but not quite working****<br>
> ><br>
> > ** **<br>
> ><br>
> > ****<br>
> ><br>
> > I have the OP25 GRC demo that Balint provided up and running.<br>
> > Everything seems to working except I'm not getting any audio out of<br>
> > the OP25 block. I'm getting the "four line" output from the dibit<br>
> > output port when there is traffic on the channel, and the autotune<br>
> > output is outputting data. However, no audio. I put a scope on the<br>
> > audio output and it's a flat line at zero, even when the dibit output<br>
> > is "four lines". Any tips on how to further troubleshoot?<br>
> ><br>
> > Thanks,<br>
> ><br>
> > Andy****<br>
> ><br>
> > ****<br>
> ><br>
> > <br>
> ><br>
><br>
<br>
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