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<p><div class="gmail_extra">Matt,<br><br>If the FSK4 demod wasn't working properly, would we still be getting "good looking" values out of the dibits output of the OP25 block? We're getting the "four straight lines" at -3,-1,+1,+3 but still not audio out.<br>
<br>Thanks,<br><br>Andy<br><br><br><div class="gmail_quote">On Thu, Apr 26, 2012 at 10:06 AM, Matt Robert <span dir="ltr"><<a href="mailto:matt.robert80@yahoo.com" target="_blank">matt.robert80@yahoo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left:1px #ccc solid;">
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<p></p><div style="font-size:12pt;font-family:times new roman,new york,times,serif;"><div><span>Hi Bob,</span></div><div><span><br></span></div><div><span>Its more than likely a result of a bad signal. The FSK4 demod tends to output zeros when it loses sync which is why the DUID is erroneously coming up as 0x00.</span></div>
<div><span><br></span></div><div><span>LDU1/2 are the two types of voice frames. LDU1 has signalling data embedded and LDU2 has encryption sync data embedded.</span></div><div><span><br></span></div><div><span style="font-size:12pt;">The kludge diff posted below will work - but only for valid frames with a corrupt DUID value.</span><br>
</div><div><br></div><div>I'm sure the root cause is the FSK4 demod isn't locking properly and causing a bad DUID value to be outputted. I have seen similar behaviour in other areas of OP25 - for example I was looking at the IV/MI value (72 bits) on a local
P25 system here. Whenever the demodulator ran out of talent, it would output steams of constant zeros.</div><div><br></div><div>Ohio MARCS is a Type 2 Smartzone Omnilink System with CAI compatible ASTRO voice channels - so its essentially P25 compatible. The P25 CAI spec was based on the ASTRO CAI from the same era, so its essentially the same thing.</div>
<div><br></div><div>Is the system running any form of simulcasting? </div><div><br></div><div>Cheers,</div><div><span style="font-size:12pt;">Matt</span></div> <div style="font-size:12pt;font-family:'times new roman','new york',times,serif;">
<div style="font-size:12pt;font-family:'times new roman','new york',times,serif;"> <div dir="ltr"> <font face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> rrgsti <<a href="mailto:bobrich@gmail.com" target="_blank">bobrich@gmail.com</a>><br>
<b><span style="font-weight:bold;">To:</span></b> <a href="mailto:op25-dev@yahoogroups.com" target="_blank">op25-dev@yahoogroups.com</a> <br> <b><span style="font-weight:bold;">Sent:</span></b> Thursday, 26 April 2012 10:59 PM<br>
<b><span style="font-weight:bold;">Subject:</span></b> [op25-dev] Re: OP25 GRC - Almost but not quite working<br> </font> </div><div><div class="h5"> <br><div>
<div>
<span> </span>
<div>
<div>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 rel="nofollow" href="http://s3.amazonaws.com/public-xrp/p25.iq.bz2" target="_blank">http://s3.amazonaws.com/public-xrp/p25.iq.bz2</a><br>
<a rel="nofollow" href="http://s3.amazonaws.com/public-xrp/p25.wav" target="_blank">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 rel="nofollow" href="mailto:op25-dev%40yahoogroups.com" target="_blank">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 rel="nofollow" href="mailto:op25-dev%40yahoogroups.com" target="_blank">op25-dev@yahoogroups.com</a> [mailto:<a rel="nofollow" href="mailto:op25-dev%40yahoogroups.com" target="_blank">op25-dev@yahoogroups.com</a>] *On<br>
> > Behalf Of *Andy Knitt<br>
> > *Sent:* Tuesday, 24 April 2012 12:45 PM<br>
> > *To:* <a rel="nofollow" href="mailto:op25-dev%40yahoogroups.com" target="_blank">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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