hye i am new to gnu radio i want guidance about that while receiving two channels how can i separate those channels and records their audio in their respective files simultaneously..
On Mon, Jan 20, 2020 at 10:02 PM <discuss-gnuradio-requ...@gnu.org> wrote: > Send Discuss-gnuradio mailing list submissions to > discuss-gnuradio@gnu.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > or, via email, send a message with subject or body 'help' to > discuss-gnuradio-requ...@gnu.org > > You can reach the person managing the list at > discuss-gnuradio-ow...@gnu.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Discuss-gnuradio digest..." > > > Today's Topics: > > 1. GR 3.8 overflow, dropped samples with 2 channels from B210 > (Michael Wentz) > 2. Constellation script (michel slepoukha) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 19 Jan 2020 14:02:36 -0500 > From: Michael Wentz <mchlw...@gmail.com> > To: discuss-gnuradio@gnu.org > Subject: GR 3.8 overflow, dropped samples with 2 channels from B210 > Message-ID: > <CAFTrPL0dTCy-B5t-m2M= > wj-jwtitd6e+yoomzrnzmt+ebt2...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi, > > I recently updated to GNU Radio 3.8 and noticed some code that receives 2 > channels from a B210 is now always printing a single overflow (O) followed > by two drops (DD) right after the flowgraph starts. This happens regardless > of the sample rate and only when using 2 channels. It also doesn't happen > outside of GNU Radio; the UHD examples benchmark_rate and rx_multi_samples > never show overflows or drops. I've tested under macOS 10.14 and RHEL 7, > both with UHD 3.15. I also tried downgrading to GNU Radio to 3.7.13.5 and > problem goes away, so it seems like a GR issue and not UHD. > > In debugging with a file meta sink I've found that the first header for > both channels always shows 38760 items before it gets a new tag. I did some > more testing with a very simple flowgraph of just a USRP source and null > sink. With 1 channel I can stream 20 MSPS without problems. With 2 channels > I tried rates 250 KSPS to 4 MSPS and saw the same behavior every time. > > I thought that maybe the device was starting to stream before the flowgraph > was ready, so tried setting a start time several seconds in the future, but > that didn't make a difference. I also tried resetting the B210 and the host > USB subsystem. > > Any idea what could be going on? A snippet of how the 2 channel B210 is set > up by GRC is below. > > Thanks, > Michael > > --- > > self.uhd_usrp_source_0 = uhd.usrp_source( > ",".join(("", "")), > uhd.stream_args( > cpu_format="sc16", > args='', > channels=[0,1], > ), > ) > self.uhd_usrp_source_0.set_center_freq(1e9, 0) > self.uhd_usrp_source_0.set_gain(0, 0) > self.uhd_usrp_source_0.set_antenna('RX2', 0) > self.uhd_usrp_source_0.set_center_freq(0, 1) > self.uhd_usrp_source_0.set_gain(0, 1) > self.uhd_usrp_source_0.set_antenna('RX2', 1) > self.uhd_usrp_source_0.set_samp_rate(1e6) > self.uhd_usrp_source_0.set_time_unknown_pps(uhd.time_spec()) > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20200119/e7d3676e/attachment.html > > > > ------------------------------ > > Message: 2 > Date: Mon, 20 Jan 2020 17:41:18 +0100 > From: michel slepoukha <f...@orange.fr> > To: discuss-gnuradio@gnu.org > Subject: Constellation script > Message-ID: <5275fd3e-5b10-7761-47f8-df268dc3d...@orange.fr> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > Hello all! > I designed in 2018 the DMR-C4FM relay from Albi (Tarn), F5ZLH > it works… > Well, not that good, because we noticed a poor signal quality: > > > with the constellation, on a portable equipment such as the Rpi 4. we > will beable to adjust the relay settings > And there only GNURadio is installed correctly and worked perfectly with > an RTL-SDR key. > But most of the flow chart examples use logical signal sources and if > some of them have an RTL-SDR key as input, they are either incomplete or > with errors (wonder if this is not done expressly?) . And above all, no > script linked to the flow chart concerned. > So, I can only turn to the competence of your team to finally have this > script validated. > Configuration is simple: SDR-RTL → constellation > With thanks for help > Mike > > -- > Michel SLEPOUKHA F5ZZ > (FR5FI - TU2DD - 6W8IY) > F5ZZ-10 JN13AV > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20200120/3167e1f2/attachment.html > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: jdmpkfahhgfcffpf.png > Type: image/png > Size: 36070 bytes > Desc: not available > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20200120/3167e1f2/attachment.png > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > ------------------------------ > > End of Discuss-gnuradio Digest, Vol 207, Issue 21 > ************************************************* >
