Hi Vladimir, because you're mentioning "float", what you're referring is the data type on the host, ie. what UHD converts the data that comes in through USB to.
On the USB cable itself, there's already signed 16 bit integer complex, by default. Yes, you can further reduce that (change the "OTW" data format to sc12, sc8, whatever your device supports), but it of course reduces dynamic range / increases quantization noise, so you normally wouldn't want to do that. You do that by using an appropriate stream_args_t [1] when getting the RX streamer. In GNU Radio Companion, you simply select the other OTW format in the drop down menu labeled "Wire Format". Best regards, Marcus [1]https://files.ettus.com/manual/structuhd_1_1stream__args__t.html On 08/29/2017 08:08 PM, Vladimir Rytikov wrote: > will it help to change data type from float to complex16 to reduce > data rate ? > > On Tue, Aug 29, 2017 at 11:02 AM, Marcus Müller via USRP-users > <usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote: > > 20 MS/s is already 80 MB/s, which is 0.64 Gb/s. It's not that > little data to shuffle around! So you already need a halfway > decent USB3 setup to do that. Also, your computer mustn't be very > slow. What is your computer, in fact? > > Best regards, > > Marcus > > > On 08/29/2017 05:07 PM, Cho, Daniel J (332C) via USRP-users wrote: >> >> Hello – >> >> >> >> I am having issues with overflow with the USRP B210 at 20 MSPS. >> I am using a LiveUSB that has Ubuntu and Gnuradio in it. The >> gnuradio flow chart is just the USRP source going into a file >> sink with the destination being just /dev/null. Since the data >> is going to /dev/null, there should be no reason for an overflow >> to occur but for some reason, I get one or two about every 10 >> seconds. >> >> >> >> Thanks, >> >> Daniel Cho >> >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com> >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com> > _______________________________________________ USRP-users mailing > list USRP-users@lists.ettus.com > <mailto:USRP-users@lists.ettus.com> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com> >
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