Marcus,
I see your point. In GNU Radio flow chart when you instantiate USRP source
- you can set out put datatype. The default is complex float - two floats
per sample which is 4*2=8 bytes. you mentioned on USB wire we got 2*2 bytes
per sample = 4 bytes per sample. so we got double data rate
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> 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
Hi Vladimir,
exactly! So, if you directly write to a file from the USRP Source, then
don't use float – there's no more information in the floating point
numbers than in the 16 bit integers. But if you need to do mathematical
operations on the samples, it's usually helpful to have them in float.
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"
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)
On 08/29/2017 11:22 AM, Michael Cameron via USRP-users wrote:
All,
Can someone point me to a good repo for sample GNURadio-Ettus Research
flowgraphs? (FM radio receivers, AM receivers, GSM stack, OFDM
receivers, etc). Is there such a thing or are these examples just
found here and there
On 08/29/2017 11:07 AM, 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
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
Sample rate is 625 kHz and usb3.0 is internal intel controller.
The problem with uhd_rx_metadata_error_code_timeout error occurs both on the
desktop and laptop.
By the way, I did not notice such a problem in single-channel mode.
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