On Sat, Jul 2, 2022 at 6:54 PM Marcus D Leech <patchvonbr...@gmail.com> wrote:
>
> The convention in the UHD and GnuRadio universe is that floats are scaled
> into {-1.0,+1.0}.
>
> If you setup your streamer to use complex float CPU format and sc16 wire
> format you just need to scale your complex floats appropriately.
Just to elaborate on this a bit. If your data is large enough (>>1)
then +- 1 won't make any difference...
If it is (< 1) then it will be a big problem. Scale accordingly:)
You can use either ceil or floor. Same error:)
Nikos
>
> Sent from my iPhone
>
> > On Jul 2, 2022, at 10:22 AM, Nikos Balkanas <nbalka...@gmail.com> wrote:
> >
> > Hi,
> >
> > I don't know volk_32fc_convert_16 ic. Dunno if it converts between big
> > and little indians:(
> > When converting a float to int, you always have to ceil or floor the float.
> > Ceil sounds as good as any. You can easily change that to floor if you
> > run into problems.
> > Since clibs le32to* take ints as arguments, I would first convert
> > float32 to int32 from gnuradio save to file, and then worry about
> > the indians when importing to uhd...
> >
> > HTH
> > Nikos
> >
> >> On Fri, Jul 1, 2022 at 8:42 AM sp h <stackprogra...@gmail.com> wrote:
> >>
> >> I recorded a complex signal file, I did it with HackRFONE, For sending on
> >> USRP I want to use the int16 option as input, My question is how can
> >> convert a complex float 32 signal to complex int 16 for USRP?
> >> what's the relation between complex float 32 and complex int 32 in USRP?
> >> I know that in USRP numbers are in format complex int 16 and big-endian
> >> and in Gnuradio numbers in format complex float 32 and little-endian...
> >> https://files.ettus.com/manual/page_converters.html
> >> I used volk lib but the float that I entered as input, is ceiled to bigger
> >> integers. Is this a method valid for converting signals...?Or my data will
> >> be corrupt!!!
> >> Thanks in advance.
> >>
> >>
> >>> lv_16sc_t* outputVector;
> >>>
> >>> lv_32fc_t* inputVector;
> >>>
> >>> inputVector->real(25.55);
> >>>
> >>> inputVector->imag(45);
> >>>
> >>> volk_32fc_convert_16ic(outputVector,inputVector,32);
> >>>
> >>> qDebug()<<outputVector->real()<<"-----";
> >>
> >>
> >> The output:
> >>>
> >>> 26 -----
> >>
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