Thanks! So I set scaler to an appropriate value that ceil is not
effected my data. But in Gnuradio I can not find an easy convert solution.
So I do test and error to find a solution.
On Sun, Jul 3, 2022 at 1:44 AM Nikos Balkanas <nbalka...@gmail.com> wrote:
> 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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