I want to use COMPLEX_INT16 in hopes of generating non-normalized fixed point data using UHD. I ultimately want to send this data over to the DSP on the E100, if I receive the data as COMPLEX_FLOAT32 then UHD is performing
fixed-point -> floating point and I will be performing floating-point -> fixed-point -> floating-point feeding into the FPGA. Ultimately I want FPGA ->fixed-point -> DSP -> fixed-point -> FPGA instead of FPGA ->fixed-point -> floating-point -> fixed_point -> DSP -> fixed-point -> floating-point -> fixed-point -> FPGA however in my flowgraph I want to be able to use gr.probe_avg_mag_sqrd() and a scalar multiples before feeding into the DSP and it fails when I use COMPLEX_INT16 because of data type confusion al fayez -----Original Message----- From: Josh Blum <[email protected]> To: discuss-gnuradio <[email protected]> Sent: Mon, Sep 12, 2011 1:18 pm Subject: Re: [Discuss-gnuradio] Converting complex-short to complex-float with UHD On 09/12/2011 10:00 AM, Almohanad Fayez wrote: > > I can't seem to find a direct way of typcasting COMPLEX_INT16 using > gr-uhd as complex_float. It seems that gnuradio assumes that a > complex type is composed of floats by default which causes issues > when I'm using gr-uhd, is there a direct way to do complex_short to > complex_float conversion or should I just make a custom block for > that? thanks. > The output signature for COMPLEX_INT16 is a vector of shorts length 2. You can covert this to complex float with a vector_to_stream block, and then a ishort_to_complex block. BTW, if you want complex floats, it makes way more sense to just use COMPLEX_FLOAT32. The real use of COMPLEX_INT16 is if you have a block that produces or consumes complex shorts. Otherwise its just extra overhead. -josh _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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