On Fri, Jun 09, 2006 at 03:58:58PM -0700, Johnathan Corgan wrote: > Eric Blossom wrote: > > The application here is to multiply an incoming stream of floats by an > analysis window and pass it off for further vector processing, and > ultimately send it through an FFT block. For example, google WOLA DFT > or check this link: > > http://www.epn-online.com/page/15837/efficient-digital-channelisers-for-fpgas-mixed-radix-fft-designs.html > > and specifically the diagram here: > > > http://www.epn-online.com/common/inc/loadimage.php?name=33/10/G-09946C.JPG
OK. Here's how I think you could do it without any new code (admittedly it's a bit ugly): Use vector_source_f to provide your window, and set the repeat argument to True. Before using stream_to_vector on the data, mulitply by the repeating window using gr.multiply_ff (or _cc as the case may be) The run the output of that into gr.stream_to_vector > > One idea has been to use the "Universal function" (ufunc) idea from > > NumPy and Numeric: > > Yes, your example would work nicely for what I think is needed. > > > Are you interested in building something along these lines? > > It would be a *very* useful contribution. > > I might be interested but every time I try to understand what you're > doing with SWIG to bridge the C++ and Python worlds, I get a serious > migraine (that's over and above the minor headache stemming from > deciphering the autotools) :-) Oh come on, it's not that hairy ;) Mostly the SWIG .i file is a subset of the .h file. Just add the GNURADIO_SWIG_BLOCK_MAGIC call at the top ;) As long as your constructor and methods arguments are ints, longs, floats, gr_complex or std::vector<foo> of them, pretty much everything just works. If you've got questions, just ask. Regarding the autotools: Mostly you've just got to add 3 lines to the existing Makefile.am. One each for the .h, .cc and .i file. There's the also the "How to write a block" article. It walks you through building an extension outside of gnuradio-core. http://www.gnu.org/software/gnuradio/doc/howto-write-a-block.html > -Johnathan, AE6HO Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
