To Bill (and Joe), It just occurred to me that I could multicast my receiver output to you in the frequency domain. UDP already provides the necessary framing. We just define that as a new RTP "codec type".
I use fast convolution with overlap-and-save for filtering, so as long as I tell you the parameters (i.e, FFT block size and the overlap amount) I could just give you the frequency domain signal before I'd ordinarily perform the IFFT. This would save me the IFFT (though I'd probably do it anyway just so I could listen). With the right blocksize, it might also save you an FFT. To be honest, at that point there wouldn't be much left for my receiver to do. Or you could just read my raw SDR I/Q streams directly... We could also reduce the bandwidth by just truncating the frequency information, though I'd have to apply a low pass decimation filter to avoid aliasing. I use Kaiser windowing for pretty much everything; I really like its tuning knob to trade transition sharpness against stopband sidelobes. (I also worked with Jim Kaiser at Bellcore way back in the 1980s.) Phil ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
