Hey Theo, it is nice to see interest in FPGAs here. I have worked with FPGAs for some years now and always wanted to use it for audio processing. Because the FFT is indeed really fast I thought about using it for real-time pitch detection. The Zynq platform is ideal because you can use Linux and the FPGA. I implemented some basic (multi)pitch detection algorithms on it using an accelerated FFT on the FPGA.
I am also very interested what others think about it. What do you think can be done with such a fast FFT? Additionally, other processing steps, like windowing, or the calculation of the power spectrum can be done on the FPGA with only little impact on latency. Best regards, Matthias Am 21.09.2015 um 17:14 schrieb Theo Verelst: > I've tried to compose this mail from scratch, so there should be no > strange (in my mail program) invisible tags left. > > Anyhow, I was playing around a bit with an FPGA programmer tool called > Vivado (from Xilinx), for use with the cheap ($99 and up) Zynq based > Parallella board, and looked at he available freely usably IP blocks > that can be automatically designed with it, and found this FFT > computation block: > > > http://www.theover.org/Musicdspexas/Screenshot_from_2015-09-21_16:57:02c.gif > > > which in the parameters on the other pages is set to 32 bit floating > point as input format (it automatically picks 24 or 25 bits for phase > data) and at a clock frequency available on the cheap little boards > should have a 1024 sized FFT computation done in under 10 uS, which is > pretty fast. > > Now, these blocks aren't very easy to interface, but the fun of the > (freely downloadable and usable) setup in this design package is that > you can simply route wires between correspondign size inputs and > outputs, so you could also make an audio frequency flow graph that can > than be hardware compiled to fit in the FPGA part of the Zynq chip, > addressable by the 2 ARM cores. > > What would you do with that ? > > T.V. > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
