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Discussion Groups | Analog Devices DSPs | AW: optimised autocorrelation
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
AW: optimised autocorrelation - Jens Michaelsen - Sep 12 19:44:00 2003
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Right, the FFT routines are quite good. We process 1024 samples like this: - Acor(); - FFT(); - search for maximum(); - ... - done There is good signal from about 500 Hz up to some kHz. There is all kind of noise. Down from near DC up to several kHz. To name it would write NOISE. Wind, gear, mud, all these things. There is something called "fast convolution", but not shure if this will help me. Did not find much about it. What I found did not help so far. Is there math-man that can give some help? Did not find the gap that helps me doing a FFT to kick out the acorr(). If I do a FFT only, without acorr() I don't even see the signal, no way to find any maximum via software. ThanX for your patience :) Jens Michaelsen -----Ursprüngliche Nachricht----- Von: oo.com [mailto: oups.yahoo.com]Im Auftrag von hemant ramdasi Gesendet: Freitag, 12. September 2003 19:35 An: Cc: Betreff: Re: [adsp] optimised autocorrelation Why not try autocorrelation using FFT. ADI provided FFT routines are very much efficient and will save computations quite a lot. I have been able to reduce the cycles by this method. regards hemant |
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