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Summary of change:
wavelet transform is fast and precise math algorithm without extra-HW(such as tpic8101) for knock and misfire detection. http://www.icsv12.ist.utl.pt/papers/paper.php?id=717 http://www.freepatentsonline.com/6546328.html http://www.freepatentsonline.com/EP1221603.html http://www.sae.org/technical/papers/ground_vehicle/SI - a lot of tech papers (including about wavelets in knock-sensing), but not free.
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