I found a fantastic book on DSP. I am about 7 chapters in, and can say tha= t this book has probably the best explanation of signal statistics and analysis I have ever seen.=20 The book is at http://www.dspguide.com/ Warning! Anybody going to the link may be trapped in late-night reading, forgetting to eat, sleep, shower, etc. Enjoy! Sergey Dryga --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .