Sean Schouten wrote: > In your first reply you stated that a phase shift does NOT change the > shape of a sine wave. I thought that some one told me that that was > the case, but the more I think of it, the less logical it sounds. ALL linear filters will preserve the shape of a sine wave, although they can alter the amplitude and phase. ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist