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Thanks Mike, appreciate that info. Been playing with IRIS, and its not quiet easy to use, but it is powerful. I am sure David did a guide on it a while back, but I can not get the link to work.
Wavelets, as little of what I understand are supposed to give you a sense of Time in the Frequency spectrum of a signal. Not just what frequencies are there but when they are there. This helps with signals that are finite in length. I never studied this as it was only coming out when I finished up at uni.
Regards
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