On 20/08/2011 10:32, Michael Watterson wrote: > The only way to "measure" THD is to measure noise, then measure THD+n > and then make assumptions I meant easily. There are ways to measure it on its own probably. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .