On Sat, 29 Sep 2007 18:56:26 -0000, Roelof Bakker wrote: >Two signals 40 Hz apart are much easier seperated at a pitch of 400 Hz than >at a pitch of 800 Hz. At 800 Hz the difference is 5%. At 400Hz it is 10 %. >This is the way our BSP (biological signal processor) handles it. Yes, this is very good advice. Jim Brown K9YC