I regret that I have to suspend feedback from this site as it is currently being blitzed with junk mail. This is costing me time and money as I have a slow (by current standards) dial-up connection.
I will not be checking mail sent to the "dsptutor" address in the meantime. I hope to restore the normal feedback form page at a later date.
If you wish to contact me, please send mail to iain at xunil dot uklinux dot net. (Substitute the appropriate characters for "at" and "dot" in the usual way.)