On Fri, Jan 6, 2012 at 1:13 PM, Mark Kahrs <mark.kahrs at gmail.com> wrote:
I grabbed a copy of a free (!) publication from the
Cryptologic Museum
entitled "The start of the Digital Revolution: SIGSALY - Secure Digital
Voice Communications in World War II". It mentions that you can visit the
library and look at "The Green Hornet... America's Unbreakable Code for
Secret Telephony" -- privately published in 1999 by D. E. Mitchell. It
says it is very complete.
There's a bit on SIGSALY on this author's amusingly titled history of the
vocoder:
http://howtowreckanicebeach.com/
(Link to authors blog with an entry on the topic)