John Deters <jad@dsddhc.com> writes:

On Wed, 17 Jul 1996, Jerome Tan wrote:

...

Does anyone know how to make a home-made telephone voice changer?

Well, if you've got your sound card in your computer, if you download Speak Freely (from http://www.fourmilab.ch) and simultaneously turn on LPC-10 compression along with simple compression, I've found my voice comes out more like Robbie the Robot than John Deters. It's an interesting feature of the LPC-10 compression that as it removes redundancy from the transmission that it removes the "human identity" from it as well. There's got to be a moral to that story somewhere (especially since the NSA developed the LPC-10 algorithm).

You can find voicw changers and a lot of other fun toys in the Edge Company catalog (+1 800 732 9976). They have other electronics, guns, knives, swords, cross-bows, what have you. No homicidal maniac should be without their catalog. It would be an interesting EE project to implement a voice changer in software using a PC with a sound / phone board. --- Dr.Dimitri Vulis KOTM Brighton Beach Boardwalk BBS, Forest Hills, N.Y.: +1-718-261-2013, 14.4Kbps