Following our lecture and lab on the vocoder, you might interest you to read this interview and postscript on the use of the vocoder in the music of Wendy Carlos (Switched on Bach, Soundtrack to "A ClockworkOrange").

http://www.wendycarlos.com/vocoders.html

The page mentions Homer Dudley and several other people and technologies that we discussed in class.  Be sure to have a look at the photos of the Moog modular version of the vocoder found here:

http://www.wendycarlos.com/photos.html#synth

"907 fixed filter bank with modified output section, acts as spectrum encoder for vocoder; 10 pairs of 912 envelope followers and 902 VCAs for vocoding each of ten channels".

If you don't know Wendy Carlos's music, we'll be discussing it  a little in lecture.  See her pieces "Timesteps" and "March from a Clockwork Orange" on the "Clockwork Orange" movie soundtrack.