Contact Mic Aug 29,2003
Making your own Contact Mic from Radio Shack parts...
Contact Mic Preamp Aug 29,2003
Making a preamp for a contact mic...
PIC Sound Jan 4,2004
Here's an algorithm for digitizing and playing back sound on a PIC.
Speakjet Speech synthesis chip Feb 25,2004
The Speakjet chip looks interesting; it can synthesize speech allophones, do some interesting sound effects, and more. It's also available from Acroname.
VoiceDirect Aug 29,2003
VoiceDirect Speech Recognition kit - embedded speech recognition...