Bell Labs Speech Synth (Score 1)

This isn't a direct answer, however its of interest to people interested in this. Sadly however some of the links are broken or missing information. A member of the SynthDIY mailing list bought a Bell Labs Speech Board and put some info up here : http://www.oldcrows.net/~patchell/voicesynth/voicesynth.html Sadly the link to the schematic is broken but I've emailed to see if he can fix it. Jim also did some experiments and eventually made an insanely complex vocal filter board : http://www.oldcrows.net/~patchell/vocalfilter/vocalfilter.html He also did a board layout and sold some boards for a vocal filter : http://www.oldcrows.net/~patchell/synthmodules/vocalfilter.html I rather expect that the Philips COFFEE machine is closely related to these sorts of circuits. I can't find a link right now, but there was an S-100 phonetic speech synth card that contained a bunch of ROMs and a complete set of vocal filters. It didn't use one of the several LSI chips that were around in the 70s/80s ( Votrax and friends ).