Ask Lemmy

I'm picking nits, but Impossible Mission didn't use voice synthesis (where a computer creates the voice sounds from scratch.) It was using really low-fi by modern standards (but amazing for the time) recordings of actual speech provided by an unknown actor.

From this interview with the programmer:

The speech in the game was real, digitized speech. The performances were provided by Electronic Speech Systems, who also provided the software for reproducing the speech on the Commodore 64. I told them what I wanted the game to say, and when they asked me what kind of voice I had in mind, I said I was imagining a fiftyish English guy, like a James Bond villain. I was told that they happened to have such a person on their staff, so, instead of hiring an actor, they let him take a whack at it, and I thought he was just fine. I never met the guy who provided the voice, but, to my knowledge, the recordings were not altered or processed, apart from being digitized. It is certainly possible, though, that Electronic Speech Systems could have tweaked them without my knowledge. There are no other digitized sounds in the game.

Heh, I specifically came here to post Impossible Mission!