I work in pathological speech processing/synthesis so I'm unfortunately familiar with your father's position. It really sucks that these people didn't know that archiving their voice would've been useful. I hear snippets that people manage to glean from family videos right after listening to their current voices and it makes me really sad.
On the upside, your father can choose any celebrity he wants to voice him! Tons of celeb data is publicly available (VoxCeleb 1 & 2).
Are there any simple howtos anywhere which describes the process in as simple terms as possible? Without knowing the cool toolkits du jour.
Something like:
- Download these texts
- Record in WAV at least 48 kHz
- Record each line in a separate file.
- Do 3 takes of each line: flat, happy, despair
Maybe even a minimal set and a full set depending on how much effort you are willing to put in.
A plain description on how to capture a raw base which within reason and technology could be used as a baseline for the most common toolkits.
I have myself looked into this (for fun) but I felt I needed a very good understanding of the toolkits before even starting to feed in data. And for my admittedly unimportant use it seemed a huge investment to create a corpus I was not even confident would work. I ended up taking the low road and used an existing voice.
I recall that the "say" program on the SGI from the mid 90's was approximately Hawking's voice. Hawking gave his speech for the Whitehouse Millennium Lecture at SGI also, and while I wasn't able to attend I found the transcript of it and fed it in there... there were some jokes that he had that only really came through with the intonation and pacing of a voice synth -- its the ultimate dead pan voice.
> “It is the best I have heard, although it gives me an accent that has been described variously as Scandinavian, American or Scottish.”
> ...
> “It has become my trademark and I wouldn’t change it for a more natural voice with a British accent.
> “I am told that children who need a computer voice want one like mine.”
Somewhere, I recall a NOVA(?) program from the mid 80s where it showed him using the speech synthesizer and the thing that he said with it that still sticks in my mind is the "please excuse my American accent". In later years he was given the opportunity to upgrade it to a more natural sounding voice - but that voice was his.
Near the end of his life, his original voice computer started to fall apart. He managed to get in touch with the people who wrote the software, who started a mad scramble to find source, and ultimately ended up emulating the whole setup on a Pi.
On the upside, your father can choose any celebrity he wants to voice him! Tons of celeb data is publicly available (VoxCeleb 1 & 2).