1985 digital sound voice synthesizer demo AN ORIGINAL DISK

[ipadloops]

I remember in the 80s, when I was in sixth grade, a short digital recording of The Who's Baba O'Riley floating around the BBS. I played it on my Apple IIe all the time. Was that you who sent it out? At the time this was a really amazing thing.

[evansdm2008]

You did it by tuning a radio receiver into a frequency range corresponding to the machine's cycles

[soniccolorsboy]

can u get on u tube??

[amithacker1]

LOL what a computer

[adriankeibord2]

old

[EA78751]

super cool!

[jci10]

Bah! and piffle. My 1Mhz, 4kb Vic-20 can outdo this. Do a youtube search for "Robotic Liberation" and see what real old-skool asm speech synthesis computing is boyz & girlies...

[storerestore]

At least the VIC-20 has somewhat useful sound production hardware, and there's no way you'd hear what they were saying in Robotic Liberation without the subtitles.

[MalaTemporaCurrunt]

oingo boingo !

[CoolDudeClem]

What type of computer is this running on?

[progress2007]

that would be an Apple //c yay! :)

[tubemaster2703]

@CoolDudeClem Looks like an apple 2.

[JGevaryahu]

Also is there anywhere i can get a copy of the disk image of this? I'd love to try it out!

[JGevaryahu]

How exactly does this work? I assume you're using prerecorded phoneme or diphone samples, and one of the pulse-width modulations mentioned on wikipedia's "Pulse width modulation" article or a variant of them in order to get the output out of the 1-bit speaker.

Correct me if I'm wrong please!

[Amishman35]

I'm thinking what you did was tell the music/beeper chip to produce a low-frequency square wave near DC and then wiggle the volume level in a for/next loop with 1 bit DATA statements to make it sound like digital sound.

[VironCybernet]

Interesting guess, vaguely close. The disk runs on any Apple II, which can only make click sounds by using PEEK(-16336) to click the speaker. Very primitive! There are no analog to digital to analog converters involved with this at all!

(And at only around 1000 clicks per second it also violates the Nyquist theorem. 2 songs and 3 TTS voices on a 128K diskette.)

P.S. Your stuff is interesting. Didn't you make record grooves on CD's before I did?

[Funmichi]

how is a voice synthesizer made or working?