[sdiy] Has anyone built a voice pitch tracker?

[Ingo Debus]

Jaroslav Lukesh wrote:
 > | It's nothing fancy, on the analog side a preamp, a low-pass 
filter (fc
 > | about the highest frequency a flute can produce) and a 7413 schmitt
 > | trigger. On the digital side there's a processor with timer in 
capture
 > | mode. On every active transition of the schmitt trigger, the timer
 > | count is copied into the capture register. The processor calculates
 > | MIDI note and pitch bend information from this.
 >
 > Nice, do you have schematics and program available? I want these for my
 > child to convert singing to MIDI.

I tried it with voice too, of course. But it's very difficult to
control the pitch of the own voice when you hear something with a
pitch that relates to the voice's pitch but is at a different pitch.
Ever tried to sing through a pitch shifter? It's definitely easier to
control a synth with a conventional interface (like a keyboard) than
with the voice.

AFAIK these "voice intonation correctors" (whatever they are called -
think Cher effect) only work well when the singer does *not* hear the
modified voice signal while singing.

Ingo