[sdiy] Frequency to MIDI Conversion

[harrybissell]

Ho ho ho thats 'obvious' all right...

but I think it will dither around the correct pitch won't it... and we
need to use the pitchbend to really close in on the correct pitch in
oh... a week or so ???   :^)

H^) harry

Magnus Danielson wrote:

> From: harrybissell <harrybissell at prodigy.net>
> Subject: Re: [sdiy] Frequency to MIDI Conversion
> Date: Tue, 18 Feb 2003 23:49:20 -0500
>
> > I agree with the posts of "it can't be done polyphonically"...
> >
> > With a mono signal... you can convert to CV or to Midi.  I'm doing
> > this with the PV-1 board (also mentioned) with the CV digitized...and
> > fed to a lovely little MIDI board (PIC micro) made by Roman Sowa
> > (also of s-diy) which takes a seven bit input and streams MIDI messages.
> >
> > I'm quantizing a theremin with it. Theremin is VERY monophonic.
> >
> > Both myself and Mike Irwin (co-incidentally...also of s-diy) have used
> > a mono synth output to drive the P/V converter.  If you have any CV output
> > its better to process that directly. The Juno won't have that...
>
> That nobody proposed the "obvious" solution:
>
> <seriously blond mode>
> By magic of feedback you take a spare DX7 (or any other MIDI synt capable of
> sine output) and an op-amp. The op-amp takes the mono output of the synth on
> it's feedback input (neg) and takes the input signal on its reference input
> (pos) and drives the MIDI to the synt and output from the output. Naturally
> would it drive the MIDI until the synt phase-locks to the reference signal,
> no?
> </seriously blond mode>
>
> Seriously, the real lesson is that we need a truckload of conversions.
>
> Cheers,
> Magnus