[PD] frequency shifter

[Chuckk Hubbard]

I had no idea what you guys were talking about, but I tried it and it
sounds wicked.  Where did you pick up this idea?

-Chuckk

On 11/24/06, derek holzer <derek at x-i.net> wrote:
> hard off wrote:
>
> >>> I would simply use two
> > more triangle oscillators in place of the pitch shifters, and set the
> > frequencies using a bit of math based on the frequency of the first
> > triangle oscillator.<<
>
> > if you could help me with the math required, i would be very grateful.
>
> It's simpler than you might think... Take the number that is providing
> the frequency for the first triangle oscillator and add (or subtract)
> 175 and 224 to (from) it and use this number to set the frequency of the
> other two. I'm not sure which direction the frequency shifter is
> supposed to go in this diagram, so try either adding or subtracting.
> Also what is not clear is if the original triangle wave is heard in your
> diagram, or only the two pitch shifted ones, so either you will only
> hear the frequency-shifted pair or you will hear all three mixed with
> your two sinus waves.
>
> [number box\   <---set master frequency
> |      |          |
> |     [+ 175] [+ 224]  <---set shifted frequencies
> |      |          |
> |      |         [triangle~]
> |     [triangle~]
> [triangle~]
>
> Where [triangle~] is an abstraction you have made which produces a nice,
> bandwidth-limited triangle wave ;-)
>
> If my cheap ASCII art doesn't come through, let me know and I'll be less
> lazy and patch it...
>
> Hope this is clear enough,
> d.
>
>
> --
> derek holzer ::: http://www.umatic.nl
> ---Oblique Strategy # 112:
> "Magnify the most difficult details"
>
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