[sdiy] Frequency shifters, again

[jhaible]

> JH mentioned using two frequency shifters with a fixed filter bank in
> between the other day, and that got me thinking about other things the
> technique could be applied to.
>
> What about flanging? Or just a small fixed delay. If you sweep the FS
> instead of the delay time, the notches of the resulting comb filter
> would all shift by the same frequency and maintain their spacing,
> instead of sweeping by some integer multiple and spreading apart.
>
> I don't know if this would would sound any better than standard
> flanging, but it seems like some mixture of frequency shift (up/down) ->
> flange -> frequency shift (down/up) might be interesting.

Yes, these are the applications I have in mind. Just a delay between the
upshift and downshift might not create great results, but a comb filter
from a fixed delay, mixed with the straight signal, between up- and
downshift might be interesting.
Int's always imortant that the shifted signal is still in a frequency range
which the downshift-dome-filter can handle.
Also interesting: downshift -> comb filter -> upshift. (Maybe)

JH.