[sdiy] r/c phase shift on face (esoterica could save the pie)

[Tim Parkhurst]

On 4/18/07, Anthony Bisset <abisset at dspaudio.com> wrote:
> constantly humbled i am (not that i thought i knew anything)
> i now understand how a r/c filter works... hahahaha
>
> okay, but that'll only get me a phase shift amt that varies with
> frequency which is way to complex for constructing an audio terrain
> without dsp or autism.  so, back to coils and other such tricks.
>
> so my question is narrowed.  how can we throw the phase of a
> signal 90 degrees without it changing based on the a/c's frequency?
>
> -glasnost

One problem with a 90 degree shift: the 'delay' between the shifted
and unshifted signals required to get a 90 degree shift is going to be
frequency dependant. 90 degrees at 1KHz is a different amount of time
than 90 degrees at 1.5KHz. A 180 degree shift is a different animal.
This can be achieved by simply inverting the signal. If you tried to
do a 180 degree shift by delaying the signal, then it would also be
frequency dependant.


Tim (don't quote me on any of this, I haven't had my coffee yet) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein