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

[Magnus Danielson]

From: Anthony Bisset <abisset at dspaudio.com>
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
Date: Wed, 18 Apr 2007 04:15:28 -0700 (PDT)
Message-ID: <Pine.LNX.4.58.0704180406390.5352 at fourier>

> 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?

It is kind of hard. The trick you can do is to delay the signal in two
different variants, which has 90 degrees between them. This is what the dome
filter of a frequency shifter does for instance. You can also use the polyphase
filters for this purpose.

Cheers,
Magnus