16 Nov
2022
16 Nov
'22
3:14 p.m.
On Wed, Nov 16, 2022 at 12:51:44PM +0100, Florian Paul Schmidt wrote:
This ensures that what is a phase theta in the first
filter becomes a
phase of -theta in the second filter, and summed that just gives a phase
of 0.
1. If I understand this correctly the L and R outputs have opposite phase
shifts. That means they will not sum to the input. Just assume the L
shift is 90 degrees. then R is -90, and they will just cancel.
2. If you measure this, you will also note amplitude differences between
L and R outputs. This is to be expected. Even if the two filters have
exact unity gain (and just a phase shift) at each frequency corresponding
to an FFT bin, the resulting filter will not be all-pass.
3. At high frequencies (above 1 kHz or so), it's actually the amplitude
differences and not the phase shifts that create the stereo effect.
Ciao,
--
FA