Hello.
I have buildt a SQ-matrix decoder for 70's quadrophonic records. It is a constant 90-degree phase shifter circuit with basic opamps. But now I have bumped on a discrepancy, I found on different pages.
The question is:
Is the rear signal shifted -90 degrees in both left and right,
or
is it shifted +90 in one, and -90 in the other channel?
Much abliged for any clarification.
Timor