Hi Group,
I'm looking for pointers to existing designs and/or ideas about using allpass filters for de-correlating L/R information while retaining absolute levels.
I think I have seen such functionality once in a phase-meter or correlation meter - though it may have been in something peripherally related to this .
IIRC, the idea was shifting one side 90degrees phasewise, which would allow L/R addition (comparison?) without loosing S-perspective.
The application is that I'd like to be able to do a summed (common) sidechain audio for stereo compression without reverting to simple summing (which would be the same as just using the M-component, ignoring the S-component) - and I'd like to do it already in AC domain, before rectification..
Help!
Jakob Erland
I'm looking for pointers to existing designs and/or ideas about using allpass filters for de-correlating L/R information while retaining absolute levels.
I think I have seen such functionality once in a phase-meter or correlation meter - though it may have been in something peripherally related to this .
IIRC, the idea was shifting one side 90degrees phasewise, which would allow L/R addition (comparison?) without loosing S-perspective.
The application is that I'd like to be able to do a summed (common) sidechain audio for stereo compression without reverting to simple summing (which would be the same as just using the M-component, ignoring the S-component) - and I'd like to do it already in AC domain, before rectification..
Help!
Jakob Erland