Another approach to my troubles with AM demodulation of I/Q signals:

A) 
QSD -> I/Q -> Polyphasefilter (Allpassfilter) -> --???--> AM
           |
            -----------------------------------> --???--> AM

or

B)
QSD -> I/Q -> Polyphasefilter (Allpassfilter) ->

-> sum (adding) -> USB
|                         independently -> ISB --???--> AM
-> dif (subtract) -> LSB


--???--> is the symbol of analog hardware (not DSP or software)!

73
Chris





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