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What about using with the PC Radio Card which actaully recieves AM and FM radio signals?
Any capability to resolve the positive-going from the negative-going modulation peaks of a MW AM waveform must be done in the r-f domain. All of the active r-f circuits in this PC radio card are internal to it, and normally wouldn’t be accessible to the card user.
The card would deliver demodulated program waveforms to the PC soundcard as audio streams, much as though the audio output of any AM/FM receiver was connected to the audio input jack of a PC.
Also — most PCs generate a lot of r-f interference to sensitive receivers located near them due to switching power supply noise and all the digital signals present in the PC. Probably this would affect the useful S/N possible for the audio outputs of the card.