Forums > MaxMSP

Amplitude Demodulation

Sep 24 2011 | 11:51 am

Hi all,
does anybody know of an existing external or patch, that does Amplitude Demodulation ?

I have a low frequency signal (around a few Hz) and amplitude modulate it by 10.000 Hz.

Now I want to extract the original signal from the AM signal.

Any help or link is well appreciated!


Sep 24 2011 | 7:23 pm

Hi Frank
I tried doing this with math-tilde objects ([/~] etc), but eventually settled on the old Renaissance algorithm known as "cheating":

— Pasted Max Patch, click to expand. —


Sep 25 2011 | 4:51 pm

maybe something like this?


-- Pasted Max Patch, click to expand. --

Sep 25 2011 | 10:38 pm

btw – the initial phase value of the rightmost cycle~ should be 0.5 (set the float connected to the right inlet of cycle~)

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Forums > MaxMSP