[FFmpeg-user] Multiply audio samples

Michael Koch astroelectronic at t-online.de
Wed Sep 12 10:44:53 EEST 2018

Is it possible to multiply audio samples from two sources?
I'd like to downconvert the 15kHz to 25kHz range to the 0 to 10kHz 
range. First apply a strong 15kHz highpass filter, then multiply the 
signal with a 15kHz sine wave (which produces sum and difference 
signals), then apply a 10kHz lowpass filter.


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