Am 12.09.2018 um 09:55 schrieb Paul B Mahol:
Hi,
On 9/12/18, Michael Koch <astroelectro...@t-online.de> wrote:
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.
There is no yet amultiply audio filter, but I could write it.
Am I correct that for it you need two audio streams as input and one
audio stream as output?
yes, two inputs and one output. I think it would be best if it works
independant of bit depth. First normalize the input signals to -1...+1
range, then multiply them so that the result is also in the -1...+1
range, then normalize back to 16bit or 24bit range.
Michael
--
**********************************************
ASTRO ELECTRONIC Dipl.-Ing. Michael Koch
Raabestr. 43 37412 Herzberg
www.astro-electronic.de
Tel. +49 5521 854265 Fax +49 5521 854266
**********************************************
_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
