[FFmpeg-user] delay time in live ultrasound converter

Ted Park kumowoon1025 at gmail.com
Sat Apr 18 19:25:53 EEST 2020

I don't know where I can find bats nearby so I couldn't try it but how
does it work? The book makes it sound like you can use any mic, even
one built into a laptop for this? I suppose that's plausible looking
at a typical mic's frequency response graph, they are just cut off at
20khz, and don't roll off after 20khz like I thought they would, but
what about the sample rate? At 44.1kHz doesn't that mean anything over
22khz is more aliasing or harmonic distortion than an actual recording
of bat sounds?

On Sat, Apr 18, 2020 at 11:37 AM Michael Koch
<astroelectronic at t-online.de> wrote:
> Am 18.04.2020 um 16:52 schrieb Michael Glenn Williams:
> > The subject line about ultrasound caught me eye on this thread that woke up
> > from last year.
> > Can anyone tell us what the original interest in ffmpeg and ultrasound is?
> Well, you can use FFmpeg to convert ultrasound to lower frequencies, for
> example if you want to hear bats. I have described that in my book, see
> chapters 3.14 and 3.19 (but the chapter numbers may change in future)
> www.astro-electronic.de/FFmpeg_Book.pdf
> Michael
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