crimeanwaters

I'm still getting acquainted with the fft~ objects and I was hoping someone might be able to offer some generous assistance in figuring out how to generate an inverted spectrum, within regular audible hearing range - so that frequencies at 0 hz would output at 20 khz, etc...

I apologize if this is redundant... I feel like there must be a fairly straight-ahead way of doing this..but I don't have much of a mastery of this area yet..

Hi -
I'm still getting acquainted with the fft~ objects and I was hoping someone might be able to offer some generous assistance in figuring out how to generate an inverted spectrum, within regular audible hearing range - so that frequencies at 0 hz would output at 20 khz, etc...

spectrum-inverting

It might not sound as you think it should - our hearing range is logarithmic, the bins are not...

You should also look into vocoder techniques...

You should also look into vocoder techniques...
Might sound better than fft...


last year i did an installation at the steim for amsterdams "sonic acts" festival inversing frequencies:

http://www.flickr.com/photos/sonicacts/page5/

i wasn´t inverting the raw bins (that sounds dreadful) but using sigmund~ and its track feature and then doing a resynthesis. the remapping of the frequnecies happened there with the help of some scaling.

last year i did an installation at the steim for amsterdams "sonic acts" festival inversing frequencies:
http://www.flickr.com/photos/sonicacts/page5/

i wasn´t inverting the raw bins (that sounds dreadful) but using sigmund~ and its track feature and then doing a resynthesis. the remapping of the frequnecies happened there with the help of some scaling.
this sounded quite good.

or just ringmodulate your sound with mr. Nyquist (no need for fft)

oh my god mr giri your mr nyquist idea is AWESOME! so simple! well for the mere mortals such as i, anyway. THAT should go in mr benson's simple-stuff thread... thanks!

yes its the simplest solution, for sure.
but sounds ugly as hell :-)

thats why i choose sigmund~ back then
hans


spectrum inverting?