shhhh

i have an audio signal coming into max that i want to use to control other things. it's a slightly mellowed-out squarewave that varies between about 100hz right on down to 0hz. I need to be able to detect the frequency.

I've been experimenting with jehan's pitch~ without much luck -- it doesn't seem to be able to make much sense out frequencies in this range. Anybody have any ideas?

i have an audio signal coming into max that i want to use to control other things.  it's a slightly mellowed-out squarewave that varies between about 100hz right on down to 0hz.  I need to be able to detect the frequency.

I've been experimenting with jehan's pitch~ without much luck -- it doesn't seem to be able to make much sense out frequencies in this range.  Anybody have any ideas?


pitch-tracking-at-very-low-and-sub-audio-frequencies

This kind of low tech but if it's really just a variant of a square wave and you have a guarantee of only 0 only twice per wave , why not just measure the zero crossings?

hmm yeah. what object can you use for that?

hmm yeah.  what object can you use for that?


less reliable for higher frequencies of course.

a cheap and nasty solution perhaps..
less reliable for higher frequencies of course.


[zerox~] doesn't seem to work too well because i have to turn the signal vector up ridiculously high to get any usable data. kthozoid i'll check out your method.

[zerox~] doesn't seem to work too well because i have to turn the signal vector up ridiculously high to get any usable data.  kthozoid i'll check out your method.


(the minimum object~ and the three divisions aren't really necessary.

wow, thanks audiomatt. brilliant solution. This works very well.

wow, thanks audiomatt.  brilliant solution.  This works very well.


pitch tracking at very low (and sub-audio) frequencies