Ok, I've got a tricky one here. I'm setting up an experiment on pitch shift using wav files. I'd like to be able to pitch shift and preserve duration; in real time with sounds of indeterminate length. Is this asking too much or will it just take some time to work out? Any ideas?

"imwithstupid" ha ha ha

hey ten thousand...what's the j_dlop object used in that patch? i can't find it anywhere.

yeah... the name "imwithstupid" is one of those I've used before in other forums...wasn't sure if it would fit in here in an academic sort of forum but at least someone got a kick out of it.

Also, thanks for that patch its helped with my ideas for this patch...I'll post my progress soon (hopefully)

oh, sorry - the "j_dlop" object is just a few lowpass filters chained together, It's just there to keep the high frequency stuff under control. Go ahead and delete it, and if you can put a "~lop" (or two) in its place if you want.

I've made some sort of progress with this patch...it doesn't really work at the moment, but if anybody wants to make it work or has any ideas that would be great. I know i'm overlooking something completely obvious right now...its probably because i'm a newb.

pitchshifter

here, I made a few changes to the patch you posted... try it out. let me know what you think.

pitchshifting

Thank you very much...i'll continue to work with it and post stuff here periodically.

I guess I didn't understand how delwrite~ and vd~ worked.

I've made some progress:

I found this patch that is very close to what I wanted to make in the docs directory. It is called pvoc.pd and its a vocoder but it pretty much does what I wanted to do. I've modified it a bit to do some things but its not finished yet. On my todo list are 1)making the sound loop 2)sending the output of the transpose/pitch box to a file every second or 10ms 3)using a joystick to control the transposition/pitch.

Here is the progress: PitchShifter.pd

Again, thank you all very much for your help.

ah just read your original post, about using wav files of sounds of indeterminate length.

i use the [filesize] object for that. i use aif files, so not sure what the deal is with wav's, but you just connect a message with the file name to a filesize object, and it gives you the size of the file. for aif's at 44.1khz stereo, it works out as 44100 x 4 bytes for every second.

and yeah, pvoc roxs with its soxs off!