hi all!

I know I read about such an object but I can't find it now:
it should output a bang when a numeric stream (audio or not? can't remember) changes its direction (ascending -> descending, or the other way). For instance every half phase of an osc~ or so...

thanks for any help!

i don't know about a single object, but here's one way to make that:

[your numeric stream]
|
[t f f]
\ /
\ /
/ \
/ \
[> ]
|
[change]
|
[t b]

i don't know of such a thing for signals. although [samphold~] has a related action.

maybe if you used the sine wave to control the level of a [*~], you could monitor the output level with [fiddle~] and feed that into hardoff's solution?

yeah, but fiddle will only output the amplitude and frequency for a window (512samples default if i remember correctly)

for signals, the easiest way to know where the signal changes direction, is to create the signal yourself using [vline~] and [cos~]. see attached patch.

http://www.pdpatchrepo.info/hurleur/vline-peak-detector.pd

thanks for your elegant solution for non-signal hardoff

i'm afraid the patch for signals won't help this time but i still learned something!

I actually wanted to use it with the signal of the fft-analysis-window (for a sound with a clear pitch). i thought i could build a patch that detects every new overtone. then maybe it could for instance erase every one of two in each window or things like that. but i guess there are better ways of doing this...