hi !
On Wed, 24 Oct 2001, David McCallum wrote:
I'm trying to route the samples of an audio signal (adc~, notable) according to their value. I tried using max~ and min~ to separate them but I found that max~ and min~ clip all the audio coming in, but still output their min or max value even when the incoming sample is out of range. (ie. a sample value of 3 put through a [max~ 4] comes through as 4, not nothing. (or even 0 would be nice))
to get "nothing" out of a signal-object is contradictory to the idea of signals. digital streams have to be 44100 samples per second (or whatever samplerate you use), or else, they would stop being streams.
still, there are various approaches for your problem:
- use 0 instead of nothing (which "would be nice"):
1a) subtract a signal, that is clipped-by max~ (or min~) from the original signal: you will get only those samples, that are higher (or less) then a specifique value, the rest being zero 1b) you can compare signals with >~ and <~ (zexy) and multiply the output with the original signal
but then, you could leave the stream-layer of pd and move over to the message-layer (with pack~/unpack~). bit this is highly inefficient...
This is for waveshaper algorithms where samples in certain rangesget treated differently.
waveshaping ? what about using tabread4~ (but i guess, itshould be more sophiticated..)
Any suggestions? I think I'm probably overlooking something.
see 1a)
mfg.casd.asdf IOhannes
David McCallum