[PD] Echo-effect

Pierre Massat pimassat at gmail.com
Mon Mar 28 10:02:27 CEST 2011

Hi Stefan,

I'm sorry i didn't get your first requirement "Starts when there has been no
sound for 0,8 seconds". Could you be a little more specific?

If you need to have a strong control over the echo i think you should
probably use tables instead of delay lines, because you can write and read
to an from a table at any moment and at any point in the table.


2011/3/28 Stefan Magnusson <stefan.magnusson at gmail.com>

> Hi!
> Im currently working with a project developing tactile feedback for
> stimulation of disabled children.
> Im getting quite far in using a rough surface, a contact microphone and
> buttshaker. My signal path is something like
> mic->bandpass->filering->amplitude control of an
> oscillator->lowpass->speaker
> i wish to get the sound a bit more interesting, so i would like to add an
> echoeffect something like:
> -Starts when there has been no sound (amplitude=0 after filtering) for 0,8
> seconds.
> -Playbacks the last 1,6 seconds of sound (then there will be 0,8 seconds of
> noise and 0,8 seconds of silence) with 60% amplitude
> -Repeat the echo with decreasing amplitude (i.e 45, 30 and 0%)
> I believe i should use delay lines but i have a hard time controlling them
> the way i want.
> Some help would be really appreciated by me and the children
> /Stefan
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