Hi forum,

I am trying to figure out how to build a circular buffer in order to granulate and pitch shift live input. I would like the incoming signal to be stored in an Array and have the read index follow behind the write index. I specifically want to use an Array for this and not a delay line.

The problem is obviously that the read index cannot overtake the write index since there will be a glitch in audio, and with pitch shifting and randomization this would be inevitable.

Through some research I'm thinking that this sort of implementation can maybe be done with wrap~ and some kind of delay line on the read index, but I'm not sure how to build it. I've seen examples of circular buffers in other languages but with very little concrete explanation of how the code works.

I'm hoping someone here might be able explain to me in detail how I should approach this.

Thanks in advance!!
j

Don't really know how to do this either, but I've attached a quick approach to it.
I'm using a [metro] with a time interval which is equal to the time needed to write stuff to the buffer, and then delay the bangs from [metro] and send them to a [line~] which will control the [tabread~] (it's attached).
Check it out and let me know what you think. I'm also interested in this.

http://www.pdpatchrepo.info/hurleur/array_circular_buffer.pd

Thanks Alexandros, I'm going to check out your patch.. At a glance it looks like basically what I had in mind in terms of delaying the signal and playback

I was thinking for pitch shifting etc. that a phasor would be needed to control the rate and position of playback, and maybe this is where wrap~ would somehow come into play.

I'll mess around with it over the next few days and if I figure out anything concrete I'll post it back.

...also I dig your music that you have up on your site!
cheers!
j

did you find a solution eventually?

Thanks for your comment!