[PD] write to audio array at different speeds

José de Abreu abreubacelar at gmail.com
Tue Jul 17 15:47:45 CEST 2018

Well, if you use a delay, you'll need a delay that has a big size to avoid
discontinuities (in that case, loss of data due to small buffer), so i
don't see how this would be better than having a second array.

the only other way i think is if you do some "in place" calculation every
block, but you can only stretch down the table, having a "speeding up" feel
for the writing process. (Note: after writing this e-mail, i think that
there is a way to speed down too, but you will lose what tabwrite put in
the array, I will try this too).

When you send a bang to tabwrite~, it starts overriding the array every
block, so, you can replace each block in that array with a smaller one.
you'll need to keep track of in which block tabwrite is at and if the
writing is over to stop, i'll try this approach since i'm curious how this
could be done.

Anyway, i've done a patch demonstrating the control approach with 2 tables
that i said in the previous e-mail, don't know if is useful, but is here

2018-07-17 9:55 GMT-03:00 Liam Goodacre <liamg_uw at hotmail.com>:

> Thanks José, I hadn't thought of that. I'd like to avoid using a second
> array if possible, as it doubles the memory usage, but I'll do it if there
> are no better options.
> I've also found an object in the ggee library called [tabread4~] which
> sounds promising, but it doesn't have a help patch. Does anyone know how it
> works?
> ------------------------------
> *From:* José de Abreu <abreubacelar at gmail.com>
> *Sent:* 17 July 2018 13:25
> *To:* Liam Goodacre
> *Cc:* PD list
> *Subject:* Re: [PD] write to audio array at different speeds
> you can use 2 tables, write to one and then phasor~ + tabread4~ to another
> tabwrite~, and if you need the process to occur faster than real time (just
> to stretch the wave after recording the first table) you can use some until
> + switch~ magic.
> you can do the same process of 2 tables above in the control domain, using
> tabread4 to tabwrite for the second table (without tilde). This will need
> more math to build the until loop for picking the numbers that phasor~
> would provide, but won't need switch~ magic for "faster than real time".
> or use delread4~ with variable delay, but to calculate the right positions
> could be tricky, I don't know
> Em Ter, 17 de jul de 2018 08:49, Liam Goodacre <liamg_uw at hotmail.com>
> escreveu:
> It seems that [tabwrite~] writes only at one speed (presumably determined
> by the sample rate). But I want to use it to write audio to an array at a
> different speed. In other words, given an array of a set size, I want to
> determine that the recording will reach the end of the array at a different
> point in time than the default one.
> How could this be done? Is there any way to trick [tabwrite~] into writing
> at a different speed, ie. by sending it a different sample rate? Or can we
> do something clever with [delread4~]?
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