Dear list,
thanks for all the pointers, I spend some time digging and came up with a
solution using purely faust-native code.
```
delay32(0, x) = x;
delay32(delta, x) = ((x >> delta) | (x' << (32-delta)));
```
all the best
Till
--
Till Bovermann
https://tai-studio.org | http://lfsaw.de | https://www.instagram.com/_lfsaw/
> On 5. Jun 2020, at 11:00, Matej Fröbe <[email protected]> wrote:
>
> Hi Till,
>
> maybe you can do it in Faust with something like this (not tested):
>
> bitDelay = _ <: >>(1), (%(2) : mem : <<(31)) :> _;
>
> I am new to Faust and wasn't sure how to test the code above because it uses
> integers. Any recommnedations how to do this?
>
> Matej
>
>
>
> Am Fr., 5. Juni 2020 um 07:41 Uhr schrieb Stéphane Letz <[email protected]>:
> Are you really sure this cannot be expressed using the recursive operator ?
>
> Do you have some already written code to show ?
>
> Stéphane
>
> > Le 4 juin 2020 à 16:58, Till Bovermann <[email protected]> a écrit :
> >
> > Dear list,
> >
> > I am currently trying to implement 1bit-synthesis mechanisms in faust and
> > have some sketches on how to implement that:
> >
> > It basically boils down to interpret a stream of integers (of a given
> > bit-depth, say, 32bits) as a stream of blocks (of size 32) of bits.
> >
> > This is quite close to hardware interfaces such as the i2s implementation
> > of the esp32 [1], which has native capabilities to transmit PDM (pulse
> > density modulation, aka DSD, aka 1-bit audio) [2].
> >
> >
> > the technical implementation would be to create a series of
> > 1-bit-block-specific operations (primitives) that could handle the basics
> > of such dsp. This would particularly mean to create a 1-sample delay
> > operator, i.e. an operator that turns the bitstream
> >
> >
> > 10110101...
> >
> > into
> >
> > 010110101...
> >
> >
> > I discovered the `ffunction` primitive that allows to integrate foreign
> > functions into the language, however, AFAICS (and according to sletz on
> > slack, and from what I got from the documentation at [3]), they need to be
> > stateless.
> >
> > the aforementioned 1-bit delay, though, requires a state (of one additional
> > integer).
> >
> >
> > does anyone know if there is a possibility to implement such a (1-sample)
> > delay as a primitive in faust?
> >
> >
> > all the best and thanks for your thoughts
> >
> > Till
> >
> > [1]
> > https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
> > [2] search e.g. for "pdm" in this article
> > https://hackaday.com/2019/04/18/all-you-need-to-know-about-i2s/
> > [3] https://faust.grame.fr/doc/manual/index.html#ffunction
> >
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>
>
>
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