Hi, Bob.
You could reduce the rate of a process by using sample-and-hold functions
as in the example below:
import("stdfaust.lib");
mynoise(seed, period) = random / RANDMAX
with {
mask = 4294967295; // 2^32-1
random = +(seed) ~ ba.sAndH(clock, *(1103515245) & mask); // "linear
congruential"
clock = ba.period(period) == 0;
RANDMAX = 2147483647.0; // = 2^31-1 = MAX_SIGNED_INT in 32 bits
};
process = mynoise(12345, ma.SR); // a different value every second
If you just want a single random value, perhaps at the very beginning of
your process, you could just sample-and-hold a magnified and fmod-ed
version of whatever is in your ADC:
import("stdfaust.lib");
init_rand(x) = ba.sAndH(1 - 1', fmod(x * 2 ^ 20, 1)); // some 120 dB gain
process(x) = init_rand(x);
I wouldn't know how else to get a random value at time index 0 in Faust.
I hope it helps.
Dr Dario Sanfilippo
http://dariosanfilippo.com
On Thu, 6 May 2021 at 02:19, Bob Bobsled <thebobbobs...@gmail.com> wrote:
>
> Hi,
> I've pondered this code for a while, and am failing to understand how to
> declare a variable which has a single random value. Of course this code
> creates random values at the sample rate. How would you get just one value
> instead of a constant stream of values?
>
> mynoise = random / RANDMAX
> with{
> mask = 4294967295; // 2^32-1
> random = +(12345) ~ *(1103515245) & mask; // "linear congruential"
> RANDMAX = 2147483647.0; // = 2^31-1 = MAX_SIGNED_INT in 32 bits
> };
> process = mynoise;
>
> In other words, one would like to be able to do something such as this:
> process = os.osc(myrandomvalue);
>
> I understand there are various ways to provide frequencies, graphical and
> non-graphical. What I'm fundamentally searching for is how to declare a
> variable with a single random value. I cannot seem to figure out how to
> slow down or stop things from flowing at the SR other than set SR to 1.
>
> Regards,
> Bob
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> Faudiostream-users@lists.sourceforge.net
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>
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