Variable with memory longer then one sample inside Gen Codebox
Jun 08 2016 | 2:07 pm
Hi everybody,
I'm a real beginner with MAX/MSP. Currently I use it as a prototyping playground to get a bit more used with digital audio Processing.
Right now, I'd like to generate a sort of clipping, that holds on outputting the clipped value for some more samples, after the input Signal already got back under the threshold value. This "hold"-time should be half of the time the input signal was over the threshold. To do that, I thought of something like that:
threshold = 0.6; //fixed value
samples_over=0; //initial value
if (in1>threshold){
out1=threshold;
samples_over=samples_over+1;
}
else {
if (samples_over>0){
samples_over=samples_over-2;
out1=threshold;
else {
samples_over=0;
out1=in1;
}
}
But if I noticed everything right, the code in the codebox is looped on a sample basis, so assigning 0 to "samples_over" as an initial value just resets its value with every new sample. How do I create a variable with a memory that lasts longer then one loop cycle and just gets one initial value once the signal processing got started? I'm sure this is a basic and simple task - most probably I just don't know the right keyword to google for ;)
Thank you in advance
Janos
- Jun 08 2016 | 2:34 pmYou want the 'History' object(it stores 1 sample value in memory through each perform loop, if you ever need more than 1 sample history use the 'Data' object(and there's also 'Buffer' to store in a buffer~ which resides outside the gen~ patcher)). You also don't need a nested if statement, because the ordering of your conditionals can be satisfied with an 'else if' instead. Here's the code you want:
History samples_over(0); //initial value threshold = 0.6; //fixed value if (in1>threshold) { out1 = threshold; samples_over += 1; } else if (samples_over > 0) { samples_over -= 2; out1 = threshold; } else { samples_over = 0; out1 = in1; }Interesting concept in action, here's my test in a patcher:...and for reference: https://docs.cycling74.com/max6/dynamic/c74_docs.html#gen~ - Jun 09 2016 | 7:35 amGreat, this was exactly what I was looking for! Works exactly like I expected.I even came across the "History" object while searching for a solution to my problem but I didn't get the Idea of using it this way...
