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Conall   O Maolain

I'm working on a kind of spectrum visualiser. I'm using a multichannel FFT to get a range of signals at each frequency bin and display them in a kind of wave table form. In the jit.gen patch I had to separate each plane of the input matrix using the swiz operator but I'd like to be able to do this dynamically so I can use FFT's with higher resolutions without needing to add a bunch more swiz operators. 

I tried using javascript but it slows down the render rate too much. Can it be done at all?

Hello,

I'm working on a kind of spectrum visualiser. I'm using a multichannel FFT to get a range of signals at each frequency bin and...

dynamic-plane-separation-in-jitgen

Dynamic plane separation in Jit.gen

Stone

I have a gen~ patch that contains several copies of a gen abstraction, which is a bank of codebox filters in series, and the abstractions sum together before they are output into the MSP world. I can have three copies of the abstraction in a gen~ patch with no problem, but when I add a fourth I get an error message;

“gen_domain: dsp.gen: [string "gen2.Module"]:151: invalid replacement value (a nil)”. I presume this means I have one of the filters throwing 

If I’m on the right track then the rest of the message should tell me where this is happening. Can anyone help me decode the message? I have been using Gen for a while but this is new to me.

I have a gen~ patch that contains several copies of a gen abstraction, which is a bank of codebox filters in series, and the abstractions sum together before they are output into the MSP world. I can have three copies of the abstraction in a gen~ patch with no problem, but when I add a fourth I get an error message; 

“gen_domain: dsp.gen: [string "gen2.Module"]:151: invalid replacement value (a nil)”. I presume this means I have one of the filters throwing nan.  I have a bunch of filters.

Hello,
I have a gen~ patch that contains several copies of a gen abstraction, which is a bank of codebox filters in series, and the abstract

error-gen_domain-dsp-gen-string-"gen2-module"-151-invalid-replacement-value-a-nil

Error - gen_domain: dsp.gen: [string "gen2.Module"]:151: invalid replacement value (a nil)

The title says it - I've found RMS averaging through the forum, but I need bipolar averaging for a specific function. Is this possible in gen?

The title says it - I've found RMS averaging through the forum, but I need bipolar averaging for a specific function.  Is this possible in gen?

The title says it - I've found RMS averaging through the forum, but I need bipolar averaging for a specific function.  Is this possible in g

bipolar-average~-in-gen

The vanilla average~ object does bipolar averaging, doesn't it?

It does, but I'm trying to keep it in the Gen environment.

If this means simply averaging over the last N samples by adding them up and dividing by N, then one way is to have a [data] of size N, a write index that loops round the data writing in new values as they are received, and a routine to sum all the values in the data and divide by N (e.g. via a for loop). But there's a cheaper way that avoids the expensive for loop. On each passing sample frame, your sum should add the new sample, and subtract the value N samples ago; you can achieve this simply with a [delay] and a [+=] integrator. 

This makes so much sense! Thank you so much Graham, this is perfect.

There is an issue that if you change the value of N dynamically, the sum may drift away from what it should be, because you might get the input value subtracted twice or not at all; sending 'reset' to the gen~ will fix it by clearing out the delay line and setting the sum to 0. Right now I can't think of a way to fix this. 

It is a kind of windowed average but the window is a square shape, which means there's going to be some window noise if you are using this to track e.g. an oscillator. To make a more softly edged windowed average, you could either add some kind of non-leaky prefiltering of the input to spread values over time, or add some post-filtering of the average itself. Either way you will have a trade-off of the aliasing of the square window for the filtering effects, just like any windowed process. 

Solved for dynamic window size by using a tape-delay analogy. The trick is to move the write head, not the read head -- and put the erase head at the reader, not the writer. That way, even if the period is shortened or lengthened, still each value written into the tape will be read out eactly once. Also realized that post-filtering makes more sense than pre-filtering, as it may help reduce zipper when changing the period. 

Graham, this is excellent! This is going to be extremely useful.

Bipolar Average~ in Gen?

Ruz Kut

I've managed to translate the ascending insert-sort algorithm into GenExpr, but there are issues to be solved.

Mainly, it seems like it always miss some values, resulting in a semi-sorted buffer... ?

Do you think is a problem related to signed floating values ?

Is there a way to create an integer variable (not a constant) in GenExpr so the for-loops are more precise ?

I've also tried with [data] before with the same code, but It always gives me weird errors (gen~ kernel, unable to compile, etc...)

btw I'm doing this in order to modify the gen-chopper-repeat patch so that I can play grains by reading an index sorted by RMS values, so of course the more precise is the sorting the better. (the concept is that of grain-tagging, something like CataRT by IRCAM).

Hi all !
I'm no expert in code whatsoever
BUT
I've managed to translate the ascending insert-sort algorithm into GenExpr, but there are issues to be solved.
Mainly, it seems like it always miss some values, resulting in a semi-sorted buffer... ?

Do you think is a problem related to signed floating values ?
Is there a way to create an integer variable (not a constant) in GenExpr so the for-loops are more precise ?
I've also tried with [data] before with the same code, but It always gives me weird errors (gen~ kernel, unable to compile, etc...)

btw I'm doing this in order to modify the gen-chopper-repeat patch so that I can play grains by reading an index sorted by RMS values, so of course the more precise is the sorting the better. (the concept is that of grain-tagging, something like CataRT by IRCAM).


insert-sort-of-a-buffer-in-gen-codebox

Forgot to link my reference for insert-sorting
http://mathbits.com/MathBits/CompSci/Arrays/Insertion.htm

If only someone fluent with codebox could give my patch a look I'd appreciate it :)


I noticed one thing though, if you try and work with longer buffers the sorting contains less samples than the input. 

Yes -- the Max console hints at why: "gen~: audio processing exception: Too many iterations (runaway loop?)"

For safety, gen~ forces a limit on how many loop iterations can happen on each vector -- this limit is currently defined as 100000 * vector size. The reason for doing this is that too many iterations can cause an audio dropout, and infinite iterations will lock up the entire audio thread (possibly crashing it). Per Turing, there's no way to know in advance if a given piece of code will loop forever, so we work around this by having the loop iteration limit and bailing out of audio processing when this limit is reached -- and printing the warning to the Max console.

Although the buffer size in your patcher is 44100 samples long, and thus less than the loop limit, the insert-sort algorithm can cause millions of iterations due to the nested loop. This really is too many to process within one signal vector, and would cause audio dropouts. 

To process millions of samples in gen~, the solution is to distribute processing over time. Sadly there's not an easy way to convert the code to do this -- but after a bit of manual work, here it is working. What I found interesting in this is that the semantics of the code became a bit more obvious:

Note that if you want it to sort faster, you can wrap that final if() block in a for loop, but this will increase the CPU load:

Another option is to process the insertion sort via some non-gen~ solution. If you still want to use GenExpr, you could actually achieve it via jit.gen and jit.buffer~, but I don't think insertion sort is the best sorting algorithm to use, as it can't take advantage of the parallelism of cell-based processing. sample-sort, quick-sort, aa-sort etc. might work better.

Thanks for those examples - fascinating and illuminating! 

insert-sort of a buffer in gen codebox ?

Lionel

i've just noticed something weird when using more than one delay in a gen~ patcher (see the example below)

 With a feedback value of 1, there should be no decay but this is only the case for the first delay, not the second one... unless the delay times are multiples of each other !

Is this a bug or am i doing something wrong ?

Hi 

i've just noticed something weird when using more than one delay in a gen~ patcher (see the example below)

 With a feedback value of...

weird-delay-behavior-in-gen

Weird delay behavior in gen~

Recall the Coll

Hello, I was wondering if there is a way to normalize in gen~, like the normalize~ object works.

normalize-in-gen-like-the-normalize-object

Normalize in gen~ like the normalize~ object

axers fall

If you like this type of content, please leave a like, subscribe to my youtube channel and share this video!!!THANKS!!!

more amazing Max/MSP ambient sound design videos ► 

If you like this type of content, please leave a like, subscribe to my youtube channel and share this video!!!THANKS!!!

more amazing...

tutorial-how-to-make-a-ahd-envelope-in-gen

[tutorial] how to make a AHD envelope in gen~

Jieverson Maissiat

Hi! I'm trying to implement reverse delay on a different project that I have. Last week I have implemented different algorithms, but in all of them I have been dealing with weird clicks.To help demonstrate the problem I'm facing, I have build a very basic reverse delay here.... with a fixed buffer of sample rate size (so, 1 second), with variable time (difference between read and write starting position). Feedback control and mix between wet & dry. I've been using a single data object buffer, with poke and peek. I've tried different interpolations on peek, and have stick with linear or cubic. I also have a boundmode wrap at peek.

I'm attaching my code here, so you guys can check. The click is not SO pronounced... but I would like to remove it if possible.

Hi! I'm trying to implement reverse delay on a different project that I have. Last week I have implemented different algorithms, but in all...

Gen Forum