Jess Mardon

Hey, wonder if someone could help me tweak a patch to have a reliable way to calibrate FFT amplitude values.

What I'm doing is listening via adc~ and then performing a realtime FFT analysis on the incoming signal. The FFT results are then transmitted over serial to drive motors on an arduino setup. The arduino code assumes it will receive FFT bin amplitude data in the range 0-1 and then maps this to the min-max range for the motors. The reads over adc~ can be quite quiet (compared to a signal synthesised within max) so I tried normalising the signal to a factor of 2 and then clipping the result to get a boosted signal that stays within the desired amplitude range. But, I think I must have misunderstood the function of the clip object, because I sometimes get FFT amplitude reads over 1. Because these are then outside the max range for the motors, the motor doesn't fire at amplitude reads over 1. The ardiuno code is doing a few other things, so I'd prefer not to rewrite that end of the code and find a solution at the max end.

What I'd ideally like to achieve is a way to calibrate the volume of the adc~ signal so that regardless of the input volume I can ensure that the loudest sounds are close to but never exceeding an amplitude of 1 on the FFT analysis.

FFTsend.maxpat

Hey, wonder if someone could help me tweak a patch to have a reliable way to calibrate FFT amplitude values.
What I'm doing is listening via

normalise-amplitude-to-a-range-for-fft-analysis

Didn't know about the [normalize~] object, but it looks like it's just a [*~] object.
Anyway, what do you want to [clip~]? If you want the values given by the fft to be clipped, then you must put your [clip~] object in your [pfft~].
Better yet, [clip~] right before you give the values to your Arduino.

Note that the maximum values you get as energy in each fft bin are not limited to 1. Check out MSP Analysis Tutorial 4 (pfft~) for more insight. Most of the bin values will turn out to be in a low range [0-1] but some of them can be quite high (actual theoretical value depends on the windowing, actual value will depend on your input signal, of course).

Thanks so much, Yes you are right, the pfft results could be more or less anything ;) 

Yes normalise works quite well for boosting quiet signals.

I will try clipping just before / after the fft analysis to see if that makes the difference.

Normalise amplitude to a range for FFT analysis

Frans-Jan Wind

I'm trying to create a list where the values are the Y-axis values of a normal like distribution. My math is just not good enough to accomplish this. Ideally there would be two parameters, one for the mean (or center frequency) and one for the with of distribution. Typically this would look like a notch filter graph. In the pasted patch you can see I'm completely stuck in the [expr] function.

I would appreciate if someone with more math knowledge could give me a hand with the functions to use in the expression

notch-filter-curve-in-list

Wouldn't the actual normal distribution do?
Here it is written in expr syntax(1/($f3*sqrt(2*3.141593)))*pow(2.718282, -0.5*pow(($f1-$f2)/$f3, 2))

Perhaps adding a [pow 0.01] after the [expr] might be useful, otherwise the gain is very low.

Notch filter curve in list

David Clements

Been working on this part of my patcher for a while and a bit stuck.

I'm making a playback system. Chords come in from the frontend (not in realtime), which will be connected to timepoints. I want the machine to work out how long each chord lasts for. So for example:

^ the dm7 has 3 rests following it, so can conclude it last for 4 beats. The Cmaj7 has 7 rests following it so can conclude it lasts 8 beats

I've found a way to represent chords with zero, and the following beats to show numbers representing the gaps ahead, so the above becomes:

I need to now convert this so the zero becomes the length of the harmony for each chord, so the above would become:

(First two chords last 4 beats, third chord lasts 8 beats).

Hard to explain, but will prob make more sense when you see the patch. I've labelled it with comments to help clarity.

Been working on this part of my patcher for a while and a bit stuck.
I'm making a playback system. Chords come in from the frontend (not in realtime), which will be connected to timepoints. I want the machine to work out how long each chord lasts for. So for example:
Dm7 - - - |G7 - - -|Cmaj7- - - -|- - - -
^ the dm7 has 3 rests following it, so can conclude it last for 4 beats. The Cmaj7 has 7 rests following it so can conclude it lasts 8 beats

I've found a way to represent chords with zero, and the following beats to show numbers representing the gaps ahead, so the above becomes:
0321|0321|0765|4321

I need to now convert this so the zero becomes the length of the harmony for each chord, so the above would become:
4 0 0 0|4 0 0 0|8 0 0 0|0 0 0 0 
(First two chords last 4 beats, third chord lasts 8 beats).

Been working on this part of my patcher for a while and a bit stuck.
I'm making a playback system. Chords come in from the frontend (not in 

i'm-stuck-mathsobjectsstuff

Why this complicated counting  ? seems a simple task.
When you detect a chord, reset counter to 1 and count till next detection appears.
Detected beats till next chord make a leading number, than you append number or zeroes
nn - 1
So if for example Dm7 did not change for 11 beats, than  


P.S. if all you want is to convert that list 
0 3 2 1 0 3 2 1 0 7 6 5 4 3 2 1

Thanks for your reply. Sorry, i didn't respond at the time because I didn't entirely understand your reply. Looking at it again, i think i understand the issue. You're treating it as realtime question, but it's actually a instantaneous process which maps the harmony onto the 'page' so when realtime events occur via transport, they react to it.
I actually think i've found a way around anyway by using colls for the harmony, so it can query any timepoint, but if that doesn't work out maybe i'll come back on here. But anyway, I wanted to say thatnks for taking the time to respond. 
Cheers

i'm stuck - maths/objects/stuff

Namfon.Natcha

Is there an object that reverses an order of letters in a message? i.e "a cat" to "tac a". 

Is there an object that reverses an order of letters in a message? i.e "a cat" to "tac a". 

Thank you very much. 

retrograding-an-order-of-letters-in-a-message

retrograding an order of letters in a message

Hello, I would like to fill a Data/Buffer object in gen but instead of writing to it with a pointer/index I would like to append every new sample to the end of the Buffer Stream + move existing samples forward by 1.

Hello, I would like to fill a Data/Buffer object in gen but instead of writing to it with a pointer/index I would like to append every new sample to the end of the Buffer Stream + move existing samples forward by 1.

Is this at all possible inside of Gen?

Hello, I would like to fill a Data/Buffer object in gen but instead of writing to it with a pointer/index I would like to append every new s

appending-samples-to-a-buffer-instead-of-index-writing

Appending Samples to a Buffer instead of Index Writing

Ut mio  Vu

I am writing to get help in how to transfer the RGB colour bar divide them and transfer into comprehensive words (e.g. it is red , it is yellow , it is orange.) I'm stuck at separating them into 7 rainbow colours. I tried to use + and select the gate 1 or 2 however, the situation is when I touched the green part, it tells it is green and it is blue at the same time, almost whenever I touched others specific colour it also appears two. Hope someone could help me ! Thx a lot!!!

I am writing to get help in how to transfer the RGB colour bar divide them and transfer into comprehensive words (e.g. it is red , it is yellow , it is orange.) I'm stuck at separating them into 7 rainbow colours. I tried to use + and select the gate 1 or 2  however, the situation is when I touched the green part, it tells it is green and it is blue at the same time, almost whenever I touched others specific colour it also appears two. Hope someone could help me ! Thx a lot!!!

I am writing to get help in how to transfer the RGB colour bar divide them and transfer into comprehensive words (e.g. it is red , it is yel

identifying-colours-!

Sounds like you need to convert RGB to HSL. H (Hue) should be the rainbow colour range, unless the color is black, white or gray. This happens when S (saturation) or L (lightness) have extreme values. There is an RGB to HSL patch here


oh right, that must be one of the 1367 patches i never finished. :P

https://1cyjknyddcx62agyb002-c74projects.s3.amazonaws.com/files/2014/04/hsl.jpg

for jitter you will most likely want to write a shader. 

but not before checking if the colorspace conversion you need is not alrady available in some stock object.


Identifying colours !

Screw Your Crappy one month trial

Hi there, I have been experimenting a bit with the jitter objects, (to be more specific, jit.xfade and jit.pix/jit.glpix) and was wondering if its possible to do the following. Basically, my idea is to create a system where lets say, every time I press bang, It would add a 1x1 pixel to a jit.pwindow as a way to transition to another media, and the more I pressed it, the more it would reveal from that second one. I made a rough drawing on paint of what would that look like. I presume I might also have to use other objects like jit.gl.layer and jit.gl.videoplane but if anyone could clarify me on this one I would be very glad :)! Also, I hope I wasn't too confusing on this one.

image.png

Hi there, I have been experimenting a bit with the jitter objects, (to be more specific, jit.xfade and jit.pix/jit.glpix) and was wondering 

wondering-if-this-is-possible-to-do-with-jitter

Everything can be done with Max!

This is one approach: 



The problem is that you would need [urn] to work with arrays bugger than 4096 for this to work in a more efficient way. 
As it is it's just sampling random points at every frame, repeating sometimes  points already sampled. 
It would take an awful amount of time to get out a 320x240 image, not to talk about full HD. 

masking: black and white -> alpha channel of something else

Not exactly what you asked, but maybe an idea you could apply to HD:


Wondering if this is possible to do with jitter?

leaozinho

I'm trying to learn Gen and granular synthesis by getting my hands dirty and building a synth from scratch in Gen. Most granular synths (at least that I see) use samples, but I wanted to follow Curtis Roads' example in his book Microsound and see if I could make a granular synth using a sine wave as its sound source. I've achieved that (I think) with this patch, but am getting some undesirable clicks and pops when I try to use longer grain durations with higher-density settings, as the envelope gets cut off. Maybe this is unavoidable for high grain-density/long-duration circumstances - I don't know - so I figured I'd ask about it here and see if anyone has any input for how to treat this scenario. I've pasted the patch. In order to duplicate the clicks I'm referencing, try setting 'GRAIN DENSITY' to 20. and GRAIN DURATION to 85.

single_channel_grain.maxpat

I'm trying to learn Gen and granular synthesis by getting my hands dirty and building a synth from scratch in Gen.  Most granular synths (at least that I see) use samples, but I wanted to follow Curtis Roads' example in his book Microsound and see if I could make a granular synth using a sine wave as its sound source.  I've achieved that (I think) with this patch, but am getting some undesirable clicks and pops when I try to use longer grain durations with higher-density settings, as the envelope gets cut off.  Maybe this is unavoidable for high grain-density/long-duration circumstances - I don't know - so I figured I'd ask about it here and see if anyone has any input for how to treat this scenario.  I've pasted the patch.  In order to duplicate the clicks I'm referencing, try setting 'GRAIN DENSITY' to 20. and GRAIN DURATION to 85.

I'm trying to learn Gen and granular synthesis by getting my hands dirty and building a synth from scratch in Gen.  Most granular synths (at

smoothing-for-a-rudimentary-granular-synth

Well, it's unavoidable if your synth is mono. You can use poly~ or mc.gen~ to make it polyphonic. However you'll need to implement your own voice allocation since the existing ones don't work in audio rate.

Thanks for the reply.  That makes sense that it's unavoidable in this implementation - I figured that might be the case.  Hmm..I did try implementing this in mc.gen~ to see if I could handle it that way, but to no effect.  I find that I still get the same issue.  Try this patch, with settings like a grain density of 400 and duration of 100 ms.

Yeah, 30 voices aren't enough for that. I think the following expression gives you the values that won't produce clicks

duration * density / mc_channelcount <= 1000

Maybe you could implement a retrigger function like the retrigger attribute of adsr~.

BTW you need to add an mc.mixdown~ before the live.gain~. In it's current form you can hear only two voices. Maybe that's why it seems that nothing has changed.

your second comment did indeed help reduce the clicks and pops.  forgive me, but I'm confused about your first comment: are you saying that I need a greater number of @chans in the ~sig object? (greater than 30?). And where are you imagining implementing the expression you mentioned?  It will return a 0 or 1, what is that value controlling?

I'm not suggesting you implement the expression in Max (although you could). It's for measuring whether you'll get clicks or not. As long as you don't violate the inequality (if it returns 1) you won't get clicks. 

To get rid of clicks when taking over a voice, you need a 'predelay stage' begore attack during which the prior voice is rapidly released. Even a 5 msec predelay stage is enough to stop clicks.   

That is helpful, @Ernest!  I've never tried to implement a predelay stage, let alone in mc.gen~.  Do you have any examples of that or resources on that in mind?

Yes, there are some examples in synthcore and the 32-voice synth at

awesome.  if you can point me to a specific feature, that would be super helpful, but it's fun poking around in here nonetheless!

Here's a gen~ ADSR demo patch from when I designed in UI objects instead of wrote code. It contains a lot of notes. It's not as efficient as codebox, but it's a good way to understand how it works. It's got a lot of extra functionality such as shaping the ADSR stages which you'll probably want to strip out. I'm sorry the max UI does need improving, but at least it should start drawing an envelope right away when you open it. 

Smoothing for a rudimentary granular synth

Hyacinth

polybuffer-crashes-but-only-sometimes

polybuffer crashes, but only sometimes

zion

When using 'Preset' Object - How do I  maintain  the priority of recalling saved objects values? 
Sometimes it is crucial because Object A depends on Object B's  value.
Thanks! 

When using 'Preset' Object - How do I  maintain  the priority of recalling saved objects values? 
Sometimes it is crucial because Object A d

preset-object-priority


the order is always the right to left order of the objects themselves - when they are connected. when they are not connected to preset you can not control the order i think.

creating parameters which depend on other parameters is not illegal but i would try to avoid it generally.

 where required, you will usually already have patched the right order. 

for example there is no good reason to include a numberbox, which shows the product of A*B in any kind of preset system. it is enough to include A and B.


"pattrstorage client objects are grouped according to priority. Clients with smaller priority values are recalled before clients with larger priority values. This is useful when parts of the patch must be updated before other parts are."

Preset Object Priority

Ben Bracken

. The Runner provides plug and play access to a 

 from the Max application, using using OSCQuery for communication with the running code.

This update features a new web-based interface with routing capabilities, expanded hardware support, along with many other improvements and bug fixes. Improvements include:

We've also rolled in direct support for the 

 add-on package, and have included a number of other improvements and bug fixes. Check out the release notes 

We are happy to announce the release of RNBO 1.3.0, available now for download via the Max Package Manager.

With this update, we are...

rnbo-130-released

RNBO 1.3.0 Released

We are excited to announce the availability of our 

 as a public beta. We’ve worked closely with 

. The Eventide H9000 is a rack-sized multi-effects unit with powerful DSP processing capabilities and numerous high quality built-in effects. We’re excited to enable RNBO export for this and open the door to unique custom studio effects and instruments without the strict limitations of other hardware platforms.

RNBO support is similar to the existing Gen support, but more streamlined, and uses the built-in 

, rather than a watcher patcher, to manage the export process. Eventually, all of these changes will be rolled into the standard release versions of RNBO and this package.

Get the preview version of the RNBO package (v1.2.7-eventide.0):

Get the preview version of the "Eventide H9000" package (v1.0.4-beta.3):

We’d love to hear any experiences and feedback from RNBO users with access to an H9000. To join the discussion, use the 

We are excited to announce the availability of our Eventide package for RNBO as a public beta. We’ve worked closely with Eventide to bring...

Cycling '74 Forums

We are happy to announce the release of RNBO 1.3.0, available now for download via the Max Package Manager. With this update, we are...

We are excited to announce the availability of our Eventide package for RNBO as a public beta. We’ve worked closely with Eventide to...

Thanks so much, Yes you are right, the pfft results could be more or less anything ;) Yes normalise works quite well for boosting quiet...

Perhaps adding a [pow 0.01] after the [expr] might be useful, otherwise the gain is very low.

Hi Source. Thanks for your reply. Sorry, i didn't respond at the time because I didn't entirely understand your reply. Looking at it...

Thank you very much!

Hello, I would like to fill a Data/Buffer object in gen but instead of writing to it with a pointer/index I would like to append every new s

Also [jit.rgb2hsl]

Not exactly what you asked, but maybe an idea you could apply to HD:

Here's a gen~ ADSR demo patch from when I designed in UI objects instead of wrote code. It contains a lot of notes. It's not as efficient...

//

"pattrstorage client objects are grouped according to priority. Clients with smaller priority values are recalled before clients with...