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Thom DUMA

Hello, I use the Plot ~ and windowed-fft combo for create an audio frequency graph. I would like to report the frequency (axe x) and magnitude value (axe y) with the mouse function report, or other... Is it possible ? or there is an another way ? Thank you

Plot ~  and fft: how to mouse report real coordonates values on graph ?   (dB and  Hz)

plot-and-fft-how-to-mouse-report-real-coordonates-values-on-graph-db-and-hz

axers fall

In this tutorial,I will show you how to make basic types of filters by defining a certain band range with pfft~ object.

Please check out my youtube channel for more Max/MSP ambient sound design videos!!!!!! Like,Share and Subscribe : 

https://youtube.com/@axersfall369?si=O84jQK6eTGOsH1T5


Join my patreon to unlock more amazing Max/MSP ambient patches ► https://patreon.com/user?u=42206236&utm_medium=clipboard_copy&utm_source=copyLink&utm_campaign=creatorshare_creator&utm_content=join_link 



8-steps LFO ► https://axersfall369.gumroad.com/l/jkcsls 

Please check out my youtube channel for more Max/MSP ambient sound design videos!!!!!! Like,Share and Subscribe :  https://youtube.com/@axersfall369?si=O84jQK6eTGOsH1T5

In this tutorial,I will show you how to make basic types of filters by defining a certain band range with pfft~ object.
 


Join my patreon ... 

spectral-process-with-pfft-basic-filters

Hi AXERS FALL. Thank you for this very interesting step-by-step tutorial.

May I take this opportunity to ask more general questions about pfft~ and filtering ?

It seems that pfft~ acts as an extremely efficient filter (it purely eliminates unwanted frequencies, preserves phases ... ). But can it advantageously be used in lieu of all the other filter objects available in MAX ?  Are there instances where it makes more sense to keep using them ?

Do some standard MAX filter objects contain some "hidden" pfft~ code, or are they all sample-based algorithms ?

I learned from previous experiences that converting frequencies into bin# can be challenging (1 frequency can spread over several bin#), but is there any other inconveniences in using pfft~ as a filter ?

I'm not good at English,but I kinda get what are you asking......
pfft~ object can insert some effects(like delay,distortion ETC.) to specific frequency bands like band20(? frequency --- ? frequency)only band 20 apply the effects you insert.(you can do band20 is delay effect and in the meantime,band 32 and band 55 is distortion effect),this is the application for fft~ process I usually used.
filters I think just filters,maybe use other algorithms......but I prefer build-in objects like reson~,onepole~,I use them a lot......(because I know nothing about the filter algorithmsLOL)

none of the vanilla filter externals have anything to do with FFT... though one could argue that buffir~´s process is based on a releated theory, which you also often use with FFTs.

never use buffir~ object before...but I think they are different objects and process......sorry,I'm still learning fft~ objects,maybe there's more application method around this object......maybe you can check out more fft~ patch in file browser.

Sebastien Gay : using pfft~ does not allow you to "purely eliminate frequencies, preserve phases". There are lots of cases where you might prefer other kinds of filters. Experiment. Listen to the artifacts. Make you choice based on the specific application. I would even ask the question the other way around: are there cases where it might be advantageous to use pfft~ rather than another kind of filter? There are, indeed.
Anyway, anybody interested in the content of the video should study the Forbidden planet example, as well as the FFT-related tutorials, both included with Max.

classic misunderstandment that FFT would offer a flat phase spectrum or an infinite steep transition band.

its strength lies elsewhere and not in technical properties. for example it is great for vocoding with free re-routing of bands to other bands. or for learning a noise profile.

There are, indeed. Anyway, anybody interested in the content of the video should study the Forbidden planet example, as well as the FFT-related tutorials, both included with Max.

How people look surprised by my naive beginner questions, sometimes surprises me ;-)
I am fully aware that these audio-signal-processing things  are probably far too complicated in comparison to what I will ever be able to understand. But I have, over the past few months, spent more time than a basic MAX explorer like me should do, on different pfft~ trials, in order to improve. When I said "purely eliminates unwanted frequencies" (as opposed to other types of filters), for instance, I was referring to this type of images : 

The only real limitation, as far as I can figure out, is the fact that there is not simple direct relationship between a given frequency value and a specific bin#. A frequency can be "present" in a range of consecutive bin#, making it difficult to "target" precisely which bin# to select or eliminate ?

@ Roman : I think I understand what you mean about PFFT's strength, though !

A pure musical consideration, lastly : I love how pfft~-filtered noise sounds ! ;-)

it is true that with FFT is it computationally cheaper and easier to realize -∞db  within a few semitones. (or a few semitones more in the sub 100Hz range)

but what is a good brickwallfilter worth when you can not set the frequency parameter as you wish and when it comes with 8000 samples latency? :)

the relationship of bins vs hertz is simple; it is linear. in a pfft 4096 you work with bands of 10.7 Hz each, from zero to nyquist.


Also, if you are interested in the fact that what the FFT does is equivalent to what 512 (or more) bandbass filters do, read Mark Dolson's article "The Phase Vocoder: a Tutorial". Computer Music Journal, 1986, a reference.

[Spectral Process with pfft~] basic filters

Phil Maguire

I'm looking to experiment with some simple Markov Chains to do some probabilistic switching of a matrix. I'm looking for some general guidance.

Firstly, is the attached patch an accurate representation of a zero order chain? I think it is, but I'm not certain.

Secondly, would higher order chains be useful for this kind of switching? I'm a little lost in the technicalities.

I've had a look at ml.markov but I'd rather not get involved with MIDI data. I've also looked at prob but not really understanding how it works.

Hi all,
I'm looking to experiment with some simple Markov Chains to do some probabilistic switching of a matrix. I'm looking for some general guidance.

Firstly, is the attached patch an accurate representation of a zero order chain? I think it is, but I'm not certain.

Secondly, would higher order chains be useful for this kind of switching? I'm a little lost in the technicalities.

I've had a look at ml.markov but I'd rather not get involved with MIDI data. I've also looked at prob but not really understanding how it works.


Hi all,
I'm looking to experiment with some simple Markov Chains to do some probabilistic switching of a matrix. 

markov-chains

instead of prob you can build something around random and gate which does the same, then you will know what it does on a lower level.

a 0th order state/transition system is about as useful as 0th oder ambisonics i guess (and i am not sure how it will look.) 

starting with 1st order seems easier. :) 

for higher order you can then simply write the additional future states (seen from here) as list into a coll. likewise with parallel states, such as note number, velocity and duration, no matter how you want them to be combined.

at the moment i dont see how histo could be of help? you want to count identical data input, not make it a new entry.


Thanks Roman. I've put histo in there to keep track more easily (for me) of the count. Just a visual aid.

What I'd like to figure out is how to use the previous 'n' states to influence the probability of future ones. I'll take a look at using coll.

for smaller amounts you can write the repetition of an already existing entry again, so that

1, 5 6 6;

means that from 1 you go to 6 with 66% probability, to 5 with 33%, and to all other next states with 0%.

the random function itself for this is then simply linear: choose one of all entries.



for bigger numbers of the same data you might want to use symbols of two ints and write the amount as additional int.

1, "5 1", "6 2"


Markov Chains

face_head

its the new camera that is being marketed with the whole playstation vr system, its really cheap in my case 70 aud retail.

would love to start to work with it in max , if anyone hears about an osx 10.2.2 driver would be amazing if you posted here

https://www.playstation.com/en-au/explore/accessories/playstation-camera/

would love to start to work with it in max , if anyone hears about an osx 10.2.2 driver would be amazing if you posted here 

https://www.playstation.com/en-au/explore/accessories/playstation-camera/


new-playstation-camera-osx-driver

I don't know much about this. But I'll check this out.

New playstation camera osx driver ?

Uasmi Nasser

I'm trying to slice a sample based on transient detection. I currently have a gen~ patch (attached) that detects transients and their position in samples (using accum). 

What I'm struggling to do right now is to tie it to a groove~ position (from 0. to 1.) I've tried using delta~, but I get a lot of noise when I try to move it from MSP to Max world.

So, ideally, I would like to store indexes (slice numbers) inside coll, where each row will contain slice number and position in range of 0. to 1. (rather than in samples). 

Hi everyone,

I'm trying to slice a sample based on transient detection. I currently have a gen~ patch (attached) that detects transients and their position in samples (using accum). 
What I'm struggling to do right now is to tie it to a groove~ position (from 0. to 1.) I've tried using delta~, but I get a lot of noise when I try to move it from MSP to Max world.

So, ideally, I would like to store indexes (slice numbers) inside coll, where each row will contain slice number and position in range of 0. to 1. (rather than in samples). 

For example:
0, 0.2345 (first transient)
1, 0.342 (second transient)
etc.



Hi everyone,

I'm trying to slice a sample based on transient detection. 

transient-sample-slicing-using-gen~-and-groovebox~

To convert a position in samples to a position in 0-1 phase, just divide the sample position by the buffer length.

Your patch might have a mistake. If you wanted to ensure that segments are at least 1000 samples long, to avoid capturing too many transients, then I think the [or] should be [and] and the [< 1000] should be [> 1000]. 

The [> 0.] after the [or] is unnecessary; the output of logic ops like [or] are always either 0 or 1. 

BTW you could do the analysis inside of gen~, without needing groove~, and it would simplify a lot: add a [buffer sample] and use a [counter dim(sample)] into a [peek sample] to feed into your transient detector.  If the transient is detected, then the value of the counter *is* the sample index. If you want it as phase just divide by the buffer length, e.g. [/ dim(sample)].  The counter's middle outlet can be used as the reset signal to replace in 2. 

Here's an example. It also dumps the results into a buffer~ (rather than a coll).

MaxMSP Forum