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thomas zalud

Hi,I have the following question: I want to add an ADSR Gen patch to another Gen patch. To trigger the ADSR function, a toggle object is needed, which in this case is an object at the MSP level that feeds into the Gen object. However, I want to stay entirely within Gen. I want to integrate this ADSR into an existing Gen patch where the toggle signal is already present. Since I'm not very familiar with Codebox, how can I trigger the gate value directly within the Gen patch using Codebox?

Hi,I have the following question: I want to add an ADSR Gen patch to another Gen patch. To trigger the ADSR function, a toggle object is...

triggering-adsr-in-gen

Triggering ADSR in Gen

Joe Masi

Since this is my first post here: Hello to all of you!

Lets say I have two contact mics attached to a table. One on the left side and one on the right. The table is about 2 meters wide. I want to measure the runtime difference (is that correct english?) between the two mics when I knock on the table (Presuming that i am not knocking in the exact middle between the two mics). In a wooden table (c = 4000m/s) with a Sample Rate of 44100 I would get a resolution of 11 samples / meter. So the only chance to do this is in gen and since i am a max newbie I figured this out the hard way. Vector size :)

So what I want to achieve is: An impulse from contact mic 1 is arriving at in1. Once its amplitude is beyond lets say 0.4 (BTW whats the signal format in gen? 64 bit float with a range from -1.0 to 1 right?) I want to start a counter that counts until the impulse from contact mic 2 arrives at in 2 and exceeds 0.4

My big problem is: How do I keep the counter running until the impulse at mic 2 arrives?

Or to put it another way: How can I transform the signal from in1 to 1 right after the first transient has arrived and set it to zero when the impulse arrives at in2?

I tried if else statements but had no success.

BTW is it possible in gen to use && in an if statement to check for two conditions?

Would you do this patch completely in gen? Or would it be smarter to do the sample precise "triggering" in gen (since edge or anything similar isn´t usable) and then use a count~ in max? Why can count~ be sample accurate? Is that because bang and messages don´t depend from the vector size?

I have been working the last two nights on this without success so any help is greatly valued.

Since this is my first post here: Hello to all of you!
Lets say I have two contact mics attached to a table. One on the left side and one on the right. The table is about 2 meters wide. I want to measure the runtime difference (is that correct english?) between the two mics when I knock on the table (Presuming that i am not knocking in the exact middle between the two mics). In a wooden table (c = 4000m/s) with a Sample Rate of 44100 I would get a resolution of 11 samples / meter. So the only chance to do this is in gen and since i am a max newbie I figured this out the hard way. Vector size :)
So what I want to achieve is: An impulse from contact mic 1 is arriving at in1. Once its amplitude is beyond lets say 0.4 (BTW whats the signal format in gen? 64 bit float with a range from -1.0 to 1 right?) I want to start a counter that counts until the impulse from contact mic 2 arrives at in 2 and exceeds 0.4
Then the counter resets.
My big problem is: How do I keep the counter running until the impulse at mic 2 arrives?
Or to put it another way: How can I transform the signal from in1 to 1 right after the first transient has arrived and set it to zero when the impulse arrives at in2?
I tried if else statements but had no success.
BTW is it possible in gen to use && in an if statement to check for two conditions?
Would you do this patch completely in gen? Or would it be smarter to do the sample precise "triggering" in gen (since edge or anything similar isn´t usable) and then use a count~ in max? Why can count~ be sample accurate? Is that because bang and messages don´t depend from the vector size?
So many questions...
I have been working the last two nights on this without success so any help is greatly valued.
Thanks for your help!
Joe


measure-time-difference-between-two-inputs

you could have a += running that is sampled and then reset at the moment an impulse arrives at in2.

here's one (quickly thrown together) solution. this only works provided input 1 gets the first impulse every time. setting it up to get the difference between every impulse should be fairly simple, given this patch as a starting point. also, i convert from samples to milliseconds, i'm not sure if you needed that, but it's easily removed.

edit: after reading through your post one more time, i realize this isn't exactly what you're looking for! whoops. hopefully it's somehow helpful. i would use bonk~ to detect the transients, and the counter method i used in the patch is the way i turn bangs into impulses in gen (there's probably a better way, but this is how i do it!)


I added a simple method for envelope following.
btw you could use click~ to convert bang into impulses.


I had some attempt with a similar project using xcorrelation and found some good results on this...


Thanks for all the replies! Very helpful!
@ bertrandfraysse: Thanks for the code! Why did you use the sqrt after the abs? I know what it does mathematically but I don´t get what it does to the signal.
@ jestern: What exactly is xcorrelation? I was searching for it but didnt find any useful information.
So far this is working now for very short impulses. But if you look at the screenshot below you see that the impulses from the contact mics are about 5 to 10 ms long. So how would you achieve it that the counter does not reset every time the delta is below zero. I tried it with an if statement hoping that the two for loops would be executed one after another. But this doesn´t seem to work.


hmm, the pic link does not seem to work.
so here is the direct link:
https://www.dropbox.com/s/d9j191emd3i6uu9/Screenshot%202015-02-03%2012.20.52.jpg?dl=0


Hi Joe, sorry for the late reply, it's called cross correlation and it's used to estimate for example the delay of two signals..


the sqrt is used to grow the low values so the trigger is detected even if the amplitue is low. The abs is here because a negative sqrt will stay at zero.


Jersten is right, cross-correlation should be a good way of detecting the time difference. Since the number of samples is fairly low, it's cheap enough to do this in the time domain. It is also somewhat robust to amplitude differences between microphones.

Here's an example -- it might not be optimal, but it works:


very nice graham, thank you for sharing.


Measure time difference between two inputs

Luca Schwarz

Hey there! Just a quick one: Comparing a phasor ramp with a static value between 0 and 1 should give out a single sample trig in theory right? Any ideas how to implement such in gen? I tried this and it did not work out. 

Hey there! Just a quick one: Comparing a phasor ramp with a static value between 0 and 1 should give out a single sample trig in theory...

gen-comparing-question

Gen == comparing question

hey there. so i am building this little retrigger ratchet thingy which creates a specifiy amount of re-triggers based on the value in that int box. it works just fine when i trigger the bang manually. weirdly, when i plug in the trigger genarator in the patch (callled propabilistic trigger generator) my ratchet engine will only put out the correct amount of triggers after at the very first trig. every trig after it will miss out the last re-trigger. it is quite reliable with that missing out, though i dont get what is the reason for it. any ideas? also open for any aspects of more elegant soloutions for this patch. thx in advance for your help, it is really apreciated as usual :)

hey there. so i am building this little retrigger ratchet thingy which creates a specifiy amount of re-triggers based on the value in that...

gen-ratcheting-acting-unexpected-1

Gen ratcheting acting unexpected

Eric Sterling

Is there a design pattern for where you have a set # of modulators (say LFOs) and you want to be able to select what they modulate? Other than a select with an absurd # of outputs?

Is there a design pattern for where you have a set # of modulators (say LFOs) and you want to be able to select what they modulate? Other...

matrix-modulation

Matrix Modulation

dequalsrxt

I've got a simple delay line as part of a bigger patch I've been working on and it has some delay time modulation. I started with a triangle lfo - no problems there. Then I wanted some variety, so I added the ability to skew the triangle to an up/down ramp, to reset the lfo, and to latch/sample-and-hold the modulated delay time. And of course all of these generate clicks in the signal. I can avoid the clicks when engaging the latch/sah by using the delay_morphed_times_no_pitch_change patch from the GO book to crossfade between delay taps when the delay time change occurs. But I'm stuck on how to adapt the patch to avoid the clicks caused by the ramps and lfo reset and also keep the pitch modulation. Maybe latch the delay time of one tap right before the sharp change occurs, then crossfade over after somehow? I haven't figured out how to do that yet. 

I've got a simple delay line as part of a bigger patch I've been working on and it has some delay time modulation. I started with a...

avoiding-clicks-in-a-pitch-modulated-delay-line

Avoiding clicks in a pitch modulated delay line

Da Xu

I am running into a strange issue. I am trying to convert one of my gen~ patches into external via Rnbo. 

The patch works in Max, however when I reference it in Rnbo, it throws up some very strange error.

Codegen Error Error: Gen parsing failed: SyntaxError: Expected "!=", "!=p", "&&", "(", ",", ".", ";", "<<", "<=", "<=p", "<p", "=", "==", "==p", ">=", ">=p", ">>", ">p", "?", "[", "^^", "||", [\-*+/%], or [\-/+*%\^&|<>] but "h" found.

    at C:\Users\mouren\Documents\Max 8\Packages\RNBO\server\node_modules\@rnbo\xam-runner\lib\runner.js:143:27

 (C:\Users\mouren\Documents\Max 8\Packages\RNBO\server\node_modules\@rnbo\xam-runner\lib\runner.js:71:16)

    at C:\Users\mouren\Documents\Max 8\Packages\RNBO\server\dist\controllers\controllerInterface.js:291:39

    at Object.codegenInProcessJSON (C:\Users\mouren\Documents\Max 8\Packages\RNBO\server\dist\controllers\controllerInterface.js:287:76)

    at handleServerStreaming (C:\Users\mouren\Documents\Max 8\Packages\RNBO\server\node_modules\@grpc\grpc-js\src\server.ts:973:11)

    at processTicksAndRejections (node:internal/process/task_queues:95:5)

There were errors that referenced some lines in my gen~ patch:

RNBO:     start: { offset: 817, line: 32, column: 9 },

RNBO:     end: { offset: 818, line: 32, column: 10 }

I looked at that line. What I saw in the Code box was a bunch of declarations for Delay and History, but interrupted by an assignment from in to a variable.  I did not write the code in this order, it was generated by gen~.

One thing to note is that I am using nested gen~ patches, and each nested patch uses about 8 delay lines, plus history. 

I remember reading somewhere that all Delays and History had to be defined at the top of the file?

Could that be the reason why Rnbo is freaking out? But why is Max not throwing up any errors and been happily running the code for the past few months. 

While I am at it, is there any best practices with regard to nested gen~ patches and encapsulation? What if I include multiple copies of the same gen~ subpatch?

Delay and history definition order - Error in Rnbo, but not Max

delay-and-history-definition-order

Boris Uytterhaegen

Just diving into gen~ and having a lot of fun figuring stuff out.

I'm trying to write a smooth sounding, CPU efficient sinusoidal oscillator in CodeBox, which I intend to use in a bigger feedback oriented FM/PM system. I have implemented the following features:

All seems to be working at this point but since this is a first I would like to know if and how I can improve on the design. 

Any input would be very much appreciated!

Hi!

Just diving into gen~ and having a lot of fun figuring stuff out.

I'm trying to write a smooth sounding, CPU efficient sinusoidal...

Gen Forum