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 Forum index » Instruments and Equipment » MAX/MSP - Pd
Convolution in Max/MSP
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Dogenigt



Joined: Oct 25, 2009
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Location: Denmark
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PostPosted: Wed Dec 08, 2010 9:25 am    Post subject: Convolution in Max/MSP Reply with quote  Mark this post and the followings unread

Hi,

I really want to make a simple convolution in max - that is (I am not sure I really understand the deeper concept of convolving signals) mating two signals with each other.

Is it sort of like taking the amplitude from an input signal and letting that control the frequencies of a carrier wave?

It is not a convolution reverb or anything like that I want to build.

I'd like to record like a cielo sample into a buffer and "trigger" it with another input signal. Making the cielo a "carrier wave" and the microphone the control signal.

is this to be done easily?
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dewdrop_world



Joined: Aug 28, 2006
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Location: Guangzhou, China
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PostPosted: Fri Dec 10, 2010 12:12 am    Post subject: Re: Convolution in Max/MSP Reply with quote  Mark this post and the followings unread

Paleorama wrote:
(I am not sure I really understand the deeper concept of convolving signals)


It would be good to start there. Try the Roads Computer Music Tutorial. I looked for some online resources for you but they are very dry and very math-heavy (e.g., http://www.dspguide.com/ch6.htm).

Quote:
Is it sort of like taking the amplitude from an input signal and letting that control the frequencies of a carrier wave?


No, that's frequency or phase modulation, totally different topic.

Quote:
I'd like to record like a cielo sample into a buffer and "trigger" it with another input signal. Making the cielo a "carrier wave" and the microphone the control signal.

is this to be done easily?


Convolution can do that if you turn your microphone triggers into single-sample impulses. But at that point, you may be better off making a buffer-player abstraction and poly~ing it. (Unless you want the sound of convolution... which is a cool sound!)

There may be other tricks... I'm familiar with Max but not especially fluent in it.

James

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Oberon



Joined: Sep 28, 2010
Posts: 3
Location: UK

PostPosted: Wed Feb 16, 2011 4:45 am    Post subject: convolution Reply with quote  Mark this post and the followings unread

What you want to do is possible and not terribly difficult if you understand a little about how convolution works. The best place to start is probably the Max tutorial files themselves which contain several patches which you could modify fairly easily.
What you are trying to achieve would normally be described as cross synthesis, using terms such as carrier in this context may lead to people misunderstanding what you are trying to do.
The Max forum on the cycling 74 website also has several patches of varying degrees of complexity which may be useful.
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