Forums > MaxMSP

filter in Max

March 18, 2008 | 3:13 pm

Hi everydoby

I have problems with Max objects. I want to filter a flow of numerical data (parameter coming from the analysis of a video, like the brightness for example) in order to control a synthesizer (basically, control the frequency of a cycle~). I only find MSP filters for audio signals. Is there a way with Max objects to do what I want? Objects like speedlim don’t fit because I want the notion of filter (lowpass with very low central frequency)?

Thank you all

PS : Sorry for my bad english, I’m a french student.


March 18, 2008 | 3:43 pm

Look into objects like [slide]. You can also make your own filters
using [expr].

On Mar 18, 2008, at 9:13 AM, Thomas HEZARD wrote:
>
> Hi everydoby
>
> I have problems with Max objects. I want to filter a flow of
> numerical data (parameter coming from the analysis of a video, like
> the brightness for example) in order to control a synthesizer
> (basically, control the frequency of a cycle~). I only find MSP
> filters for audio signals. Is there a way with Max objects to do
> what I want? Objects like speedlim don’t fit because I want the
> notion of filter (lowpass with very low central frequency)?

—-
Steven M. Miller
Professor, Contemporary Music Program
College of Santa Fe

Home < http://pubweb.csf.edu/~smill>
SFIFEM <
http://sfifem.csf.edu>
Atrium Sound Space <
http://atrium.csf.edu>
OVOS <
http://pubweb.csf.edu/~smill/ovos.html>
CMP <
http://www.csf.edu/academics/contemporary_music/>


March 19, 2008 | 12:33 pm


March 19, 2008 | 5:41 pm

If you want to filter out numbers that fall within certain ranges, try < , >, and split.

"select" is also great for filtering out specific numbers. type in all the numbers you want to remove from the data stream, as arguments. then everything that doesn’t match the arguments you’ve supplied comes spilling out the rightmost outlet.


March 19, 2008 | 9:38 pm

Thank you all.

Thank you so much Peter. Your package is very interesting. Thank to your idea, I found the solution to my problem, I just made a subpatch calculating the average of the N previous number. So I have a low-pass filter: the sum of the z exponent -i with i from 0 to N (I knonw, I could have thought a little bit more before to post the message…).

Best

Thomas


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