Forums > MaxMSP

transposition of frequency values …


anamaria
Aug 03 2010 | 11:59 am

Hi,

I dont work with midi. I work with the cycle~ frequency values and quarter tones, so:

How can I transpose the frequency values one octave, two octaves etc?

Thanks for your help!

ana


anamaria
Aug 03 2010 | 12:05 pm

… in other words:

How do I get quarter tone values in frequency values (starting from midi tone 60) and then how do I transpose those values?


Roman Thilenius
Aug 03 2010 | 1:07 pm

 
always do it on a linear basis.
 
if you have Hz, do for example [ftom] – [+ 0.5] – [mtof] to get the next quartertone in Hz.
 


Patrick Keenan
Aug 03 2010 | 1:13 pm

Hi,

Use [mtof] to change from midinotes to frequency.

To get quarter tone frequency values you could do what i have done in the example patch posted.

To go up an octave simply double the value, to go down, halve the value.

Patrick



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