Different Temperaments - A 441, 442 etc

Jul 26 2009 | 10:39 am
Hi everyone,
Apologies if this sounds basic. I've built a little tuner as a part of some picth analysis patches that I'm working on. Maybe I'm having a brain freeze, but I'm stuck on how to shift the reference pitch of A 440 to other temperaments such as 441 or 442. I would imagine that this would entail adding a constant decimal value to each integer midi note value.... would this be a correct assumption?? As the ftom object only converts to midi notes in integers I'm a little stuck as to how to find a constant value shift for each different tuning.
If anybody has a thought on how to achieve this that'd be great..
Thanks again,
Ben

• Jul 26 2009 | 11:05 am
Here's a patch showing the maths going on inside the [mtof] and [ftom] objects. I've included an inlet where you can set the reference pitch of A to something other than 440Hz. I hope it helps.
lh
• Jul 26 2009 | 11:31 am
• Jul 26 2009 | 12:18 pm
Thanks to you both for the patches.. they really help a lot. My maths is not that great so I guess I wouldn't have sorted this out with simple head scratching alone! But now that I have the maths I'll look into it properly to understand the conversion properly.
Thanks so much,
Ben
• Jul 26 2009 | 1:02 pm
you should also take a look at the Ejies
there you have the ej.mtof object:
"MIDI to Frequency (with tuning adjustment, works for lists)"
hth
ole
• Jul 26 2009 | 2:05 pm
emeidos wrote on Sun, 26 July 2009 03:39As the ftom object only converts to midi notes in integers
Actually if you put a floating point argument into ftom it will generate MIDI values with a decimal point deviation from 12tet. For instance 441Hz out puts the MIDI note value 69.04 which is A plus 4 cents.
• Jul 26 2009 | 3:24 pm
Another way is to change the "base" attribute of the [mtof] and [ftom] objects- check out the help files for each and open the "tuning" sub patch.
Eli
• Jul 26 2009 | 4:59 pm
Right, since Max 5, there's the base attribute, plus mtof/ftom also accepts lists.
• Jul 26 2009 | 7:13 pm
excellent i had not noticed that feature
• Jul 27 2009 | 3:46 am
Thanks to all for your input that's great!! Now I have a few options to consider.
(Oh and Emmanuel - I was up to see Paul Clift's Work at the Centquatre last month - really unique and interesting performance!!)
Cheers,
Ben