Different Temperaments - A 441, 442 etc

Ben Carey

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

Luke Hall

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.

Max Patch

Copy patch and select New From Clipboard in Max.

LoneMonad aka don malone

Max Patch

Copy patch and select New From Clipboard in Max.

Ben Carey

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

o s

you should also take a look at the Ejies

http://www.e--j.com/?page_id=42

there you have the ej.mtof object:

"MIDI to Frequency (with tuning adjustment, works for lists)"

hth

ole

Lewis Keller

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.

Eli

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

Emmanuel Jourdan

Right, since Max 5, there's the base attribute, plus mtof/ftom also accepts lists.

LoneMonad aka don malone

excellent
i had not noticed that feature

Max Patch

Copy patch and select New From Clipboard in Max.

Ben Carey

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