ET converter

[talasiga]

I don't know whether this is the right forum or the precise title but I thought this would be too techie for the pub.

Does anyone know of any calculator or conversion table website that can convert equal tempered pitches from one calibration to another?

Is that a clumsily put question?

let me explain - I want to be able to work out for example, if I have D4 at 296.39 which ET calibration it relates to given that D4 at 293.66 is relative to A4 at 440.

Thanks in anticipation .....

[hans]

will this converter do?
http://www.phys.unsw.edu.au/music/note/

or this?
http://www.michaelnorris.info/freqtonote.html

both use A=440Hz as their base, i.e. show the difference relative to A=440Hz

this may be useful a well:
http://www.birdsoft.demon.co.uk/music/sampcalc.htm

Use the calculator from http://www.michaelnorris.info/freqtonote.html to get precise detuning value, then use http://www.birdsoft.demon.co.uk/music/sampcalc.htm, entering 440 as original frequency, and the detuning value into the transpose box, and click "calculate final frequency", to give you the base frequency of your A.

[MTGuru]

I like this page as a handy grab-bag of conversion tools:

http://www.sengpielaudio.com/calculator-centsratio.htm

[talasiga]

Thank you both of you but as I have limited time now I have looked at MT's link first.

So MT let me know if there is a better way of doing this.

I went to "frequency to note" calculator and entered 665.3636 and it said this is E5 with a 15.96cents deviation (from the E5 relative to A440 I presume)

Then I went to the second from the top calculator and put the 440 in the freq. 1 box and in the freq. 2 box fiddled about until I had entered a value that gave me the 15.96 result in the "cents" box. In this case it was about 444.047 that is the relative ET tonic for my particular dominant E.

Is there a better procedure using your link?

[MTGuru]

Then I went to the second from the top calculator and put the 440 in the freq. 1 box and in the freq. 2 box fiddled about until I had entered a value that gave me the 15.96 result in the "cents" box. In this case it was about 444.047 that is the relative ET tonic for my particular dominant E.

Is there a better procedure using your link?

I think if you use the use the results of your first calculation in the "Changing of the frequency about a cent value", you can avoid the fiddling about. Enter 440 Hz and 15.96 cents to give the 444.075 result directly.

If you have access to a spreadsheet ... It's easy to take any reference frequency and calculate the successive 12th-root-of-2 ratios up and down as far as you like.

[hans]

You may just as well compare frequencies directly.
Example:
Divide your E freq. of 665.3636 Hz by the E freq. of 659.255 Hz (ET at A=440Hz calibration, from this list for instance http://www.sengpielaudio.com/calculator-notenames.htm) and multiply by 440 Hz to give you your new reference A:
665.3636/659.255*440 = 444.077

Frequency ratios stay the same when shifting the tuning pitch.

[talasiga]

Excellent stuff. Thank ye.