String Tension Calculation

[Alex Galembo]

Hi, Terry,

Two ways.

First, simple - go to
http://www.geocities.com/galembo_alex/chc3.html
fill the form:
587.3295358  (nonstretched D5, use dot to separate decimals)
Inharmomicity 0
semitones 0
cents 60
Press "Calculate"
Receive result :608.0417 Hz

Second: calculate (for examplee, using Excel:
Freq(D5)*2^60/1200)

best luck

Alex


************
Alexander Galembo, Ph.D
Visiting Researcher
Dept. of Speech, Music and Hearing
Royal Institute of Technology
Drottning Kristinas v. 31
SE-10044, Stockholm
Sweden

Tel. work 46-8-7907856  home 46-8-7369978 Fax  46-8-7907854
email: alex@speech.kth.se
WEB http://www.geocities.com/galembo_alex/

-----Original Message-----
From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf
Of Farrell
Sent: den 13 januari 2002 16:34
To: pianotech@ptg.org
Subject: String Tension Calculation


To those of us less mathematically challenged than I:

I have the formula(s) (thanks Ron N.) for converting hertz to tension (given
a specific string diameter, density (or whatever), and speaking length), but
I need to convert pitch in units of notes and cents into hertz. For example:
I measure a pitch on my Accutuner as being D5 plus 60 cents. I know that I
can find a non-stretched pitch in hertz for D5 on a table somewhere (or any
other note - I have this somewhere I think), but how do I add the 60 cents
to the D5 hertz value? Thanks to any of the professors out there.

Terry Farrell