This May Be A dumb Question.

[David Nereson]

About 4 cents per beat in the middle of the piano.  (To tune at A=442, we
tune 8 cents sharp), so 10 beats should be around 40 cents.  Set's see:  a
half-step is 100 cents, and at A4, A is 440 Hz and G#is about 415, so
that's a difference of 25 Hz.  Correlating this difference with 100 cents,
yes, we have  four cents per Hz, and thus 4 cents per beat.  If the
difference between A and G#'s frequency is 25 Hz, the two fundamentals
will beat at 25 bps.  If A is at 10bps with the fork, then the A is 10 Hz
flatter than the fork, and 10 x 4 = 40 cents.
	--David Nereson, RPT
P.S.  Do sightless, or "blind" (which term is PC nowadays?) technicians
have printers that print out e-mail in Braille, or something that converts
it to vocal sounds or what?

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]On
Behalf Of Vinny Samarco
Sent: Wednesday, January 31, 2007 8:44 AM
To: Pianotech
Subject: This May Be A dumb Question.


Hi,
Before asking this question, let me say that I am blind, and of course, I
don't use and etd.  If I tell a customer that their piano is flat by 10
beats per second, how do I calculate cents?
Thanks.

Vinny