Hi Steven, Yes it does. One cent at a4 is about 1/4 hertz, at a5 1/2 hertz, at a6 1 hertz, at a7 2 hertz. As to perceiving it hmmmmmmmmmmm good question--how long does A7 sustain? 1 cent error at A4 = one beat in 4 seconds (approximate numbers) 1 cent error at a5 = one beat in 2 seconds 1 cent error at a6 = one beat per second 1 cent error at 17 = two beats per second Add to this mix the coupled motion of piano strings and the answer becomes even less clear. At 02:57 PM 12/23/2002 -0800, you wrote: > By bigger I mean more likely to be percieved aurally. Steve B >----- Original Message ----- From: Wimblees@aol.com To: >pianotech@ptg.org Sent: Monday, December 23, 2002 12:04 PM Subject: >Re: Cents to Hertz Conversion Chart >In a message dated 12/23/02 12:25:08 PM Central Standard Time, >joegarrett@earthlink.net writes: > > Alan, >Thanks for the link! Nice to have. One thing struck me: As this is a chart >to convert Cents TO Hertz,(CPS), there is nothing that shows the exact >cents >to achieve frequencies such as 435cps or 425cps. I wonder if there is a >reverse of this chart somewhere? >Oh, as an aside, on the bottom of the chart is the statement that this >chart >is copyrighted by "International Piano Suppy". Who/what is that? >Best Regards, >Joe Garrett, RPT, (Oregon) > > > > >Joe > > > >Cents are the measurement between intervals, and there are 100 cents >between each interval. There are 100 cents between A0 and A#0 and >between B7 and C8, and between every interval all the way up and down >the piano. The higher you go up the scale, the difference in the number >of Htz between notes gets greater and greater. The greater the >difference, the fewer cents there will be between beats. And the >opposite, there are fewer beats difference between intervals as you go >down the scale, so there will be more cents between beats. > > > >So if you want tune a piano to A435, considering there are about 4 cents >difference between beats at A4, you multiply 5 beats times 4 cents, and >you get 20 cents. If you want to go down to A425, you multiply 4 cents >time 15 beats, or 45 cents. > > So if you want to get super accurate, you'll have to off set your >machine to 19.5. But I don't think any one will hear the difference if >you play it safe at 19 or 20 cents below A. > > 50 cents below pitch? Whoever put this together at the International >Piano Supply Company either had too much time on their hands, or is >trying to impress piano tuners that they know something others don't. >But as far as I'm concerned, this is useless information. > >Wim > Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. mailto:pianotuna@accesscomm.ca http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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