To all those who promptly responded, many thanks! (Jim, Gina, Newton, and others) I was figuring about -48 cents, but realize that the mathmatical formula is not exactly perfect. Kent was most helpful in providing the following table. Thanks Ken! Kent Swafford wrote: > > If you offset the SAT 4 cents for every 1 Hz difference between 440 and > the frequency at which you wish to tune, it will be accurate enough for > most any application. > (428 then would be -48 cents) > > If you feel the need for ultimate accuracy, there are formulae to do > these conversions taking into consderation that Hz and cents do not have > a straight line relationship. > (1200 cents flat = 220 Hz, a difference of _220 Hz_ from 440, while > 1200 cents sharp = 880 Hz, a difference of _440 Hz_ away from 440.) > > Here is a conversion table made up with formulae taught by Steve > Fairchild: > > CENTS/HZ CONVERSION CHART > > Frequency(Hz) to Cents Deviation (Offset) > A4 = 415Hz = -101.3 cents > A4 = 428Hz = -47.9 cents > A4 = 430Hz = -39.8 cents > A4 = 435Hz = -19.8 cents > A4 = 440Hz = 0.0 cents > A4 = 441Hz = 3.9 cents > A4 = 442Hz = 7.9 cents > A4 = 443Hz = 11.8 cents > A4 = 444Hz = 15.7 cents > > Cents Deviation to Frequency(Hz) > A4 = -50.0 cents = 427.5Hz > A4 = -25.0 cents = 433.7Hz > A4 = -15.0 cents = 436.2Hz > A4 = -10.0 cents = 437.5Hz > A4 = -5.0 cents = 438.7Hz > A4 = 0.0 cents = 440.0Hz > A4 = 5.0 cents = 441.3Hz > A4 = 10.0 cents = 442.5Hz > A4 = 15.0 cents = 443.8Hz > > Kent Swafford Thanks Again! Rob Goodale, RPT
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