The Logic Off Topic list

Joeri Vankeirsbilck on 4/9/00 9:52 AM, Joeri Vankeirsbilck at
joeri@... wrote:

> Hi,
> 
> Could anyone give me the formula to go from Note to Frequency?
> So, A4 = 440Hz, but I want to calculate F3 eg.

Try this chart....

for A=440 tuning:

A   55.00 110.00 220.00 440.00  880.00 1760.00 3520.00 7040.00
Bb  58.27 116.54 233.08 466.16  932.33 1864.66 3729.31 7458.62
B   61.74 123.47 246.94 493.88  987.77 1975.53 3951.07 7902.13
C   65.41 130.81 261.63 523.25 1046.50 2093.00 4186.01 8372.02
C#  69.30 138.59 277.18 554.37 1108.73 2217.46 4434.92 8869.84
D   73.42 146.83 293.66 587.33 1174.66 2349.32 4698.64 9397.27
Eb  77.78 155.56 311.13 622.25 1244.51 2489.02 4978.03 9956.06
E   82.41 164.81 329.63 659.26 1318.51 2637.02 5274.04
F   87.31 174.61 349.23 698.46 1396.91 2793.83 5587.65
F#  92.50 185.00 369.99 739.99 1479.98 2959.96 5919.91
G   98.00 196.00 392.00 783.99 1567.98 3135.96 6271.93
G# 103.83 207.65 415.30 830.61 1661.22 3322.44 6644.88



> And an even funnier one: I need to calculate what note could fit in an
> audio fragment of 256 samples at a sample frequency of 44100. What note
> could this be? (I guess 44100/frequency would give me the amount of
> samples, and that's why I need to find a way to calculate frequency out
> of the note).

You would need to express 256 as a percentage of 44100 then find the pitch
in hertz that when taken as the same percentage equals 256.