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SOUND.PAS
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Wrap
Pascal/Delphi Source File
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1991-01-28
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2KB
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55 lines
(10198) Wed 22 Jan 92 20:42
By: Ruurd Pels
To: Kevin O'Donnell
Re: Sound( );
St:
---------------------------------------------------------------------------
@MSGID: 2:512/23 297e1f86
@PID: XRS! 4.52
@REPLY: 1:243/2.5 297b4850
Howdy Kevin!
On 20 Jan 92 17:08, Kevin O'donnell, happily tapping away at his keyboard,
wrote to All:
KO> Could anyone tell me what the correct frequency (in Hz) is for
KO> Middle C on the piano? Or even better, A through G?
Correct frequency for middle A is 440 Hz. Method to derive scale:
Middle A is 440 Hz, one octave higher is double frequency, so a is 880 Hz
In the whole scale, there are:
Name Frequency
-+----- -----------------------------------------------
F sharp 440 * 2 to the power of ( -3 divided by 12)
G 440 * 2 to the power of ( -2 divided by 12)
G sharp 440 * 2 to the power of ( -1 divided by 12)
A 440 * 2 to the power of ( 0 divided by 12)
B flat 440 * 2 to the power of ( 1 divided by 12)
B 440 * 2 to the power of ( 2 divided by 12)
c 440 * 2 to the power of ( 3 divided by 12)
c sharp 440 * 2 to the power of ( 4 divided by 12)
d 440 * 2 to the power of ( 5 divided by 12)
d sharp 440 * 2 to the power of ( 6 divided by 12)
e 440 * 2 to the power of ( 7 divided by 12)
f 440 * 2 to the power of ( 8 divided by 12)
f sharp 440 * 2 to the power of ( 9 divided by 12)
g 440 * 2 to the power of ( 10 divided by 12)
g sharp 440 * 2 to the power of ( 11 divided by 12)
a 440 * 2 to the power of ( 12 divided by 12)
a sharp 440 * 2 to the power of ( 13 divided by 12)
b 440 * 2 to the power of ( 14 divided by 12)
b sharp 440 * 2 to the power of ( 15 divided by 12)
c' 440 * 2 to the power of ( 16 divided by 12)
Grtz, l~) l~ l~)
l~\ l~ l~ ;-)
---
* Origin: -=*#@ Programs Are Seen Clearly As Language @#*=- (RA 2:512/23)
@PATH: 512/23 0 1007