Text: AMADEUS VOXON / FLASH
COPYRIGHT 1997
Hello to all lovers of Speccy! At the heart
pent a grievous thought:
- All music on AY-editors kidding! All
The fact is that people who rewrote
or write their editors, not
hesitation, ready to take constant notes
previously known editors (ASM, Sound
tracker ...). But the question is - whether they are true
constants? Obviously, they were selected by ear! In fact, oddly
enough, in the world there is a single table of notes and she
can not vary depending on geography.
Therefore they need to calculate correctly
and in accordance with world standard!
I even hesitated at first: Maybe their foreign car does not
work at 3.5MHz? .. Having considered the frequency of notes
taken from ST and ASM, I knew it was time to tell the world
about this terrible mess, as inconsistency notes. Agree that
the frequency for the music people are also invented for a
reason, and not some genius once dawned, just true musical
frequencies perceived by the brain much more strongly than any
other (say, such as in foreign editors). Our young programmers
race began to write music editors: A steeper another, another
powerful first. But all of them have one drawback, which
reduces everything to nothing - I say constants of the
illiterate is nice!
Below I give a table of frequencies of notes within the 8m
and octaves and a method for finding the constants for the
AY-891h (F (tact) = 1,75 MHz).
1.TABLITSY FREQUENCIES OF MUSIC WITHIN 8u OCTA
C-C # D-D #
1 32.70 34.65 36.71 38.89
2 65.41 69.29 73.42 77.78
3 130.82 138.58 146.84 155.56
4 261.64 277.16 293.68 311.12
5 523.28 554.32 587.36 622.24
6 1046.5 1108.6 1174.7 1244.5
7 2093.1 2217.2 2349.4 2488.9
8 4186.2 4434.6 4698.9 4977.9
E-F-F # G
1 41.20 43.65 46.25 49.00
2 82.41 87.30 92.50 98.00
3 164.82 174.60 185.00 196.00
4 329.64 349.20 370.00 392.00
5 659.28 698.40 740.00 784.00
6 1318.6 1396.8 1480.0 1568.0
7 2637.1 2793.6 2960.0 3136.0
8 5274.2 5587.2 5920.0 6272.0
G # A-A # B
1 51.91 55.00 58.27 61.73
2 103.82 110.00 116.54 123.46
3 207.64 220.00 233.08 246.92
4 415.28 440.00 466.16 493.84
5 830.56 880.00 932.32 987.68
6 1661.1 1760.0 1864.6 1975.4
7 3322.2 3520.0 3729.3 3950.7
8 6644.5 7040.0 7458.6 7901.4
2. METHOD OF CALCULATION OF CONSTANTS
The required frequency of sound in the co-processor is
obtained as follows:
F (note) = F (tact) / 12/Const;
(F (tact) = 1750000Gts.)
Hence: Const = F (tact) / 1912 / F (note).
It now remains only to substitute in
formula and obtain the required values
constant at the desired frequency.
Attention! To achieve greater accuracy in the calculations,
the resulting constant ROUND need, not only to take her whole
part!
*
Perhaps after reading this epistle, the world
Many musicians will reflect on this issue, and napisateli
editors wound on your mustache, and will no longer take the
constant of the editors, written by somewhere behind the hill.
Good luck!
