56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
#include <stdio.h>
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#include <math.h>
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static float note_frequencies[9][12]={
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/* C C# D D# E F F# G G# A A# B */
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{16.35, 17.32, 18.35, 19.45, 20.60, 21.83, 23.12, 24.50, 25.96, 27.50, 29.14, 30.87},
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{32.70, 34.65, 36.71, 38.89, 41.20, 43.65, 46.25, 49.00, 51.91, 55.00, 58.27, 61.74},
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{65.41, 69.30, 73.42, 77.78, 82.41, 87.31, 92.50, 98.00, 103.8, 110.0, 116.5, 123.5},
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{130.8, 138.6, 146.8, 155.6, 164.8, 174.6, 185.0, 196.0, 207.7, 220.0, 233.1, 246.9},
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{261.6, 277.2, 293.7, 311.1, 329.6, 349.2, 370.0, 392.0, 415.3, 440.0, 466.2, 493.9},
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{523.3, 554.4, 587.3, 622.3, 659.3, 698.5, 740.0, 784.0, 830.6, 880.0, 932.3, 987.8},
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{1047, 1109, 1175, 1245, 1319, 1397, 1480, 1568, 1661, 1760, 1865, 1976},
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{2093, 2217, 2349, 2489, 2637, 2794, 2960, 3136, 3322, 3520, 3729, 3951},
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{4186, 4435, 4699, 4978, 5274, 5588, 5920, 6272, 6645, 7040, 7459, 7902},
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};
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static char note_names[12][12]={
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"C","CSHARP","D","DSHARP","E","F","FSHARP","G","GSHARP","A","ASHARP","B",
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};
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int main(int argc, char **argv) {
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int f,o;
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float value,actual;
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char temp_string[50];
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for(o=3;o<7;o++) {
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for(f=0;f<12;f++) {
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// freq = 1/((20v+17)*1.023e-6)
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// ((20v+17)*1.023e-6)= 1/freq
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// 20v*1.023e-6 + 17*1.023e-6 = 1/freq
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// 20v*1.023e-6 = (1/freq)-17*1.023e-6)
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// v = ((1/freq)-17*1.023e-6)/(20*1.023e-6)
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value=(1.0/(
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(20.0*(1.023e-6)*note_frequencies[o][f])-
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17*1.023e-6
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));
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actual=1.0/((20.0*value+17)*1.023e-6);
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// value = ((1.0/note_frequencies[o][f])-17.0*1.023e-6)/
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// 20.0*1.023e-6;
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snprintf(temp_string,50,"NOTE_%s%1d",
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note_names[f],o);
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printf("%-12s = %d\t; %.1f (%.1f)\n",
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temp_string,(int)round(value),
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actual,note_frequencies[o][f]);
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}
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}
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return 0;
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}
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