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Oct 10th, 2004
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Create Sound

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HI there guys any one know how to create the correct tone for the sound using c++? i manage to know the basic only


c 262
d294
e 330
f 349
f 392
a 440
b 494
c2 524
This is from a handphone ringing tone
how do i know the frequency for like 8-8a2,c4,c5 8#a2,8-

anyone have any idea?

sound(262);
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johnsonkek is offline Offline
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Oct 10th, 2004
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Re: Create Sound

I dusted off this little code snippet from the good old DOS days. It will answer some of your questions on how to calculate the musical scales. If you need any more details, get friendly with a musician!

C++ Syntax (Toggle Plain Text)
  1. /***********************  play.c  ***********************
  2. **
  3. **   Experimentation with sound:
  4. **     play(int octave,int note,int duration)
  5. **   Written in Turbo C V.2.0 by vegaseat 6/15/88
  6. **
  7. *********************************************************/
  8.  
  9. /**************  note.h  ***********/
  10.  
  11. #define P     0   /* pause */
  12. #define C     1
  13. #define CS    2   /* C sharp */
  14. #define D     3
  15. #define DS    4
  16. #define E     5
  17. #define F     6
  18. #define FS    7
  19. #define G     8
  20. #define GS    9
  21. #define A    10
  22. #define AS   11
  23. #define B    12
  24.  
  25. #define EN   75   /* eighth note  */
  26. #define QN  150   /* quarter note */
  27. #define HN  300   /* half note    */
  28. #define FN  600   /* full note    */
  29.  
  30. /************************************/
  31.  
  32. void play(int octave,int note,int duration);
  33. void british(void);   /* Westminster Bells */
  34.  
  35. void main(void)       /* test play() */
  36. {
  37.   british();
  38.   getch();
  39. }
  40.  
  41. void play(int octave,int note,int duration)
  42. /* play note (C=1 to B=12), in octave (1-8), and duration (msec)
  43.    include NOTE.H for note values */
  44. {
  45.   int k;
  46.   double frequency;
  47.  
  48.   if (note == 0) {                  /* pause */
  49.     delay(duration);
  50.     return;
  51.   }
  52.   frequency = 32.625;
  53.   for (k = 0; k < octave; k++)      /* compute C in octave  */
  54.     frequency *= 2;
  55.   for (k = 0; k < note; k++)        /* frequency of note    */
  56.     frequency *= 1.059463094;       /* twelve root of 2     */
  57.   delay(5);                         /* delay between keys   */
  58.   sound((int) frequency);           /* sound the note       */
  59.   delay(duration);                  /* for correct duration */
  60.   nosound();
  61. }
  62.  
  63. void british(void)   /* Westminster Bells, sort of */
  64. {
  65.   play(4,E,HN);
  66.   play(4,C,HN);
  67.   play(4,D,HN);
  68.   play(3,G,HN+QN); play(3,P,QN);
  69.   play(3,G,HN);
  70.   play(4,D,HN);
  71.   play(4,E,HN);
  72.   play(4,C,HN+QN);
  73. }
  74.  
  75. /*
  76. For XP/NT that don't allow port outputs there is a WIN32 API call:
  77.  
  78. The Beep function generates simple tones on the speaker. The function 
  79. is synchronous; it does not return control to its caller until the 
  80. sound finishes. 
  81.  
  82. BOOL Beep(
  83.  
  84.     DWORD dwFreq,	// sound frequency, in hertz 
  85.     DWORD dwDuration 	// sound duration, in milliseconds 
  86.    );
  87.  
  88. */
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vegaseat is offline Offline
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Oct 11th, 2004
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Re: Create Sound

erm sorry but i still not very sure how u calculate the value this the the program i type just that i'm short of music that all.By the way thank u very for ur effort to reply my message.
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Oct 13th, 2004
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Re: Create Sound

It is not that difficult and even though I am a musician you don't really need to be one just to determine the frequency of each musical note.

First, c,d,e,f,g,a,b are not all the musical notes that exist in the eastern music system, in fact there are twelve different notes (see those black keys in a piano keyboard?) and they are:
a, a#, b, c, c#, d, d#, e, f, f#, g, g#

Second, the american standard pitch states that the note A has a frequency of 440, and this is the point of reference to determine every other note.

The third part is just mathematics, and it is a simple formula: The frequency of the subsequent note equals the current note multiplied by the 12th root of 2 (the 12th root of 2 can also be expresed as 2 elevated at 1/12, or 2^(1/12)). So with this formula let's make an example: suppose you already have the note A which is 440 and you want to determine the next note which is A#, the mathematical notation is:

A# = A * (2^(1/12))
which is 440 * (2^(1/12)) and equals 466.1637...

following this sequence:
B = A# * (2^(1/12))
C = B * (2^(1/12))
C# = C * (2^(1/12))
and so on.....

You'll get a lot of decimal numbers in all of the notes (except of all A's) and the good news is that you can round to the nearest integer as this difference is imperceptible to the human ear.

Now, what happens to all the notes below A 440???? It is very easy, you just need to use the same formula, except that instead of multiplying you need to divide, for example, to get the note before A:

G# = A / (2^(1/12))

Now you can get any range of notes you want in any scale. Note that this approach requires you to obtain all the notes in a sequential mode. If you want to get a note directly from A 440 you tweak the formula a little bit. Let's say you want to obtain the next F after A 440, F would be the 8th note after A, so you multiply by the 12th root of 2 elevated at the number of steps after the current note, in this case eight. So:

F = A * (2^(1/12))^8

I hope this helps, and sorry if my english is not that good since I'm from Mexico.
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Re: Create Sound

Sounds like you got lost with the calculations of the notes of the musical scale I gave you in my sample code. Well here is a table of notes and associated frequencies:
C++ Syntax (Toggle Plain Text)
  1.    Frequency   Note   MIDI#
  2.  
  3.      8.1758            0
  4.      8.6620            1
  5.      9.1770            2
  6.      9.7227            3
  7.     10.3009            4
  8.     10.9134            5
  9.     11.5623            6
  10.     12.2499            7
  11.     12.9783            8
  12.     13.7500            9
  13.     14.5676           10
  14.     15.4339           11
  15.     16.3516           12
  16.     17.3239           13
  17.     18.3540           14
  18.     19.4454           15
  19.     20.6017           16
  20.     21.8268           17
  21.     23.1247           18
  22.     24.4997           19
  23.     25.9565           20
  24.     27.5000    A0     21
  25.     29.1352    A#0    22
  26.     30.8677    B0     23
  27.     32.7032    C1     24
  28.     34.6478    C#1    25
  29.     36.7081    D1     26
  30.     38.8909    D#1    27
  31.     41.2034    E1     28
  32.     43.6535    F1     29
  33.     46.2493    F#1    30
  34.     48.9994    G1     31
  35.     51.9131    G#1    32
  36.     55.0000    A1     33
  37.     58.2705    A#1    34
  38.     61.7354    B1     35
  39.     65.4064    C2     36
  40.     69.2957    C#2    37
  41.     73.4162    D2     38
  42.     77.7817    D#2    39
  43.     82.4069    E2     40
  44.     87.3071    F2     41
  45.     92.4986    F#2    42
  46.     97.9989    G2     43
  47.    103.8262    G#2    44
  48.    110.0000    A2     45
  49.    116.5409    A#2    46
  50.    123.4708    B2     47
  51.    130.8128    C3     48
  52.    138.5913    C#3    49
  53.    146.8324    D3     50
  54.    155.5635    D#3    51
  55.    164.8138    E3     52
  56.    174.6141    F3     53
  57.    184.9972    F#3    54
  58.    195.9977    G3     55
  59.    207.6523    G#3    56
  60.    220.0000    A3     57
  61.    233.0819    A#3    58
  62.    246.9417    B3     59
  63.    261.6256    C4     60
  64.    277.1826    C#4    61
  65.    293.6648    D4     62
  66.    311.1270    D#4    63
  67.    329.6276    E4     64
  68.    349.2282    F4     65
  69.    369.9944    F#4    66
  70.    391.9954    G4     67
  71.    415.3047    G#4    68
  72.    440.0000    A4     69
  73.    466.1638    A#4    70
  74.    493.8833    B4     71
  75.    523.2511    C5     72
  76.    554.3653    C#5    73
  77.    587.3295    D5     74
  78.    622.2540    D#5    75
  79.    659.2551    E5     76
  80.    698.4565    F5     77
  81.    739.9888    F#5    78
  82.    783.9909    G5     79
  83.    830.6094    G#5    80
  84.    880.0000    A5     81
  85.    932.3275    A#5    82
  86.    987.7666    B5     83
  87.   1046.5023    C6     84
  88.   1108.7305    C#6    85
  89.   1174.6591    D6     86
  90.   1244.5079    D#6    87
  91.   1318.5102    E6     88
  92.   1396.9129    F6     89
  93.   1479.9777    F#6    90
  94.   1567.9817    G6     91
  95.   1661.2188    G#6    92
  96.   1760.0000    A6     93
  97.   1864.6550    A#6    94
  98.   1975.5332    B6     95
  99.   2093.0045    C7     96
  100.   2217.4610    C#7    97
  101.   2349.3181    D7     98
  102.   2489.0159    D#7    99
  103.   2637.0205    E7    100
  104.   2793.8259    F7    101
  105.   2959.9554    F#7   102
  106.   3135.9635    G7    103
  107.   3322.4376    G#7   104
  108.   3520.0000    A7    105
  109.   3729.3101    A#7   106
  110.   3951.0664    B7    107
  111.   4186.0090    C8    108
  112.   4434.9221          109
  113.   4698.6363          110
  114.   4978.0317          111
  115.   5274.0409          112
  116.   5587.6517          113
  117.   5919.9108          114
  118.   6271.9270          115
  119.   6644.8752          116
  120.   7040.0000          117
  121.   7458.6202          118
  122.   7902.1328          119
  123.   8372.0181          120
  124.   8869.8442          121
  125.   9397.2726          122
  126.   9956.0635          123
  127.  10548.0818          124
  128.  11175.3034          125
  129.  11839.8215          126
  130.  12543.8540          127

Trying to get fancy, hope it worked.
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