# Difference between revisions of "NoteFreq"

`noteFreq` is a public function that calculates the correct frequency for a given note. Notes are specified by MIDI note number, where 60 is middle C, and there are 12 notes per octave. Thus 61 is middle C#, 62 is D above middle C, and 72 (12 values above 60) is "high C" (one octave above middle C).

### Usage

Use the result of the `noteFreq` call as the `frequency` parameter to Sound.init (or assign it to Sound.freq. Assuming the waveform of the sound is a single cycle, the resulting sound will have the correct pitch for the note value passed to `noteFreq`.

### Example

This example plays middle C for 1 second.

```snd = new Sound
snd.init 1, noteFreq(60)
snd.play
```

### Value Table

The table below shows notes and frequency values for all 127 standard MIDI notes. However, the `noteFreq` function also accepts non-integer values, making off-pitch notes as desired.

Note Number Musical Note Frequency
0 C-1 8.1758
1 C#-1 8.6620
2 D-1 9.1770
3 D#-1 9.7227
4 E-1 10.301
5 F-1 10.914
6 F#-1 11.563
7 G-1 12.250
8 G#-1 12.979
9 A-1 13.750
10 A#-1 14.568
11 B-1 15.434
12 C0 16.352
13 C#0 17.324
14 D0 18.354
15 D#0 19.445
16 E0 20.602
17 F0 21.827
18 F#0 23.125
19 G0 24.500
20 G#0 25.957
21 A0 27.500
22 A#0 29.135
23 B0 30.868
24 C1 32.703
25 C#1 34.648
26 D1 36.708
27 D#1 38.891
28 E1 41.203
29 F1 43.654
30 F#1 46.249
31 G1 48.999
32 G#1 51.913
33 A1 55.000
34 A#1 58.270
35 B1 61.735
36 C2 65.406
37 C#2 69.296
38 D2 73.416
39 D#2 77.782
40 E2 82.407
41 F2 87.307
42 F#2 92.499
43 G2 97.999
44 G#2 103.83
45 A2 110.00
46 A#2 116.54
47 B2 123.47
48 C3 130.81
49 C#3 138.59
50 D3 146.83
51 D#3 155.56
52 E3 164.81
53 F3 174.61
54 F#3 185.00
55 G3 196.00
56 G#3 207.65
57 A3 220.00
58 A#3 233.08
59 B3 246.94
60 Middle C4 261.63
61 C#4 277.18
62 D4 293.66
63 D#4 311.13
64 E4 329.63
65 F4 349.23
66 F#4 369.99
67 G4 392.00
68 G#4 415.30
69 A4 440.00
70 A#4 466.16
71 B4 193.88
72 C5 523.25
73 C#5 554.37
74 D5 587.33
75 D#5 622.25
76 E5 659.26
77 F5 698.46
78 F#5 739.99
79 G5 783.99
80 G#5 830.61
81 A5 880.00
82 A#5 932.33
83 B5 987.77
84 C6 1046.5
85 C#6 1108.7
86 D6 1174.7
87 D#6 1244.5
88 E6 1318.5
89 F6 1396.6
90 F#6 1480.0
91 G6 1568.0
92 G#6 1661.2
93 A6 1760.0
94 A#6 1864.7
95 B6 1975.5
96 C7 2093.0
97 C#7 2217.5
98 D7 2349.3
99 D#7 2489.0
100 E7 2637.0
101 F7 2793.8
102 F#7 2960.0
103 G7 3136.0
104 G#7 3322.4
105 A7 3520.0
106 A#7 3729.3
107 B7 3951.1
108 C8 4186.0
109 C#8 4434.9
110 D8 4698.6
111 D#8 4978.0
112 E8 5274.0
113 F8 5587.7
114 F#8 5919.9
115 G8 6271.9
116 G#8 6644.9
117 A8 7040.0
118 A#8 7458.6
119 B8 7902.1
120 C9 8372.0
121 C#9 8869.8
122 D9 9697.3
123 D#9 9956.1
124 E9 10548
125 F9 11175
126 F#9 11840
127 G9 12544

Table is in Scientific Pitch Notation.