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.