Difference between revisions of "NoteFreq"

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(Adds noteFreq and entire frequency note table in the standard MIDI range. (Please don't ask how long this took...))
 
(added example for controlling pitch of digitized instrument)
 
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<c>NoteFreq</c> is a public function that returns a specific frequency from a note table.
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<c>noteFreq</c> is a public function that calculates the correct frequency for a given note.  Notes are specified by [https://www.inspiredacoustics.com/en/MIDI_note_numbers_and_center_frequencies 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).
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== Usage Notes ==
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Use the result of the `noteFreq` call as the <c>frequency</c> parameter to [[Sound.init]] (or assign it to [[Sound.freq]].  Assuming the [[Sound.waveform|waveform]] of the sound is a single cycle, the resulting sound will have the correct pitch for the note value passed to <c>noteFreq</c>.
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It may also be used with digitized sounds, particularly when for digitized instruments.  In this case, divide the <c>noteFreq</c> of the desired note by the <c>noteFreq</c> of the note for which the instrument was recorded (typically 60, middle C).  Then use the resulting factor as the <c>pitch</c> parameter to [[Sound.play]].
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== Example ==
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This example plays a synthesized middle C for 1 second.
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<ms>snd = new Sound
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snd.init 1, noteFreq(60)
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snd.play</ms>
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The following example loads a digitized instrument (cello), plays it at its original pitch of middle C, and then plays it again as note 67 (middle G).
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<ms>snd = file.loadSound("/sys/sounds/celloLongC4.wav")
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snd.play  // plays as note 60 (C4)
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snd.play 1, 0, noteFreq(67)/noteFreq(60)  // plays as note 67 (G4)</ms>
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== Value Table ==
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The table below shows notes and frequency values for all 127 standard MIDI notes.  However, the <c>noteFreq</c> function also accepts non-integer values, making off-pitch notes as desired.
  
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
! Value !! Note !! Frequency
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! Note Number !! Musical Note !! Frequency
 
|-
 
|-
 
! 0 !! C<sub>-1</sub> !! 8.1758
 
! 0 !! C<sub>-1</sub> !! 8.1758

Latest revision as of 22:39, 31 July 2020

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 Notes

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.

It may also be used with digitized sounds, particularly when for digitized instruments. In this case, divide the noteFreq of the desired note by the noteFreq of the note for which the instrument was recorded (typically 60, middle C). Then use the resulting factor as the pitch parameter to Sound.play.

Example

This example plays a synthesized middle C for 1 second.

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

The following example loads a digitized instrument (cello), plays it at its original pitch of middle C, and then plays it again as note 67 (middle G).

snd = file.loadSound("/sys/sounds/celloLongC4.wav")
snd.play  // plays as note 60 (C4)
snd.play 1, 0, noteFreq(67)/noteFreq(60)  // plays as note 67 (G4)


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.