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Play a Musical Note (Python)

by on Oct 28th, 2005
You need the Python tkSnack module to play notes of a given frequency and duration on your external sound system (attached to the PC's sound card). The code snippet gives just a tiny hint about the capabilities of tkSnack. It works with Tkinter, normally part of the Python installation. The module comes to you courtesy of the researchers at KTH and the University of Stockholm in Sweden. More information is at their website http://www.speech.kth.se/snack/
Python Code Snippet (Toggle Plain Text) 
  1. # play a note of a given frequency and duration via the PC sound card
  2. # needs Python module  tkSnack  developed at KTH in Stockholm, Sweden
  3. # free download: snack229-py.zip
  4. # from: http://www.speech.kth.se/snack/
  5. # on my system I copied tkSnack.py to D:\Python24\Lib and the folder snacklib to D:\Python24\tcl
  6. # tested with Python24     vegaseat     28oct2005
  7.  
  8. """
  9. Frequency Note Table:
  10.   Frequency   Note   MIDI#
  11.     27.5000    A0     21
  12.     29.1352    A#0    22
  13.     30.8677    B0     23
  14.     32.7032    C1     24
  15.     34.6478    C#1    25   # C#1 = C1 * 1.059463094
  16.     36.7081    D1     26   # 1.059463094 = 12th root of 2
  17.     38.8909    D#1    27
  18.     41.2034    E1     28
  19.     43.6535    F1     29
  20.     46.2493    F#1    30
  21.     48.9994    G1     31
  22.     51.9131    G#1    32
  23.     55.0000    A1     33
  24.     58.2705    A#1    34
  25.     61.7354    B1     35
  26.     65.4064    C2     36
  27.     69.2957    C#2    37
  28.     73.4162    D2     38
  29.     77.7817    D#2    39
  30.     82.4069    E2     40
  31.     87.3071    F2     41
  32.     92.4986    F#2    42
  33.     97.9989    G2     43
  34.    103.8262    G#2    44
  35.    110.0000    A2     45
  36.    116.5409    A#2    46
  37.    123.4708    B2     47
  38.    130.8128    C3     48
  39.    138.5913    C#3    49
  40.    146.8324    D3     50
  41.    155.5635    D#3    51
  42.    164.8138    E3     52
  43.    174.6141    F3     53
  44.    184.9972    F#3    54
  45.    195.9977    G3     55
  46.    207.6523    G#3    56
  47.    220.0000    A3     57
  48.    233.0819    A#3    58
  49.    246.9417    B3     59
  50.    261.6256    C4     60
  51.    277.1826    C#4    61
  52.    293.6648    D4     62
  53.    311.1270    D#4    63
  54.    329.6276    E4     64
  55.    349.2282    F4     65
  56.    369.9944    F#4    66
  57.    391.9954    G4     67
  58.    415.3047    G#4    68
  59.    440.0000    A4     69
  60.    466.1638    A#4    70
  61.    493.8833    B4     71
  62.    523.2511    C5     72
  63.    554.3653    C#5    73
  64.    587.3295    D5     74
  65.    622.2540    D#5    75
  66.    659.2551    E5     76
  67.    698.4565    F5     77
  68.    739.9888    F#5    78
  69.    783.9909    G5     79
  70.    830.6094    G#5    80
  71.    880.0000    A5     81
  72.    932.3275    A#5    82
  73.    987.7666    B5     83
  74.   1046.5023    C6     84
  75.   1108.7305    C#6    85
  76.   1174.6591    D6     86
  77.   1244.5079    D#6    87
  78.   1318.5102    E6     88
  79.   1396.9129    F6     89
  80.   1479.9777    F#6    90
  81.   1567.9817    G6     91
  82.   1661.2188    G#6    92
  83.   1760.0000    A6     93
  84.   1864.6550    A#6    94
  85.   1975.5332    B6     95
  86.   2093.0045    C7     96
  87.   2217.4610    C#7    97
  88.   2349.3181    D7     98
  89.   2489.0159    D#7    99
  90.   2637.0205    E7    100
  91.   2793.8259    F7    101
  92.   2959.9554    F#7   102
  93.   3135.9635    G7    103
  94.   3322.4376    G#7   104
  95.   3520.0000    A7    105
  96.   3729.3101    A#7   106
  97.   3951.0664    B7    107
  98.   4186.0090    C8    108
  99. """
  100.  
  101. import Tkinter
  102. import tkSnack
  103.  
  104. def setVolume(volume=50):
  105.     """set the volume of the sound system"""
  106.     if volume > 100:
  107.         volume = 100
  108.     elif volume < 0:
  109.         volume = 0
  110.     tkSnack.audio.play_gain(volume)
  111.  
  112. def playNote(freq, duration):
  113.     """play a note of freq (hertz) for duration (seconds)"""
  114.     snd = tkSnack.Sound()
  115.     filt = tkSnack.Filter('generator', freq, 30000, 0.0, 'sine', int(11500*duration))
  116.     snd.stop()
  117.     snd.play(filter=filt, blocking=1)
  118.  
  119. def soundStop():
  120.     """stop the sound the hard way"""
  121.     try:
  122.         root = root.destroy()
  123.         filt = None
  124.     except:
  125.         pass
  126.  
  127.  
  128. root = Tkinter.Tk()
  129.  
  130. # have to initialize the sound system, required!!
  131. tkSnack.initializeSnack(root)
  132. # set the volume of the sound system (0 to 100%)
  133. setVolume(30)
  134. # play a note of requency 440 hertz (A4) for a duration of 5 seconds
  135. playNote(440, 5)
  136. # play a note of requency 261.6 hertz (C4) for a duration of 5 seconds
  137. playNote(261.6, 5)
  138. # optional
  139. soundStop()
  140.  
  141. root.withdraw()
Comments on this Code Snippet
Permalink
Sep 12th, 2010
0

Re: Play a Musical Note (Python)

Firs at all, I'm sorry: my English is not good. I'm using Ubuntu Linux 10.04 and downloaded tkSnack without problem but, after running your code, appears an error: "UNRESOLVED IMPORT: tkSnack". Please, What should I do?
Newbie Poster
Alex Sarria is offline Offline
2 posts
since Sep 2010
Permalink
Sep 13th, 2010
0

Re: Play a Musical Note (Python)

On Linux you have to install tkSnack into directories that Python is looking into.
Python Syntax (Toggle Plain Text)
  1. # show the system path for Python = PYTHONPATH
  2.  
  3. import sys
  4. print sys.path
DaniWeb's Hypocrite
vegaseat is offline Offline
5,792 posts
since Oct 2004
Permalink
May 12th, 2011
0

Re: Play a Musical Note (Python)

I went and looked up the tksnack from the website posted and the latest version is for Python 2.2. Considering Python latest is 3.1, will this library still work? I'm very interested in this for my final project and would prefer to use this or something similar / more up to date.

Thanks.
Newbie Poster
Layra is offline Offline
2 posts
since May 2011
Permalink
May 12th, 2011
1

Re: Play a Musical Note (Python)

Click to Expand / Collapse  Quote originally posted by Layra ...
I went and looked up the tksnack from the website posted and the latest version is for Python 2.2. Considering Python latest is 3.1, will this library still work? I'm very interested in this for my final project and would prefer to use this or something similar / more up to date.

Thanks.
Apparently, a very small part of snack is written in python (20k) and this part contains basic interaction with tkinter, so if it does not work with python 3, it should be relatively easy to adapt it. On the snack site http://www.speech.kth.se/snack/ there is a link to another program called WaveSurfer http://www.speech.kth.se/wavesurfer/ which uses snack and which last release was 1 month ago. Wavesurfer is described in this wikipedia page http://en.wikipedia.org/wiki/WaveSurfer, and apparently wavesurfer accepts plugins (in python ? it's worth exploring this direction).
Anyway, the existence of wavesurfer proves that snack still works in 2011.
Last edited by Gribouillis; May 12th, 2011 at 1:06 pm.
Posting Maven
Gribouillis is offline Offline
2,656 posts
since Jul 2008
Permalink
May 12th, 2011
1

Re: Play a Musical Note (Python)

See:
"Getting tkSnack sound module to work with Python3"
http://www.daniweb.com/software-deve...on/code/357467
DaniWeb's Hypocrite
vegaseat is offline Offline
5,792 posts
since Oct 2004
Permalink
May 12th, 2011
0

Re: Play a Musical Note (Python)

Click to Expand / Collapse  Quote originally posted by vegaseat ...
See:
"Getting tkSnack sound module to work with Python3"
http://www.daniweb.com/software-deve...on/code/357467
Yep, I just found this link -- thank's for the confirmation! Now only to get the environment setup correctly and I'll be all set. Thanks a bunch to both of you!
Newbie Poster
Layra is offline Offline
2 posts
since May 2011
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