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Play a Musical Note (Python)

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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/

# play a note of a given frequency and duration via the PC sound card
# needs Python module  tkSnack  developed at KTH in Stockholm, Sweden
# free download: snack229-py.zip
# from: http://www.speech.kth.se/snack/
# on my system I copied tkSnack.py to D:\Python24\Lib and the folder snacklib to D:\Python24\tcl
# tested with Python24     vegaseat     28oct2005

"""
Frequency Note Table:
  Frequency   Note   MIDI#
    27.5000    A0     21
    29.1352    A#0    22
    30.8677    B0     23
    32.7032    C1     24
    34.6478    C#1    25   # C#1 = C1 * 1.059463094
    36.7081    D1     26   # 1.059463094 = 12th root of 2
    38.8909    D#1    27
    41.2034    E1     28
    43.6535    F1     29
    46.2493    F#1    30
    48.9994    G1     31
    51.9131    G#1    32
    55.0000    A1     33
    58.2705    A#1    34
    61.7354    B1     35
    65.4064    C2     36
    69.2957    C#2    37
    73.4162    D2     38
    77.7817    D#2    39
    82.4069    E2     40
    87.3071    F2     41
    92.4986    F#2    42
    97.9989    G2     43
   103.8262    G#2    44
   110.0000    A2     45
   116.5409    A#2    46
   123.4708    B2     47
   130.8128    C3     48
   138.5913    C#3    49
   146.8324    D3     50
   155.5635    D#3    51
   164.8138    E3     52
   174.6141    F3     53
   184.9972    F#3    54
   195.9977    G3     55
   207.6523    G#3    56
   220.0000    A3     57
   233.0819    A#3    58
   246.9417    B3     59
   261.6256    C4     60
   277.1826    C#4    61
   293.6648    D4     62
   311.1270    D#4    63
   329.6276    E4     64
   349.2282    F4     65
   369.9944    F#4    66
   391.9954    G4     67
   415.3047    G#4    68
   440.0000    A4     69
   466.1638    A#4    70
   493.8833    B4     71
   523.2511    C5     72
   554.3653    C#5    73
   587.3295    D5     74
   622.2540    D#5    75
   659.2551    E5     76
   698.4565    F5     77
   739.9888    F#5    78
   783.9909    G5     79
   830.6094    G#5    80
   880.0000    A5     81
   932.3275    A#5    82
   987.7666    B5     83
  1046.5023    C6     84
  1108.7305    C#6    85
  1174.6591    D6     86
  1244.5079    D#6    87
  1318.5102    E6     88
  1396.9129    F6     89
  1479.9777    F#6    90
  1567.9817    G6     91
  1661.2188    G#6    92
  1760.0000    A6     93
  1864.6550    A#6    94
  1975.5332    B6     95
  2093.0045    C7     96
  2217.4610    C#7    97
  2349.3181    D7     98
  2489.0159    D#7    99
  2637.0205    E7    100
  2793.8259    F7    101
  2959.9554    F#7   102
  3135.9635    G7    103
  3322.4376    G#7   104
  3520.0000    A7    105
  3729.3101    A#7   106
  3951.0664    B7    107
  4186.0090    C8    108
"""

import Tkinter
import tkSnack

def setVolume(volume=50):
    """set the volume of the sound system"""
    if volume > 100:
        volume = 100
    elif volume < 0:
        volume = 0
    tkSnack.audio.play_gain(volume)

def playNote(freq, duration):
    """play a note of freq (hertz) for duration (seconds)"""
    snd = tkSnack.Sound()
    filt = tkSnack.Filter('generator', freq, 30000, 0.0, 'sine', int(11500*duration))
    snd.stop()
    snd.play(filter=filt, blocking=1)

def soundStop():
    """stop the sound the hard way"""
    try:
        root = root.destroy()
        filt = None
    except:
        pass
    
    
root = Tkinter.Tk()
    
# have to initialize the sound system, required!!
tkSnack.initializeSnack(root)
# set the volume of the sound system (0 to 100%)
setVolume(30)
# play a note of requency 440 hertz (A4) for a duration of 5 seconds
playNote(440, 5)
# play a note of requency 261.6 hertz (C4) for a duration of 5 seconds
playNote(261.6, 5)
# optional
soundStop()
    
root.withdraw()
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Alex Sarria
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2 posts since Sep 2010
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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?

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vegaseat
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On Linux you have to install tkSnack into directories that Python is looking into.

# show the system path for Python = PYTHONPATH

import sys
print sys.path
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Layra
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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.

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Gribouillis
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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.

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vegaseat
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See:
"Getting tkSnack sound module to work with Python3"
http://www.daniweb.com/software-development/python/code/357467

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Layra
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See:
"Getting tkSnack sound module to work with Python3"
http://www.daniweb.com/software-development/python/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!

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