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Sound visualizer in C#

, 15 Aug 2007 GPL3 444.3K 23.9K 216
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Simple sound sampler with visualization
Screenshot - SoundViewer.jpg


This project demonstrates the use of the Fast Fourier Transform and Windows GDI to produce near real-time visualizations of the time and frequency domains of sound.


While looking for information on signal processing for a robotics project, it became apparent that examples written in C# were hard to find. This led me to create some of my own classes, which I have provided here for this demonstration.

Using the Code

Audio input for this demonstration is provided by the Wave classes developed by Ianier Munoz. Wave samples are further processed using the AudioFrame class.

class AudioFrame
    private Bitmap _canvasTimeDomain;
    private Bitmap _canvasFrequencyDomain;
    private double[] _waveLeft;
    private double[] _waveRight;
    private double[] _fftLeft;
    private double[] _fftRight;
    private SignalGenerator _signalGenerator;
    private bool _isTest = false;
    public AudioFrame(bool isTest)
        _isTest = isTest;

    /// <span class="code-SummaryComment"><summary>


This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)


About the Author

Jeff Morton
Systems / Hardware Administrator
United States United States
No Biography provided

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Comments and Discussions

GeneralProb with the frequency domain Pin
joeblogg6-Jan-11 8:03
memberjoeblogg6-Jan-11 8:03 
GeneralRe: Prob with the frequency domain Pin
Piligrim200729-Jan-11 5:31
memberPiligrim200729-Jan-11 5:31 
QuestionHow to get the frequency in real-time? Pin
gmajkun22-Dec-10 19:54
groupgmajkun22-Dec-10 19:54 
AnswerRe: How to get the frequency in real-time? Pin
Piligrim200729-Jan-11 5:37
memberPiligrim200729-Jan-11 5:37 
GeneralMy vote of 5 Pin
Dennis Betten3-Nov-10 1:41
memberDennis Betten3-Nov-10 1:41 
GeneralError Pin
dreje20105-Oct-10 23:53
memberdreje20105-Oct-10 23:53 
QuestionDoes this analyse the code with in milisecond accurancy? Pin
Rahdu15-Sep-10 9:50
memberRahdu15-Sep-10 9:50 
GeneralDetect Peak on single channel Pin
survcopt5-Mar-10 3:47
membersurvcopt5-Mar-10 3:47 
Questionhow can I determine the sound level without waveFormat ? Pin
fasialkk24-Feb-10 13:44
memberfasialkk24-Feb-10 13:44 
QuestionHow To Open Recorded Wav File Pin
TV Mogul14-Jan-10 2:38
memberTV Mogul14-Jan-10 2:38 
Generalimportant reguest Pin
seka2087-Dec-09 22:04
memberseka2087-Dec-09 22:04 
QuestionDoes not work in Windows 7 (64bit) Why? Pin
a.mueller2-Dec-09 5:31
membera.mueller2-Dec-09 5:31 
AnswerRe: Does not work in Windows 7 (64bit) Why? Pin
eweewf15-Feb-10 8:42
membereweewf15-Feb-10 8:42 
64-Bit should be the first clue. :P

Didn't work on my Windows Server 2008, 64-Bit either. Then I thought that winmm.dll must be a 32-Bit dll. As a result, any application using 32-bit DLL files needs to change it's configuration, or exceptions will occur...

Visual Studio 2008

Click the "Build" -> "Configuration Manager..." menu option. Click the "Active solution platform" drop-down menu and select "New...". A dialog will open, change the type to "x86", click "OK", and rebuild. Smile | :)
QuestionIs this available in VB.NET? Pin
Simon Williamson2-Apr-09 1:21
memberSimon Williamson2-Apr-09 1:21 
GeneralMedia file Pin
Babgi26-Mar-09 9:19
memberBabgi26-Mar-09 9:19 
GeneralRe: Media file Pin
gamosemalaka30-May-09 22:00
membergamosemalaka30-May-09 22:00 
GeneralRe: Media file Pin
diogopms27-Jun-09 15:37
memberdiogopms27-Jun-09 15:37 
GeneralRe: Media file Pin
Ankur Dukare11-Mar-10 22:34
memberAnkur Dukare11-Mar-10 22:34 
GeneralRe: Media file Pin
gerardo_00115-Mar-10 8:15
membergerardo_00115-Mar-10 8:15 
QuestionWhere is the Documentation? Pin
Member 603819619-Mar-09 7:37
memberMember 603819619-Mar-09 7:37 
QuestionaudioFrameSize in waveformat correct ? Pin
radio_gaga8-Mar-09 8:16
memberradio_gaga8-Mar-09 8:16 
AnswerRe: audioFrameSize in waveformat correct ? Pin
Jeff Morton8-Mar-09 9:59
memberJeff Morton8-Mar-09 9:59 
GeneralIt won't work on desktop PC Pin
max_99014-Feb-09 0:15
membermax_99014-Feb-09 0:15 
QuestionInput delays Pin
Joe Wright1-Sep-08 7:12
memberJoe Wright1-Sep-08 7:12 
AnswerRe: Input delays Pin
Jeff Morton1-Sep-08 12:45
memberJeff Morton1-Sep-08 12:45 

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