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Sound visualizer in C#

, 15 Aug 2007 GPL3
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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

GeneralRe: Media file Pin
Ankur Dukare11-Mar-10 23:34
memberAnkur Dukare11-Mar-10 23:34 
GeneralRe: Media file Pin
gerardo_00115-Mar-10 9:15
membergerardo_00115-Mar-10 9:15 
QuestionWhere is the Documentation? Pin
Member 603819619-Mar-09 8:37
memberMember 603819619-Mar-09 8:37 
QuestionaudioFrameSize in waveformat correct ? Pin
radio_gaga8-Mar-09 9:16
memberradio_gaga8-Mar-09 9:16 
AnswerRe: audioFrameSize in waveformat correct ? Pin
Jeff Morton8-Mar-09 10:59
memberJeff Morton8-Mar-09 10:59 
GeneralIt won't work on desktop PC Pin
max_99014-Feb-09 1:15
membermax_99014-Feb-09 1:15 
QuestionInput delays Pin
Joe Wright1-Sep-08 8:12
memberJoe Wright1-Sep-08 8:12 
AnswerRe: Input delays Pin
Jeff Morton1-Sep-08 13:45
memberJeff Morton1-Sep-08 13:45 
Joe Wright wrote:
We are using this code for a application that requires immediate response times, With some slower computers that get momentarily stress, delays of a second or longer can appear in the microphone input signal, regaurdless of the number of buffers used. Is there any way to avoid this or tell what the delay is?

You are using this code in an application that you intend to sell commercially? You realize that that is a violation of the OSS license which this was published under correct?

As far as the robustness of the code, I never intended for this to be used in any application which requires a high degree of performance and have made no claims to that effect. Keep in mind that if the hardware is not capable than no amount of creative coding is going to make up for that.

If you are looking for something a little more refined than I suggest checking out my subsequent contribution "Sound Activated Recorder with Spectrogram in C#". I've added a number of performance improvements, cleaned up the code, and eliminated some unintended bugs which I had originally overlooked. Overall, it's a far better example.
GeneralIt works! Pin
Member 470880128-Aug-08 22:08
memberMember 470880128-Aug-08 22:08 
GeneralShutdown addition Pin
firmwaredsp31-Oct-07 23:26
memberfirmwaredsp31-Oct-07 23:26 
GeneralRe: Shutdown addition Pin
Ri Qen-Sin20-Nov-07 18:39
memberRi Qen-Sin20-Nov-07 18:39 
GeneralRe: Shutdown addition Pin
Jeff Morton27-Nov-07 3:57
memberJeff Morton27-Nov-07 3:57 
GeneralRe: Shutdown addition Pin
firmwaredsp28-Nov-07 0:21
memberfirmwaredsp28-Nov-07 0:21 
QuestionHow it works?? Pin
Ibrahim Dwaikat28-Oct-07 10:22
memberIbrahim Dwaikat28-Oct-07 10:22 
AnswerRe: How it works?? Pin
j_morton28-Oct-07 10:29
memberj_morton28-Oct-07 10:29 
GeneralRe: How it works?? Pin
Ibrahim Dwaikat28-Oct-07 10:34
memberIbrahim Dwaikat28-Oct-07 10:34 
GeneralRe: How it works?? Pin
firmwaredsp31-Oct-07 23:47
memberfirmwaredsp31-Oct-07 23:47 
GeneralRe: How it works?? Pin
Jeff Morton28-Nov-07 4:44
memberJeff Morton28-Nov-07 4:44 
GeneralVery nice Pin
blackjack215023-Oct-07 2:01
memberblackjack215023-Oct-07 2:01 
QuestionHow To Get Frequency, or Period of the Wave? Pin
Paul Chin PC29-Sep-07 5:45
memberPaul Chin PC29-Sep-07 5:45 
QuestionDoesn't work :( Pin
Vladimir Grankovsky27-Aug-07 2:39
memberVladimir Grankovsky27-Aug-07 2:39 
AnswerRe: Doesn't work :( Pin
JeffMorton28-Aug-07 8:08
memberJeffMorton28-Aug-07 8:08 
GeneralRe: Doesn't work :( [modified] Pin
meliton gavia8-Jan-09 18:08
membermeliton gavia8-Jan-09 18:08 
AnswerRe: Doesn't work :( Pin
ajgreen198723-Jul-09 6:36
memberajgreen198723-Jul-09 6:36 
AnswerRe: Doesn't work :( Pin
Terricide15-Oct-09 23:11
memberTerricide15-Oct-09 23:11 

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