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Posted 13 Jun 2000

A simple prototype for demonstration of Voice Communication via Network/Internet

, 14 Jun 2000
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Voice communication
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    This is the simplest prototype to demonstrate how to realize a basic Voice Communication via Internet/Network on PC platform. The technique in this demo can be applied to develop the PC internet voice communication software, such as Internet Phone.

    To save development time, I borrowed the idea of Client/Server design in Microsoft MSDN sample "GlabolChat". 

    This sample has been tested in a intranet consisted of NT4.0 Server/Workstation and a LAN consisted of Win2000 Professional. The CPUs in the testing PC are at least  Intel P2 266 or faster, and SoundCard, Mic, Speaker are must.

    In the tests, it can work smoothly in bi-directions voice talk with the a acceptable sound quality.

    The basic system design

    This sample contain two modules, Talkserver and Talkclient.

    The basic system diagram is like:

    System diagram

    Server Module

    Server module has two type sockets, server sockets and client sockets. One server socket supports a certain network protocol and listens the incoming connection with such protocol. When a client connection request comes, the server socket create a client socket to build the link with the client. The client socket works to receive the messages from its client, transit the message to peer client socket, then the peer client socket send the messages to the target client. The client socket also get the messages from the peer   socket and send these message to its client.  

    Client Module

    The user can use the client modules to communicate in voice with each other. The socket in the client is implemented as sending/receiving messages to/from the server.

    The method to capture and transit sound data in client module is  building and runing a wave input device, when this wave input device records enough to size of the data buffer in its wave header structure, it notifies client instance. When the client receives the wave input device message, client retrieves the sound data in the wave input device buffer, then encodes the sound data into the voice communication message and sends to the peer (or target) client.

    To play a voice message is similar. The client has a wave out device. After the client receive voice message from other client, it decodes the sound data from the message, put the sound data to the wave output device and drives it to play the sound. 

    Change sound quality

    By changing the wave device buffer and wave format type defined in vtDef.h, you can change the sound quality in some kind of levels. 


    Date Posted: Jun 14, 2000


    This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

    A list of licenses authors might use can be found here


    About the Author

    Zhaohui Xing
    United States United States
    No Biography provided

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    Comments and Discussions

    General[Message Deleted] Pin
    it.ragester2-Apr-09 21:50
    memberit.ragester2-Apr-09 21:50 
    Generalwnat to setup an vc++ project Pin
    y_naga_malleswararao10-Apr-06 1:51
    membery_naga_malleswararao10-Apr-06 1:51 
    GeneralGood Job ! Pin
    carlmalden14-Mar-06 15:22
    membercarlmalden14-Mar-06 15:22 
    GeneralClient crashes when voice talk is clicked Pin
    doctorrie1-Oct-05 20:06
    memberdoctorrie1-Oct-05 20:06 
    Generalencryption Pin
    valroft12-May-05 10:11
    membervalroft12-May-05 10:11 
    GeneralRe: encryption Pin
    suendisra15-Apr-12 17:56
    membersuendisra15-Apr-12 17:56 
    QuestionHow to configure the protocol and talk server Pin
    wenfoo16-May-04 17:53
    memberwenfoo16-May-04 17:53 
    Generalbetter code then this Pin
    dharani26-Sep-03 1:58
    memberdharani26-Sep-03 1:58 
    QuestionHow support a microphone in C# Pin
    CaoNan22-Aug-03 21:00
    sussCaoNan22-Aug-03 21:00 
    AnswerRe: How support a microphone in C# Pin
    Anonymous5-Oct-05 18:23
    sussAnonymous5-Oct-05 18:23 
    Generalerror in preparing buffer when reseting Pin
    Maria Calvo1-Jul-03 6:20
    sussMaria Calvo1-Jul-03 6:20 
    Generalrepeated strange noises with talk option activated Pin
    Marcos Martinez1-Jul-03 0:39
    sussMarcos Martinez1-Jul-03 0:39 
    Generalfirst Pin
    mannu200320-Apr-03 7:03
    membermannu200320-Apr-03 7:03 
    GeneralRe: Making it for WinCE Pin
    dharani26-Sep-03 2:00
    memberdharani26-Sep-03 2:00 
    Questionhow can i modify it to work over Internet Pin
    keen22-Dec-02 20:01
    memberkeen22-Dec-02 20:01 
    AnswerRe: how can i modify it to work over Internet Pin
    Joey24-Dec-02 6:18
    memberJoey24-Dec-02 6:18 
    GeneralRe: how can i modify it to work over Internet Pin
    mesut_pak12-Mar-05 6:32
    membermesut_pak12-Mar-05 6:32 
    GeneralEcho problem Pin
    Saad Maqsood5-Nov-02 21:46
    sussSaad Maqsood5-Nov-02 21:46 
    GeneralRe: Echo problem Pin
    Anonymous7-Jan-03 17:26
    sussAnonymous7-Jan-03 17:26 
    Generalcool! Pin
    Anonymous12-Aug-02 11:34
    sussAnonymous12-Aug-02 11:34 
    GeneralThis is not working in LAN Pin
    Anonymous4-Aug-02 22:14
    sussAnonymous4-Aug-02 22:14 
    GeneralRe: This is not working in LAN Pin
    AlejandroDG13-Mar-05 3:34
    memberAlejandroDG13-Mar-05 3:34 
    GeneralThis is not working in LAN Pin
    Anonymous4-Aug-02 22:13
    sussAnonymous4-Aug-02 22:13 
    GeneralVery nice but a lot of echos Pin
    Anonymous24-Apr-02 21:12
    memberAnonymous24-Apr-02 21:12 
    GeneralVoice communication in windows ce platform Pin
    mazlin25-Feb-02 18:46
    membermazlin25-Feb-02 18:46 

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