ECHO...ECho.....echo.......in transmitted audio

Hello!
I am facing this problem:_
1- If I capture audio (using either dsound or javasound, doesn't matter), and then transmit it in any format . Then the sound recieved at the receiver end has echo which seems very awkward.
2- Second problem is....If I try to monitor the audio during transmission or play the captured sound on the same system then within seconds sound volume becomes very high and there is too much disturbance. So, I have to stop monitoring the audio straight away....... sound is something like this:
keeen....keeeeeeen........cheeeeeeeeeen........cheeeeeeeeeeen.....eeeeeeeeeeeeen....eeeeeeeeennnnnnnnnnnnnn ;-)
This sound is really unbearable......... it seems like the ear drums would burst if you don't turn it off...........
specs:_
1- OS: Vista Home Premium
2- JMF: JMF2.1.1e
3- sound captured with integrated microphone in Laptop.
questions:_
1- Has anybody faced the same problem???
2- Does anybody know how to remove this echo????
I would be very grateful if any one comes up with any reply.
*5 Dukes* if anyone suggests a solution to remove the echo..........
Thanks!

2) That's called a feedback loop. The microphone is picking up the speakers and then playing what it heard from the speakers through the speakers. As the speakers get louder, the microphone picks up more of the speakers, and plays the sound back louder...until the microphone reaches saturation, and then you just have an aweful loud siren-like thing. Bad deal.
1) In reference to the echo, are the two computers in the same room? Because if so, the microphone is picking up the speaker on the second computer, and that's what's causing the echo. It doesn't do the feedback loop because, of the distance and time delay, the sound gets progressively quieter every time it is played (as opposed to louder, in the above case)Hello captfoss! Welcome back!
Happy to see you back..............
I can't believe my problem was so simple............... Yes, both the computers are in the same room. I have understood the problem.
But if you give me assurance that there would be no problem of echo if the computers are far away then all 5 dukes would be yours.
P.S.: my second problem: [http://forums.sun.com/thread.jspa?threadID=5345682&tstart=10]
Thanks!

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2) That's called a feedback loop. The microphone is picking up the speakers and then playing what it heard from the speakers through the speakers. As the speakers get louder, the microphone picks up more of the speakers, and plays the sound back louder...until the microphone reaches saturation, and then you just have an aweful loud siren-like thing. Bad deal.
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But if you give me assurance that there would be no problem of echo if the computers are far away then all 5 dukes would be yours.
P.S.: my second problem: [http://forums.sun.com/thread.jspa?threadID=5345682&tstart=10]
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Hello.
I have just downloaded JMF 2.1.1 and have cribbed one of the examples to produce an application that will capture audio input, process it and pass it straight to the speakers. However, I am getting echo, i.e. the input signal appears twice at the speakers, shifted by about half a second.
Now, before you tell me that it is due to feedback from the speakers to the microphone, I must tell you that my audio signal is from a radio plugged into the mike socket of my PC, so there is no chance of any external feedback.
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Now, the really interesting thing is that if I uncomment the lines that mute the processor, I get only a single signal out of the speakers. It appears as if there is some connection between the mike input and speaker output.
Just to make sure, I tried this with JMStudio and got the same result. When I captured input, I got two signals output until I pressed the mute button, when I got one signal.
I also get the same problem if I use a Player, rather than a Processor.
I am running on Win95, JDK1.3.
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Hello.
I have just downloaded JMF 2.1.1 and have cribbed one
of the examples to produce an application that will
capture audio input, process it and pass it straight
to the speakers. However, I am getting echo, i.e. the
input signal appears twice at the speakers, shifted by
about half a second.
Now, before you tell me that it is due to feedback
from the speakers to the microphone, I must tell you
that my audio signal is from a radio plugged into the
mike socket of my PC, so there is no chance of any
external feedback.
Below is the code:
import javax.media.*;
import javax.media.protocol.*;
import javax.media.control.*;
import javax.media.format.*;
public class ExampleClass2 implements
ControllerListener {
     private Object waitSync = new Object();
private boolean stateTransitionOK =
ansitionOK = true;
     private Processor proc;
     public ExampleClass2 () {
MediaLocator locator = getLocatorByName ("JavaSound
d audio capture");
          try {
               proc = Manager.createProcessor(locator);
               proc.addControllerListener(this);
               proc.configure();
               waitForState (Processor.Configured);
               proc.setContentDescriptor(null);
               proc.start();
//               waitForState(Processor.Started);
//          proc.getGainControl().setMute(true);
          } catch (Exception ex) {
               ex.printStackTrace();
               System.exit(1);
* Block until the processor has transitioned to
d to the given state.
* Return false if the transition failed.
boolean waitForState(int state) {
     synchronized (waitSync) {
     try {
while (proc.getState() != state &&
& stateTransitionOK)
          waitSync.wait();
     } catch (Exception e) {}
     return stateTransitionOK;
* Controller Listener.
public void controllerUpdate(ControllerEvent evt)
vt) {
     if (evt instanceof ConfigureCompleteEvent ||
     evt instanceof RealizeCompleteEvent ||
     evt instanceof PrefetchCompleteEvent) {
     synchronized (waitSync) {
          stateTransitionOK = true;
          waitSync.notifyAll();
} else if (evt instanceof ResourceUnavailableEvent)
     synchronized (waitSync) {
          stateTransitionOK = false;
          waitSync.notifyAll();
     } else if (evt instanceof EndOfMediaEvent) {
     proc.close();
     System.exit(0);
     public static void main (String [] args) {
          ExampleClass2 two = new ExampleClass2();
Now, the really interesting thing is that if I
uncomment the lines that mute the processor, I get
only a single signal out of the speakers. It appears
as if there is some connection between the mike input
and speaker output.
Just to make sure, I tried this with JMStudio and got
the same result. When I captured input, I got two
signals output until I pressed the mute button, when I
got one signal.
I also get the same problem if I use a Player, rather
than a Processor.
I am running on Win95, JDK1.3.
Any thoughts?

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Message was edited by: Adrian Smith4
Message was edited by: Adrian Smith4

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import java.awt.BorderLayout;
import java.net.InetAddress;
import javax.media.*;
import javax.media.control.MonitorControl;
import javax.media.format.VideoFormat;
import javax.media.protocol.ContentDescriptor;
import javax.media.rtp.*;
import javax.swing.*;
* @author talha
public class RTPexp extends JFrame {
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flag = true;
if (p.getControlPanelComponent() != null) {
jp3.add(p.getControlPanelComponent(), BorderLayout.SOUTH);
validate();
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ex.printStackTrace();
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p.stop();
p.close();
jp3.removeAll();
jp3.validate();
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java.awt.EventQueue.invokeLater(new
Runnable() {
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Thanks!

Transmitting audio stream by RTP

Hello:
I am trying to transmit audio stream with this code, but i dont get it work well.
The output is:
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The code receptor is working well, because I tried it with JMStudio.
Why it doesnt transmit ?
I need your greatly help.
Thanks.

What is different from your previous question ?

ECHO...ECho.....echo.......in transmitted audio

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