Get all output-soundsignals from the soundcard

Question

I want to display all output-audiosignals from the soundcard. How can I realize that?
So far I tried that with the Java Sound API and the following code:
audioFormat = getAudioFormat();
dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
targetLine = (TargetDataLine) AudioSystem.getLine(dataLineInfo);
targetLine.open(audioFormat);
targetLine.start();          
targetLine.read(dataBuffer, 0, numOfBytes);
private static AudioFormat getAudioFormat(){
float sampleRate = 8000.0F;
int sampleSizeInBits = 16;
int channels = 1;
boolean signed = true;
boolean bigEndian = false;
return new AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
With that I got different results on different computers. Sometimes it displays data
although there isn't any output on my soundcard and on some other computers it displays nothing.
I've already read a lot of tutorials, but they didn't help me.
Thank you.

Answer 1

I want to display all output-audiosignals from the soundcard. How can I realize that?
So far I tried that with the Java Sound API and the following code:
audioFormat = getAudioFormat();
dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
targetLine = (TargetDataLine) AudioSystem.getLine(dataLineInfo);
targetLine.open(audioFormat);
targetLine.start();          
targetLine.read(dataBuffer, 0, numOfBytes);
private static AudioFormat getAudioFormat(){
float sampleRate = 8000.0F;
int sampleSizeInBits = 16;
int channels = 1;
boolean signed = true;
boolean bigEndian = false;
return new AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
With that I got different results on different computers. Sometimes it displays data
although there isn't any output on my soundcard and on some other computers it displays nothing.
I've already read a lot of tutorials, but they didn't help me.
Thank you.