ccs.chaos
Class NoiseGrabber

java.lang.Object
  ccs.chaos.NoiseGrabber

public class NoiseGrabber
extends java.lang.Object

The NoiseGrabber uses the Java Sound API to record the low-order bits of brief sound clips from the system. The idea is that you disconnect your mic, turn the gain up to 11 and record the preamp noise. This contains a useful amount of entropy.

Constructor Summary

NoiseGrabber()
Constructs the NoiseGrabber.

Method Summary

void	init() Initialises the NoiseGrabber to read noise.
byte[]	sample(int secs) Sample the line for a given period and return the non-zero low-order bytes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NoiseGrabber

public NoiseGrabber()

Constructs the NoiseGrabber.

Method Detail

init

public void init()
          throws java.io.IOException

Initialises the NoiseGrabber to read noise. Must be called before sample. Can be safely called multiple times.

Throws:

java.io.IOException

sample

public byte[] sample(int secs)
              throws java.io.IOException

Sample the line for a given period and return the non-zero low-order bytes. Samples which are zero (these are very numerous) are discarded.

Throws:

java.io.IOException