A brainwave generator is a tonegenerator that makes a sinus-tone at the same hz as the brain trough different states.
It is supposed to help the brain to enter a stage by listening to this,
it helps me.
State Frequency range State of mind
Delta 0.5Hz - 4Hz Deep sleep
Theta 4Hz - 8Hz Drowsiness (also first stage of sleep)
Alpha 8Hz - 14Hz Relaxed but alert
Beta 14Hz - 30Hz Highly alert and focused
Since my programmingskills are poor I have generated tones at different frequensies and made wave filesof them for use at my sansa-clip and home stereo.
I used the tone generator in Nuendo to make the files.
You will be needing very good heasphones to hear the lowest hz, my beyerdynamic dt990 starts at 5 hz,
my giant sub in my livingroom covers the rest.
A tone generator that covers all all frequensies would have been very cool also for other purposes.
Like tuning instruments by ear(ref tone) and voice-training.
There is a lot of them around, like this :http://www.ringbell.co.uk/software/audio.htm
This one only starts at 100hz though, and I have not checked how accurate it is.
Anyone up for making a full range tone generator?