Active noise cancellation
I got this idea from reading about noise cancelling headphones a few months ago. You can read more about them here since Wikipedia can explain it better than I can http://en.wikipedia.org/wiki/Noise-cancelling_headphone
Basically I want to apply the same principle to cancel out fan noise in my computer case. I think it would be possible to do this with an inverting unity gain amplifier, microphone and a PC case speaker. It could be powered by the computer power supply and mounted inside the case.
Has anyone tried this?
I think it would be a great way to keep a computer quiet without sacrificing cooling ability. I know there are a lot of effective low noise heat sinks and fans but they cost $40 or more and won't work when a new socket comes out.
mcrophone (inside) and speaker (outside)
So there would have to be a separate speaker on the outside of the case -would it not be possible to use the stereo speakers connected to 'line out' if there was an adjustment slider in software?
I like the idea of masking 'in addition' selectable to 'waterfall, rain, rushing stream etc.' maybe. I'm toying with the idea of carrying further to make a 'piece of furniture' to slide a case into - could install acoustic foam on the inside. Need to address airflow, but ought to be able to get down close to zero effect noise - right?
If I go this route, would the noise canceling software (/hardware) be unnecessary?
Thanks :)