So, I've been working on a project to identify potential high frequency 22khz+ on behalf of a new dog in the house. While chatting about it to a relative we began discussing his situation. This field is new to me but I have experience in .Net programming. Here's the situation:
He works in a booth in a paper mill. The machine creates a repetitive sound ranging from about 600 hz to 1800 hz in a saw tooth pattern over 5 seconds. I know this as he recorded it and I can look at it in Adobe Audition. There are some "harmonics" well above this as well but those look minor in comparison. The problem is that to cut the mind numbing psychosis inducing (that explains a lot about him BTW) noise the booth has to be sound proofed and he has to wear muffs.
If we could create some type of noise cancelling FFT algorithm that can run on the PC in the booth or some other mini PC or device that could sync with and cancel out this pattern it would be really cool. I was thinking of one of the small speaker type boxes or larger desk top speakers if that kind of power is needed as output. From the reading I've been doing it looks possible and I don't think I would need the processing power to overcome ALL noise just the known frequencies.
I'm looking for any thoughts if this is possible on a DIY basis for a .Net programmer or if a device / software package already exists? I know it is easy as pie for recorded sounds but how to transmit the cancelling sound to make it less perceptible by the guy in the booth?