I wonder if there is any software that can make use of the internal microphone of an iPAQ and produce an anti-phase signal to cancel out noises?

I'm thinking of travelling but I couldn't afford noise-isolating headphones so I think this could be an alternative. I want a more comfortable 14 hours flight

I have an 4150 and I think the CPU should be more than enough to handle both microphone and mp3 playing at the same time?

Many thanks.