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I'm doing a project that involves making a pair of headphones capable of active noise reduction. Specifically, I'm attempting to do impulse based noise reduction rather than blocking a constant repeating sound. I'll be programming in C++, and planned to use a Raspberry Pi, however it seems I would need a separate board for audio processing. Does anyone have any recommendations for what to use here, or possibly a better method than the Pi + sound board? I don't know a whole lot about audio processing or the hardware involved, so any knowledge shared is appreciated.

I am aware of the delays that using a Pi would likely introduce, however getting around those is part of the project's focus and I have some solutions in mind, but suggestions are also appreciated in this area.

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There is an incomplete short list of sound cards available here on eLinux

You will most likely want to use a GPIO board rather then a USB sound card because of the USB latency issues.

I think you can get latencies as low as 1ms or less in some cases.

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