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I seem to recall talk of using active noise cancelling for automotive exhausts back in the '80s. Never heard of it reaching market. I have Bose noise cancelling headphones I use nearly exclusively on air flights. Work well. A motorcycle helmet will likely be a different matter. Lots of noise reaching your inner ear from air pressures on helmet, under helmet, through visor seals etc. Placing a microphone at one location to sample ambient noise, then invert the signal waveform to be sent out speakers, is going to be ineffective IMHO. Proper headphones work ok b/c they are controlling most sound reaching the ear, then adding the inverted waveform to cancel what the mic picks up.

[QUOTE="Tornado, post: 580921, member: 9274"] I seem to recall talk of using active noise cancelling for automotive exhausts back in the '80s. Never heard of it reaching market. I have Bose noise cancelling headphones I use nearly exclusively on air flights. Work well. A motorcycle helmet will likely be a different matter. Lots of noise reaching your inner ear from air pressures on helmet, under helmet, through visor seals etc. Placing a microphone at one location to sample ambient noise, then invert the signal waveform to be sent out speakers, is going to be ineffective IMHO. Proper headphones work ok b/c they are controlling most sound reaching the ear, then adding the inverted waveform to cancel what the mic picks up. [/QUOTE]