ios - Active Noise Cancellation through default iPhone headphone -


we want create app implement active noise cancellation using default iphone headphone. is, receive external audio using iphone headphone mic , make phase shift of 180 degree. finally, play inverted sound through default headphone speaker cancel external sound(active noise cancellation).

ref: http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone.htm

can feasible iphone app?

with sound traveling @ 343 m/s, assuming distance between microphone , speaker half meter, you'd have 1.5 milliseconds of processing time. not impossible, not simple feat either, if take account time takes various components start playback , recording app. think why of active noise canceling headphones require specialized hardware.

that said, think should go it. i'm interested in well; guess have fourier transform on input , phase shift 180° said, transform time domain, , play user?


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