iFixIt has uncovered one of the secrets of the iPhone 4’s excellent noise cancellation — which might have flown under the radar because it was so good.
Apple built the iPhone 4 with two microphones for noise cancellation.Â Its second mic, located near the headphone jack, is for FaceTime calls and to suppress background noise.
iFixIt couldn’t positively ID a 3 x 3mmÂ chip (labeled simply “10C0″ above) that it found duringÂ iPhone 4 teardown last summer, but almost a year later, part of the mystery has been solved. The chip’s manufacturerÂ has been identified as Audience –Â the same company that built theÂ A1026 voice processor found in theÂ Nexus One (below).
Chipworks solved the mystery byÂ ”decapping” the chip which revealed an “AUDIENCE” die marking inside the chip, shown magnified below.
You can read more on the embedded digital signal processor (and its accompanying analog front ends) on the Audience earSmart A1026 product page and over atÂ Chipworks.
Read the original post on The Apple Core Blog RSS | ZDNet