/>
X
Innovation

iPhone 4's noise cancellation chip unmasked

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.
Written by Jason D. O'Grady, Contributor on

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. 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 3mm chip (labeled simply "10C0" above) that it found during iPhone 4 teardown last summer, but almost a year later, part of the mystery has been solved. The chip's manufacturer has been identified as Audience -- the same company that built the A1026 voice processor found in the Nexus One (below).

Chipworks solved the mystery by "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 at Chipworks.

Tip: iFixIt

Editorial standards

Related

The 16 best Cyber Monday deals under $30 still available
Amazon Fire TV Stick 4K

The 16 best Cyber Monday deals under $30 still available

Epson is going to stop selling laser printers. Here's why
piles-of-paper.jpg

Epson is going to stop selling laser printers. Here's why

This cruel email-hacking gang aims to tug on your heartstrings and steal your cash
a-woman-holding-her-bank-card-and-doing-online-shopping-from-home

This cruel email-hacking gang aims to tug on your heartstrings and steal your cash