An audio processing chip from Audience has been revealed as the key component behind the dual-microphone noise cancellation technology in the iPhone 4. iFixit reports that the unmarked chip was seen in both the GSM and CDMA iPhone 4, but was not identified as an Audience chip until microprocessor analysis firm Chipworks “decapped” the chip, revealing it as an Audience low power audio signal processor, with an Audience die marking inside. According to Audience, its voice processors “imitate the complex processes of human hearing to enhance voice quality and suppress noise. The result is unsurpassed call clarity for mobile devices, and improved performance for speech recognition services.”

Charles Starrett

Charles Starrett was a senior editor at iLounge. He's been covering the iPod, iPhone, and iPad since their inception. He has written numerous articles and reviews, and his work has been featured in multiple publications.