“Apple’s A5 processor includes noise-reduction circuitry licensed from a start-up called Audience, and a chip analyst believes that fact resolves an iPhone 4S mystery and explains why the iPhone 4 lacks the Siri voice-control system,” Stephen Shankland reports for CNET.

“Audience revealed details of its Apple partnership in January, when it filed paperwork for an initial public offering (IPO) of stock,” Shankland reports. “Teardown work from iFixit and Chipworks revealed a dedicated Audience chip in the iPhone 4, but the iPhone 4S integrates Audience’s ‘EarSmart’ technology directly into the A5 processor, the company’s S-1 filing said.”

Shankland reports, “Audience also said in its filing that its iPhone 4-era technology was good only when the phone was held near the speaker’s mouth. Audience’s noise-reduction technology built into the iPhone 4S is better, though.”

Much more in the full article here.

[Thanks to MacDailyNews Reader "Fred Mertz" for the heads up.]