We have heard a million different reasons as to why Siri is iPhone 4S only. This seems to be the most technical and revealing detail so far. Audience’s earSmart noise canceling technology integrated with the 4S’ A5 processor is one of the reasons:

“Audience revealed details of its Apple partnership in January, when it filed paperwork for an initial public offering (IPO) of stock. 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. [...]”

“Even after accounting for the dual Cortex-A9 CPUs and the large GPU that provides the A5 with industry-leading 3D graphics performance, the remaining die area seems too large for the usual mundane housekeeping logic,” Gwennap said in a report yesterday. “To reduce system cost and eliminate the extra package required for the Audience chip, Apple cut a deal to integrate the noise-reduction technology directly into its A5 processor, which appears in the iPhone 4S.”

If your next question is something along the lines of “doesn’t iPad 2 have an A5 processor too?” The answer is a definite yes. Tests have proven that iPad’s processor is actually a bit faster than that of iPhone. So why doesn’t iPad 2 have Siri?

Apple is possibly reserving it for future upgrades of their hardware such as the iPad 3. The question now then turns into WHEN Apple wants to activate iPad 2 Siri and not IF they can. Is Apple being greedy, or do you understand these kinds of “marketing strategies”?

[Source: Macrumors]