iPhone 4S has special noise reduction hardware for SIRI, makes official iPhone 4 Siri port unlikely

It turns out that Apple's Siri voice assistant is enabled by special noise reduction hardware called earSmart, wired right into the Apple A5 processor. The technology is made by Audience, which has an earSmart-less chip in the iPhone 4. The difference is, the iPhone 4 chip was designed to reduce noise when speaking directly into the microphone (like when you're on a phone call), while the chip in the iPhone 4S is designed for a wider field of sound, so you could talk to your phone at arm's-length (as one tends to with Siri) and still benefit from noise cancellation. The bundling of earSmart with the processor explains why the A5 chip was so much bigger than expected, even after taking into account the second core. It also means that, if you're still desperately clinging to the hope that Apple will someday update the iPhone 4 with Siri functionality, now's the time to let go.

Siri was obviously a defining feature of the iPhone 4S, which was sorely needed considering all of the cosmetic similarities to its predecessor. Apple was even willing to throw in an extra infrared sensor to optimize the Siri experience. Now the assistant is poised to leap onto Apple TV and the iPad, assuming the earSmart is included on those devices too. Now, if things could get a little more optimized on the software side so that Siri doesn't double your data usage, then Siri would have all of its bases covered. It's worth noting that earSmart also licenses out to a bunch of other manufacturers, so you can expect voice control on other platforms over time. Just, uh, don't expect the Android alternatives to be blowing Siri out of the water just yet.

While this doesn't leave a lot of hope for an official port of Siri to the iPhone 4, you can always try some warrantee-exploding hackery... Head on over here to see some of the devices that currently have earSmart included.

Source: CNET

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Simon Sage

Editor-at-very-large at Mobile Nations, gamer, giant.

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Reader comments

iPhone 4S has special noise reduction hardware for SIRI, makes official iPhone 4 Siri port unlikely


So is the iPad 2 still up in the air for ever getting Siri? Or are the iPad 2 A5 and the iPhone 4S A5 to different chips?

I guess Apple thinks everyone is dumb, Siri was a beta app on Iphone4 before the 4S came out. Right after the 4S came out.
nice try apple, you just want more money, come on be honest.

+1 I had the app forever it's not as food as you guys here make it out to be but this iPhone but ya it's all about the money and greed is gonna kills us

Lol excuse after excuse...its obvious to apart from the blind fan boys that apple did not put siri on the 4 because it would most likely have impacted the sale of the 4s..nearly everyone I know got the 4s because "magical" sir I and I have tried it on a 4 and it works the same.

Uh, I thought Spire kinda proved that the only thing stopping Siri from working on other iOS devices was the authentication tokens...? Please enlighten me.

I wonder if this explains why apps such as sound level readers give highly inaccurate results on the iPhone 4S?

I have a iPhone 4 with spire and my friend has a 4s and in all honesty day work just the same apple just wNts there money and I'm not mad at them

Honestly Siri gets old really fast. It's probably the least used feature of my 4S now...
They need to add voice navigated gps to make it at least somewhat useful.

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