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Is the iPad Siri ready? Meaning it would be full functioning with a software update or is a hardware upgrade needed?
 
Note someone told me that siri is not on the iPad because the iPad needs 24/7 data 4g connection like the iPhone 4s.

Siri needs a data connection to Apple's servers, yes.

The way it works is that the phone first records your speech.

The phone picks out the major speech components (*) and sends them to the Apple server. I believe it also sends helpful information such as the Name-Tag pairs you've set ("brother" = "Tom", etc).

The Apple server uses your previous voice requests and those of millions of other users, to compare and determine the most likely thing you said. It then sends back appropriate words and commands to the phone.

Without the data connection, the phone cannot even decode what you said.

(*) The official excuse for requiring the 4S for Siri, is supposedly because the 4S has a dedicated subprocessor that can be used for this voice component analysis while other things are going on. Or something like that. I haven't really paid that much attention beyond looking up the algorithms involved.
 
Aggregating Siri on a centralized server cluster is both good and bad. The good is that it can normally get a good syntax formed by comparing speech patterns and you'll have a pretty good dictation of whatever you recorded. That bad part is, the voice recognition technology with syntax is not that much better than normal voice dictation so localizing voice dictation seems to be a better choice right now. Dragon Dictation will do what you want in terms of voice dictation.
 
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