How does Siri work?

These years, Apple has totally changed our lifestyle. The screen-touching technology brought by Apple Company leads the world into a new "century". Nevertheless, Apple still brings out more and more new technology, and Siri is one of those achievements. Using voice-interact technology, Siri is just like an intelligent robot. So how could Siri work like that?

The User Interface(UI) tech is the core element in Siri. The signal from your connected phone was relayed wirelessly through a nearby cell tower and through a series of land lines back to your Internet Service Provider where it then communicated with a server in the cloud, loaded with a series of models honed to comprehend language. Simultaneously, your speech was evaluated locally, on your device. A recognizer installed on your phone communicates with that server in the cloud to gauge whether the command can be best handled locally. 

The server compares your speech against a statistical model to estimate, based on the sounds you spoke and the order in which you spoke them, what letters might constitute it.Based on these opinions, your speech -- now understood as a series of consonants -- is then run through a language model, which estimates the words that your speech is comprised of. In this case, Siri will run out the response of the question you asked.

Besides the UI, there are also other techs that being used in Siri such as cloud calculating and 

intelligent interact. By gathering those skills, Siri has already becomes an widely-used tool in our lives nowadays. 

Reference:

1. Derived from: http://www.zdnet.com/article/how-apples-siri-really-work

Image Reference:

1. http://baike.baidu.com/pic/siri/32248/0/9345d688d43f87943c724d8dda1b0ef41ad53a87?fr=lemma&ct=single#aid=0&pic=9345d688d43f87943c724d8dda1b0ef41ad53a87