QUOTE (hyeewang @ Feb 5 2009, 05:58)

2. Why movie director imagine and make robot speak with such voice?
I remember hearing that the traditional pirate voice we hear today ("Yarr! Me Hearties!" etc.) was first introduced by an actor playing Long John Silver in the first Treasure Island. Since then, everyone uses his voice when being a pirate.* Perhaps there is a similar case for robots in film, or you look at the answer to question 1. Of course, not all robots have the classic robot voice: HAL, as an early example.
QUOTE (hyeewang @ Feb 5 2009, 05:58)

3. How does a Real robot speak? Why?
Science. To answer questions posed by its human master.
* Yes UK members, I am a fan of QI.