"moon" wrote in message
m
Hi all,

I have a Q that i like from you to help me about:

My friend asked me for a portable device that cancel the noise around
him while it amplifies his voice only.

That's called a noise-cancelling microphone. Search google using the text
noise cancelling microphone and numerous alternatives will be presented.

Actually, he wants to utilize
his time reading in the bus, instead of wasting it.

That only requires that he be sighted and literate.

He refused the
idea of mp3 player because he could not focus in reading while any
noise is a round him even if it is a music.

That's called ear plugs.

http://www.earplugsonline.com/index.html

http://www.etymotic.com/ephp/erme.asp

So anyone is aware of a
product that can satisfy his needs.

First he has to settle on what he wants to do.