1-There are four classification for signals:
-one dimensional signals:that includes speech
,music,and computer data
-Two dimensional signals:include images
-Three dimensional signals:include video data
-Four dimensional signals:include volume data over time.
2-Data communication is the transmission of computer
and other digital data via telephone,microwave links or satellite.
3-An unexpected development is the role that computers
play in communication.E-mail now allows individuals to exchange messages with
each other through networks in homes,offices,nationwide and worldwide.But,e-mail
did not replace the telephone or fax it only added a new way for people to
communicate faster.
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