introduction to the signals

today we will deal with the signals .....in our day to day life we all our dealing with the signals....
now you can say that you all are surrounded by the signals....
in the day to day to life we come across various types of signals and systems......

now mainly two form of the signals are there namely:-
1.analog signals:-
these are the signals which can have infinite number of different magnitudes or values....
they vary continuously with time ....
sine wave,triangular wave are the best example of analog signals...

2.digital signals:-
a signal is called as a digital signal if it has only a finite number of predetermined distinct magnitudes..
depending on the number of distinct magnitudes,the digital signals are classified as:

   number of distinct magnitude ----------------- type of digital signal
               2                                                                 binary
               8                                                                  octal
              16                                                               hexadecimal