DATA COMMUNICATION PRACTICAL-PCM

TE ELECTRONICS  DATA COMMUNICATION PRACTICAL



                                                                                     Introduction to Practicals

 Name of Experiment :-Experimental study of Pulse Code Modulation 

Modulation is the process of varying one or more parameters of a carrier signal in accordance with the instantaneous values of the message signal.

The message signal is the signal which is being transmitted for communication and the carrier signal is a high frequency signal which has no data, but is used for long distance transmission.

There are many modulation techniques, which are classified according to the type of modulation employed. Of them all, the digital modulation technique used is Pulse Code Modulation PCM.

A signal is pulse code modulated to convert its analog information into a binary sequence, i.e., 1s and 0s. The output of a PCM will resemble a binary sequence. The following figure shows an example of PCM output with respect to instantaneous values of a given sine wave



Pulse Code Modulation

Instead of a pulse train, PCM produces a series of numbers or digits, and hence this process is called as digital. Each one of these digits, though in binary code, represent the approximate amplitude of the signal sample at that instant.

In Pulse Code Modulation, the message signal is represented by a sequence of coded pulses. This message signal is achieved by representing the signal in discrete form in both time and amplitude.




 
           PRE TEST 
                                                                      THEORY                         PRACTICAL

 
                                                                                                                                                POST TEST




























Comments

  1. AnonymousJuly 22, 2020 at 7:58 AM

    Very informative

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  2. AnonymousJuly 22, 2020 at 7:58 AM

    Very informative

    ReplyDelete
  3. AnonymousJuly 22, 2020 at 7:58 AM

    This comment has been removed by a blog administrator.

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