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CBSE Class 12-science Answered

a) Distinguish between 'Analog and Digital signals'. b) Mention the function of any two of the following used in communication system: (i) Transducer (ii) Repeater (iii) transmitter (iv) Bandpass Filter
Asked by Topperlearning User | 10 Jul, 2014, 05:54: PM
answered-by-expert Expert Answer
Analog signal
Digital signal

1. Analog signal is in the form of a continuous wave.eg, sine wave

1. Digital signal is in the form of a pulse code ie, 0 and 1.

2.  Analog signal looks like:

     

2.  Digital signal looks like:

     

 Functions of:

      (i)       Transducer: It converts one form of energy to another. Or it converts some physical variable like:     

                 pressure, displacement etc to corresponding variation in electrical signal.

      (ii)       Repeater: It picks up signal from transmitter and then amplifies it and further retransmits it to the

                 receiver.

                 Repeaters are used to extend the range of communication.

      (iii)      Transmitter: it is an arrangement that converts the message signal to a form suitable for transmission

                 and then transmits it through suitable communication channel.

      (iv)      Bandpass filter: A band pass filter allows a band of frequencies to pass though and rejects frequencies

                 higher/lower than that band.

Answered by | 10 Jul, 2014, 07:54: PM
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