Mention the function of any two of the following used in communication system:

(i) Transducer                                       (ii) Repeater

(iii) Transmitter                                    (iv) Band pass Filter

i) Transducer: A device which converts energy from one form to another form. It is used in microphone for converting sound energy into electrical energy and vice-versa.

ii) Repeater: It is a combination of a receiver and a transmitter. It is used in transmission system to regenerate the signal by picking up a signal, amplifying it and then transmitting it to the receiver.

iii) Transmitter: A device which processes the incoming message signal so as to make it suitable for transmission through a channel and for its subsequent reception.

iv) Bandpass filter: A device which allows only signals of a certain frequency range and blocks the rest of the frequencies. It is used in an electronic filter.