question_answer

Explain briefly the following terms used in communication system: (i) Transducer     (ii) Repeater (iii) Transmitter (iv) Bandpass filter (v) Amplification                

Answer:

                (i) Transducer. It is a device which converts energy from one form to another form. (ii) Repeater. It is a combination of receiver, amplier and transmitter. It picks up a signal from the transmitter, amplifies and transmits it to the receiver sometimes with a change of carrier frequency. (iii) Transmitter. It is a device which processes the incoming message signal into a form suitable for transmission through a channel and for its subsequent transmission. (iv) Bandpass filter. A bandpass filter blocks lower and higher frequencies and allows only band of frequencies (centred around carrier frequency) to pass through it. (v) Amplification. It is the process of increasing the amplitude and hence the strength of an electrical signal by using an electric circuit (consisting of atleast one transistor) called the amplifier.