Mention the functions of any two of the following used in a communication system: (i) Transducer (ii) Repeater (iii) Transmitter (iv) Bandpass Filter

(i) A transducer converts one form of energy to another. (ii) A repeater picks up signals from the transmitter, amplifies it, and transmits it to the receiver. (iii) A transmitter comprises a signal source, modulator, and transmitting antenna. The transmitter makes the signal compatible for the communication channel. (iv) A bandpass filter is a device that passes energy with only one frequency.