Question

Modulation is done in ________

(a) Receiver

(b) Transducer

(c) Between transmitter and radio receiver

(d) Transmitter

This question was posed to me in class test.

My doubt is from Transmitter in division Elements of Communication System of Analog Communications

Answer 1

Right answer is (d) Transmitter

The explanation is: Transmitter modulates the signal to be transmitted, by varying one of the properties of a carrier signal with respect to the instantaneous amplitude of the message signal. This process is known as modulation. Receiver demodulates the modulated signal to extract the message signal. Transducer converts the electrical signal to sound wave. Between the transmitter and the radio receiver, is the channel which acts as the medium of transmission.