Question

Define modulation and transducer.

Answer 1

Hint: Both of the terms given in the question are related to the parts of the communication system. A modulation is the process of transmitting a message signal with the help of a carrier signal. And a transducer is a device which is used for converting one form of energy into the other.

Complete answer:
Modulation is an important process used in communication. In this, the properties of a periodic signal, called the carrier wave, are varied in accordance with a given message signal which is to be transmitted. The examples of such properties are the amplitude, the frequency, or the phase. The variations in the properties of the carrier signal are interpreted by the receiver and hence the message signal is received.
The scheme modulation is named according to the property of the carrier which is being varied. For example, if the amplitude is varied then the modulation scheme is known as the amplitude modulation. On the other hand, if the frequency is varied, then the scheme of modulation is called the frequency modulation.
A transducer is a device which is used for converting any physical quantity into electrical signals. It basically generates equivalent amounts of the voltages or the currents, which are proportional to the physical quantity being converted. The examples of the physical quantities include pressure, density, temperature etc.

Note: A transducer is a very important device used in many engineering applications. For example, it is used in the antennae, disk readers and writers, for converting the electromagnetic fields to electric signals. Also it is used in various electromechanical devices such as galvanometers, accelerometers, potentiometers etc. It is also used in earphones, loudspeakers, microphones for converting the sound energy into electrical signals and vice-versa.