The process of changing some characteristic of a carrier wave in accordance with the intensity of the signal is called.

The process of changing some characteristic of a carrier wave in accordance with the signal to be transmitted is called

The process of changing the amplitude of a carrier wave in accordance with the amplitude of the audio frequency signal (AF) is known as

Statement 1. The process of changing the amplitude of a carrier wave in accordance with the amplitude with the basic voice frequency (VF) or audio signal (AF) is known as amplitude modulation (A.M.) Statement 2. Modulation is the process of variation of some characteristic of a high frequency wave any manner.

In FM, the _________ of carrier wave is changed in accordance with the intensity of the signal.

The process of variation of some characteristic of a high frequency wave (i.e., carrier wave) in accordance with the instantaneous value of an audio signal is called

Fill in the blank spaces with appropriate answers. Amplitude modulation is the process in which the ________ of the carrier is varied in accordance with the intensity of the audio signal. (amplitude/frequency).

The process in which phase of carrier wave changes in accordance with instantaneous value of modulated signal is

The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. The fraction of total power carried by side band frequencies is