‫Now, these modulation schemes can be analogue and they can also be digital.
‫For example, this is the message signal in order to modulate this message signal.
‫We need to get higher frequency, which is represented by this waveform.
‫And in the case of amplitude, more relation, we will vary the amplitude of the area according to the
‫message signal, for example, as the amplitude of the message signal is increasing.
‫We are also increasing the amplitude of the area.
‫And as the message signal is decreasing, we are also decreasing the amplitude of the area.
‫And when this message signal has minimum value, the carrier also has the minimum amplitude.
‫While in the case of frequency modulation, we change the frequency of the carrier with the message
‫signal.
‫For example, as the value of the message signal is increasing, we see that the frequency of the carrier
‫is being increased.
‫And as the message signal is being decreased, the carrier, the frequency of the carrier is being decreased.
‫In at this point, for the minimum message signal amplitude, we have the minimum frequency.
‫This type of modulation is called as the frequency modulation.
‫So in short, the modulation is a process in which, according to the message signal, we very either
‫the amplitude of the area or the frequency of the carrier already fears of TKD.
‫For example, if this is the mathematical representation of the carrier, then in the amplitude modulation,
‫we very deep amplitude of the carrier in accordance with deep message signal in the frequency modulation.
‫We change the frequency of the carrier in accordance with the message signal.
‫And in the case of phase modulation, we change the features of the carrier in accordance with the message
‫signal.
‫So these are three main types of the modulation techniques.