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Amplitude Modulation
Amplitude Modulation - When the amplitude of high frequency carrier wave is changed in accordance with the intensity of the signal, it is called amplitude modulation. In amplitude modulation, only the amplitude of the c..
Amplitude Modulation - When the amplitude of high frequency carrier wave is changed in accordance with the intensity of the signal, it is called amplitude modulation. In amplitude modulation, only the amplitude of the c..Amplitude Modulation
When the amplitude of high frequency carrier wave is changed in accordance with the intensity of the signal, it is called amplitude modulation..
Different Types of Modulation
In this type if modulation, w c and q are kept constant. The amplitude E c of the carrier wave is varied in accordance with the modulating wav..
Different Types of Modulation
Consider a carrier wave represented by Here e c is instantaneous value, E c is amplitude (maximum value), w c is angular frequency and q is the phase angle of carrier voltage. Corresponding to the three variables E c , w c and q, we can have three different types of modulat..
Consider a carrier wave represented by Here e c is instantaneous value, E c is amplitude (maximum value), w c is angular frequency and q is the phase angle of carrier voltage. Corresponding to the three variables E c , w c and q, we can have three different types of modulat..Disadvantages of Amplitude Modulation
Low Efficiency - In amplitude modulation, the sidebands contain the signal. The power in the sidebands is the only useful power. The power carrier by the side bands is only 33.3% even when there is 100% modulation. If modulation is 50%, then power carried by ..
Amplitude Modulated Transmission
The amplitude-modulated band (AM band) contains the radio waves having frequency of less than 30 MHz or having wavelength of 10 m or more. The lower atmosphere is more or less transparent to radio waves. However, the ionosphere reflects back the radio waves. Thus, a signal emitted by an ..
Need for Frequency Modulation
(i) Various electrical machines and noises cause amplitude disturbance in the transmission of amplitude-modulated wave. This makes the reception noisy. So, there is a need for different type of modulation, which can reduce the noise factor. Frequency mod..
Principles of Light Modulation
Let us consider the case of electromagnetic radiation in an ionised medium. Suppose we increase/decrease the amplitude of an electromagnetic wave passing through an ionised gas. These modulations of the electromagnetic wave could contain coded information (Morse code for exampl..
Modulation Factor
The ratio of change of amplitude of carrier wave to the amplitude of normal carrier wave is called the modulation factor ..
The ratio of change of amplitude of carrier wave to the amplitude of normal carrier wave is called the modulation factor ..Frequency Modulation
In frequency modulation, the frequency of the carrier wave is modified in accordance with the amplitude of the modulating wav..
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