The radio broad casting in modulation process - Amplitude modulation-Frequency modulation-Phase modulation
Radio
A high-frequency radio wave is used to carry the audio signal. On adding the audio signal to the carrier, any one of the characteristics namely amplitude frequency or phase of the carrier wave is changed in accordance with the intensity of the audio signal. This process is known as modulation.
There are three types of modulation processes used to change carrier waves listed below.
There are three types of modulation processes used to change carrier waves listed below.
- Amplitude modulation
- Frequency modulation
- Phase modulation
Amplitude modulation
It is the process by which the amplitude of the carrier wave is changed in accordance with the instantaneous value of the modulating voltage keeping the frequency and the phase angle constant.
A amplitude modulation only a small amount of audio power is required so it is a simple method but plate efficiency is low, and output power so that Frequency modulation is advanced.
Frequency modulation
It is a process by which the frequency of the carrier wave is changed in accordance with the instantaneous value of the modulating voltage keeping the amplitude constant.
The amount by which the carrier frequency is varied from its modulated value depends upon the amplitude of the modulating signal. The rate at which the variation takes place is determined by the frequency of the modulating signal.
FM is more advantageous than AM. An AM wave distorted by man-made and natural noise AM leads to noisy reception but FM remove the noise.
Phase modulation
It is a process by which the phase of the carrier wave is changed in accordance with the instantaneous value of the modulating voltage keeping the amplitude of frequency constant.
The phase modulation generally uses a smaller bandwidth than FM. Phase modulation facilitates the highest transmission speeds on a given bandwidth.
It is a process by which the frequency of the carrier wave is changed in accordance with the instantaneous value of the modulating voltage keeping the amplitude constant.
FM is more advantageous than AM. An AM wave distorted by man-made and natural noise AM leads to noisy reception but FM remove the noise.
Phase modulation
It is a process by which the phase of the carrier wave is changed in accordance with the instantaneous value of the modulating voltage keeping the amplitude of frequency constant.
The phase modulation generally uses a smaller bandwidth than FM. Phase modulation facilitates the highest transmission speeds on a given bandwidth.
The radio broad casting in modulation process - Amplitude modulation-Frequency modulation-Phase modulation
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January 09, 2019
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