amplitude modulation vs frequency modulation vs phase modulationThis page on amplitude modulation(AM) vs frequency modulation(FM) vs phase modulation(PM) describes difference between amplitude modulation,frequency modulation and phase modulation types.All these modulation types are analog modulation techniques. All the modulation types are used to transmit information from one place to the distant place. Mostly this techniques are employed in wireless communication.For any analog modulator type, there are two inputs and one output. The two inputs are modulating signal (i.e. analog information to be transmitted) and carrier signal waveform. The output is referred as modulated waveform. Amplitude Modulation(AM)Amplitude Modulation(AM) is the modulation technique in which carrier amplitude varies based on analog baseband information signal to be transmitted using wireless device.one of the application of amplitude modulation is radio. AM broadcast signals are mainly propagated by ground waves during the day and by sky waves at night time. Advantages, disadvantages and applications of AM
Different amplitude modulation techniques have their own advantages and disadvantages as mentioned
below: Frequency Modulation(FM)Frequency Modulation(FM) is the modulation technique in which carrier frequency varies based on analog baseband information signal to be transmitted using wireless device. Frequency modulation is considered to be superior compare to the Amplitude modulation due to better noise immunity and its ability to reject the interfering signals due to the capture effect. Advantages, disadvantages and applications of FM
· Advantages: Increased immunity to noise. Phase Modulation(PM)Phase Modulation(PM) is the modulation technique in which carrier phase varies based on analog baseband information signal to be transmitted using wireless device. If a constant amplitude as well as constant frequency sine wave carrier is given to the phase shifter the output is phase modulated signal. Phase modulation is referred as indirect frequency modulation due to the fact that phase modulation produces frequency modulation. The effect of variation in amount of phase shift is proportional to change in the carrier frequency. Advantages, disadvantages and applications of PM
· Advantages: Increased immunity to noise. Following table mentions difference between AM, FM and PM modulation techniques.
This page provides comparison between AM FM and PM analog modulation types. Similarly the page ASK vs FSK vs PSK describes comparison between ASK FSK and PSK digital modulation types. |
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