Learning Team Analog And Digital Comparison Paper
Modulation is a technique in which a signal is imbedded in another signal which is known as the carrier signal. Modulation makes it possible to increase the quality of the signal, use smaller antenna, and have more flexibility for bandwidth adjustments. Modulation type is dependent on whether it is angular or amplitude.
Angular modulation or sinusoidal angular modulation “is the variation in the angle of a sine-wave carrier “ (angle modulation, 2015)phase modulation and frequency modulation are examples of this from of modulation.
In frequency modulation or FM the carrier signal is altered while the message signal remains constant. Some advantages of the form of modulation is it is less susceptible to signal interference or noise this is why they are mainly used in broadcasting and radio communications Frequency modulation has a special effect called capture effect in which high frequency signal will capture the channel and discard the low frequency or weak signals from interference (Electronicshub, 2013). Frequency modulation does have some disadvantages. One being although no special equipment is needed to transmit the signal demodulators are needed to separate the carrier and message signals. Possibly the biggest disadvantage is FM does not have the ability to bounce of building and other structures that may impede its path.
The second form of angular modulation is phase modulation. Phase Modulation is a method of impressing data onto an alternating-current (AC) waveform by varying the instantaneous phase of the wave (Poole, 2008). The main advantage of phase modulation is static interference I less common. This is why unlike FM we can use phase modulation to determine speed. This comes in handy for radar guns and other motion detection devices. The major disadvantage of phase modulation is as we increase the phase modulation index, and data loss is more and we need special equipment like frequency multiplier for increasing the phase
Angular modulation or sinusoidal angular modulation “is the variation in the angle of a sine-wave carrier “ (angle modulation, 2015)phase modulation and frequency modulation are examples of this from of modulation.
In frequency modulation or FM the carrier signal is altered while the message signal remains constant. Some advantages of the form of modulation is it is less susceptible to signal interference or noise this is why they are mainly used in broadcasting and radio communications Frequency modulation has a special effect called capture effect in which high frequency signal will capture the channel and discard the low frequency or weak signals from interference (Electronicshub, 2013). Frequency modulation does have some disadvantages. One being although no special equipment is needed to transmit the signal demodulators are needed to separate the carrier and message signals. Possibly the biggest disadvantage is FM does not have the ability to bounce of building and other structures that may impede its path.
The second form of angular modulation is phase modulation. Phase Modulation is a method of impressing data onto an alternating-current (AC) waveform by varying the instantaneous phase of the wave (Poole, 2008). The main advantage of phase modulation is static interference I less common. This is why unlike FM we can use phase modulation to determine speed. This comes in handy for radar guns and other motion detection devices. The major disadvantage of phase modulation is as we increase the phase modulation index, and data loss is more and we need special equipment like frequency multiplier for increasing the phase
References: angle modulation. (2015). Retrieved from the free dictionary: http://encyclopedia2.thefreedictionary.com/angle+modulation Electronicshub. (2013). Modulation and Different Types of Modulation. Retrieved from electronicshub.org: http://www.electronicshub.org/modulation-and-different-types-of-modulation/ Poole, I. (2008). What is PM, Phase Modulation. Retrieved from radio-electronics: http://www.radio-electronics.com/info/rf-technology-design/pm-phase-modulation/what-is-pm-tutorial.php