Modulation is a process of varying one or more periodic waveform properties with a modulating signal that typically contains the data to be transmitted. Most of the radio systems in the 20^th century either used amplitude modulation or frequency modulation for radio broadcasting.

The basic concept of modulation is that a message signal can be transferred to the channel from its original forms through distortion. Here, a message signal is superimposed over a carrier having a high amplitude, energy, and frequency (Muduli, 2010). Whether its 30 feet or 30,000 miles, modulation is always needed for communication. In modulation data of some sort (digital data, voice, among many more) is added to the carrier. Modulation is also applied in the case of Morse code where a signal is turned on and off at different intervals.

The type of modulation that I chose is amplitude modulation. In this type of modulation, the carrier wave signal strength is varied in proportion to that of the message signal being transferred.  In this case, the phase and frequency are kept constant while the signal amplitude is changed in proportion to the message signal.

In comparison with the other types of modulation, amplitude modulation is different from phase and frequency modulation. The main difference is that in amplitude modulation, the carrier wave is modified according to the data while in frequency modulation, the frequency of carrier wave is adjusted as per the data transmit (Lahvis, 2011). On the other hand, in phase modulation, the carrier wave phase varies as per the voltage of the modulating signal input (Wu, 2012). The similarities between amplitude, frequency, and phase modulation are that they are all used to transmit information from one place to a distance place.

References

Muduli, P. K., Pogoryelov, Y., Bonetti, S., Consolo, G., Mancoff, F., &Åkerman, J. (2010). Nonlinear frequency and amplitude modulation of a nanocontact-based spin-torque oscillator. Physical Review B, 81(14), 140408.

Lahvis, G. P., Alleva, E., &Scattoni, M. L. (2011). Translating mouse vocalizations: prosody and frequency modulation 1. Genes, Brain and Behavior, 10(1), 4-16.

Wu, F. M., Lin, C. T., Wei, C. C., Chen, C. W., Huang, H. T., & Ho, C. H. (2012). 1.1-Gb/s white-LED-based visible light communication is employing carrier-less amplitude and phase modulation. IEEE photonics technology letters, 24(19), 1730-1732.

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