Abstract
A common lay definition of the verb to modulate is “to tune to a certain key or pitch.” In amplitude modulation, this is precisely what is being done; namely, the information to be transmitted, hereafter called the message signal, is moved to another location in the frequency spectrum. This relocation is easily accomplished by multiplying the message signal by a pure sinusoid; however, one may wonder why we wish to modulate the message signal at all. A little thought produces several excellent reasons.
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Notes
- 1.
This development is due to J. L. LoCicero (private correspondence, 1984). A similar treatment appears in Lathi (1968).
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Gibson, J.D. (2023). Amplitude Modulation. In: Analog Communications. Synthesis Lectures on Communications. Springer, Cham. https://doi.org/10.1007/978-3-031-19584-6_1
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DOI: https://doi.org/10.1007/978-3-031-19584-6_1
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