BIEB 166 Lecture Notes - Lecture 15: Amplitude Modulation, Sine Wave, Fourier Analysis
8 Nov 2013
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Breakdown the complex sound in to simpler components. Complex sound is a simple sum of its parts and different parts do not interfere or interact with each other. When two waves travel in opposite direction towards one another, they temporary add up, and then go the other way. This linearity makes analysis easier and it makes it possible for our ears to break sound down into its component frequencies. How frequency and amplitude change over time. Time in the x-axis and amplitude in the y-axis: amplitude modulation. In many cases, animals have evolved communication systems that are sensitive to temporal characteristics of the signal. The male is waving the wings around the female. The way he waves his wings creates a near-field sound. The ones that are closely related tends to have songs that are very similar. Pulses of sound: each pulse = 1 wave. All of these species have their very specific type of sound/amplitude modulation.
