Digital Sound & Music: Concepts, Applications, & Science, Chapter 2, last updated 6/25/2013
Figure 2.21 Example impulse response graph
Figure 2.22 Example frequency response graph
Figure 2.23 Example phase response graph
The impulse response graph shows the amplitude of the sound wave over time. The data
used to draw this graph are produced by a microphone (and associated digitization hardware and
software), which samples the amplitude of sound at evenly-spaced intervals of time. The details
of this sound sampling process are discussed in detail in Chapter 5. For now, all you need to
understand is that when sound is captured and put into a form that can be handled by a computer,
it is nothing more than a list of numbers, each number representing the amplitude of sound at a
moment in time.
Related to each impulse response graph are two other graphs a frequency response
graph that shows “how much” of each frequency is present in the instance of sound, and a phase
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