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#X text 8 7 How do we represent sound digitally?;
#X text 8 89 How can we represent sound as a finite collection of numbers
that can be stored efficiently \, in a finite amount of space \, on
a computer \, and played back and manipulated at will?;
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#X text 40 370 Time Domain Time-domain representations show us a lot
about the amplitude of a signal at different points in time. Amplitude
is a word that means \, more or less \, "how much of something \, "
and in this case it might represent pressure \, voltage \, some number
that measures those things \, or even the in-out deformation of the
eardrum.;
#X text 582 366 Frequency Domain Distinguishing between sounds is one
place where the frequency domain comes in. Figure is a frequency/amplitude/time
plot of the same sound as the time-domain picture in. This new kind
of sound-image is called a sonogram. Time still goes from left to right
along the x-axis \, but now the y-axis is frequency \, not amplitude.
Amplitude is encoded in the intensity of a point on the image: the
darker the point \, the more energy present at that frequency at around
that time.;
#X text 46 531 000_03MUSIC_time-domain-sampling;
#X text 47 554 Music examples;
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