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Appendix F: A Note on
Digital Sound
Traditionally, sound has been recorded in
analog format. Magnetic tape is an
example of the media used by analog
recording. Analog audio uses electrical
signals to create a single model of a given
sound or “waveform” as shown below:
Digital sound applies computer-based
technology to the recording, handling,
and regeneration of sound. A digital
waveform reduces the sound to a
sequence of binary numbers. Digital
audio systems sample the waveform and
extrapolate the complete sound from the
sample. When a digital recording is
played, the numeric data is transformed
back to its original acoustic waveform.
Tradeoffs
While the quality of a digital sound
recording is subject to almost no
degradation (unlike an analog recording),
digital sound storage requirements are
quite high in terms of computer hard disk
space.
0 1 0 1
0
0 1
1
0
Time interval
Digital Waveform
Amplitude
Time interval
Analog Waveform
Amplitude
A Note on Digital Sound