Chapter 3
Basics of Audio in MATLAB®Creating, Importing, and Indexing Arrays
3.1 Introduction: Digital Audio Signals
An audio signal can be represented as a function of amplitude over time: . When the signal is in the form of acoustic sound in physical space, it is a function of sound pressure over time. A microphone converts sound pressure to another form: electricity. In this case, the audio signal is a function of voltage over time or current over time. Sound pressure and electricity are functions of continuous time, meaning an amplitude value exists for all time during a signal.
A computer processes another form of the audio signal, a digital respresentation. The values in a digital signal are based on sampled (i.e., measured) amplitude ...
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