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Pro Android Media: Developing Graphics, Music, Video, and Rich Media Apps for Smartphones and Tablets by Shawn Van Every

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Digital Audio Synthesis

Digital audio synthesis is a very broad topic with a great deal of theory, mathematics, engineering, and history behind it. Unfortunately, most of the topic overall is out of the scope of what can be covered in this book. What we will do is look at some basic examples on how we can harness a few built-in classes on Android to create audio from scratch.

As you probably know, sound is formed by a repetitive change in pressure in air (or other substance) in the form of a wave. Certain frequencies of these oscillations, otherwise known as sound waves, are audible, meaning our ears are sensitive to that number of repetitions in a period of time. This range is somewhere between 12 Hz (12 cycles per second), which is a very low ...

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