15
Digital Signal Processing
Even the humble Arduino Uno is capable of fairly rudimentary signal processing. This chapter discusses a variety of techniques, from conditioning a signal from an analog input using software rather than external electronics to calculating the relative magnitude of various frequencies in a signal using a Fourier Transform.
Introducing Digital Signal Processing
When you take readings from a sensor, you are measuring a signal. It is common to visualize that signal as a line (usually wavy) moving from the left of the page to the right over time. This is how electrical signals are viewed on an oscilloscope. The y-axis is the amplitude of the signal (its strength) and the x-axis is time. Figure 15-1 shows some music captured ...
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