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Digital Signal Processing 101 by Michael Parker

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CHAPTER 7Decimation and Interpolation

In this chapter, we discuss decimation and interpolation. Decimation is the process of reducing the sample rate Fs in a signal processing system, and interpolation is the opposite, increasing the sample rate Fs in a signal processing system. These processes are very common in signal processing systems and are nearly always performed using an FIR filter.

First, why are sampling rates changed? The most common reason is to ease the interface of the digital signals to the outside environment. As we saw in previous chapters, signals have a frequency representation, and this frequency representation must be less than the Nyquist frequency, which is defined as Fs/2. This sets a lower bound on Fs. The amount of hardware ...

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