10

Finite Impulse Response Digital Filters

10.1    Introduction

At the beginning of this chapter, we give a brief description of the finite impulse response (FIR) digital filter and an example that we hope will motivate us in approaching this huge topic of digital filtering.

10.1.1    What Is an FIR Digital Filter?

An FIR digital filter is a system with input x(n) and output y(n). The output y(n) at any discrete value n depends on the present and past values of x(n) and not on the current or past values of y(n). This type of system is known as a nonrecursive system.

As we will see later, FIR digital filters are known for their finite duration responses where the impulse response, h(n), of an FIR filter is nonzero for n = 0,…, N ...

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