Chapter Seven. Specialized Lowpass FIR Filters

Specialized Lowpass FIR Filters

In this chapter we present two implementations used to build computationally efficient, linear phase, finite impulse response (FIR) filters. We discuss these special FIR filters now because their behavior will be easier to understand using the z-transform concepts introduced in the last chapter.

The first filter type presented is called frequency sampling filters. They are in that special class of linear phase finite impulse response (FIR) filters built with recursive structures (using feedback). The Section 7.1 material is a bit advanced for DSP beginners, but it deserves study for two reasons. First, ...

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