High-Performance Digital Filters

Abstract

There may be no other signal-processing tool more widely used in embedded software than the digital filter because even the simplest applications usually read some kinds of input signals that need filtering. In this chapter, we will implement several types of finite impulse response (FIR) filters. The first section of this chapter presents a simple order 1 floating-point FIR filter. In order to obtain high performance for filters on microcontrollers without a floating-point unit or digital signal processor (DSP), however, the filters in the rest of this chapter use pure-integer mathematics combined with template design.