Design of Non-recursive Digital Filters
Trevor J. Terrell · 1980
Non-recursive digital filters have a weighting sequence (impulse response), g(i)T, which is finite in length, and consequently this type of filter is commonly referred to as a finite impulse response (FIR) filter. The term non-recursive intrinsically means that the output of the filter, y(n)T, is computed using the present input, x(n)T, and previous inputs, x(n − 1)T, x(n − 2)T,…, and furthermore the filter has no inherent feedback, which means that previous output values, y(n − 1)T, y(n − 2)T,…, are not used in the computation of y(n)T. Figure 3.1 shows a typical example of a non-recursive filter; the arrangement shown is a digital transversal filter.l