Implementation Considerations and Performance Comparison of Variable Bandwidth FIR Filter and Phase Equalized IIR Filter
fred harris, Wade Lowdermilk · 2018 52nd Asilomar Conference on Signals, Systems, and Computers · 2007
The number of taps in a FIR filter varies inversely with the filter's transition bandwidth. A FIR filter with variable bandwidth and with a proportional transition bandwidth must also be of variable length. To avoid changing the number of taps in the FIR filter we describe a phase equalized IIR filter with weights that can be tuned to obtain the variable bandwidth, variable length impulse response without requiring a variable number of multiplies.