Signal processor implementation of variable digital filters
Petri Jarske, Sanjit K. Mitra, Yrjo A. Neuvo · IEEE Transactions on Instrumentation and Measurement · 1988
The implementation of two recently introduced variable digital filter schemes using a TMS320-series digital signal processor is presented. One is a method for updating the coefficients of an FIR (finite-impulse response) filter in a simple manner such that the cutoff frequencies can be controlled through a single parameter. The other is a method for tuning the cutoff frequency of an IIR (infinite-impulse response) filter with one parameter using a series expansion of the low-pass-low-pass frequency transformation. The measured frequency responses compare well with the theory.>