Design of IIR frequency-response masking filters with near linear phase using constrained optimization
Qinglai Liu, Yong Ching Lim, Zhiping Lin, Xiaoping Lai · 2017
IIR frequency-response masking (FRM) filter where the prototype filter is an IIR filter and the masking filters are FIR filters is effective in reducing the group delay of FRM filters. In this paper, we present a constrained optimization method for the design of near linear phase IIR FRM filters, where the phase error and magnitude error are independently controlled. A design example is presented to demonstrate the performance of the method.