(nb, at) ¶(nb, at, linear) ¶Computes a finite impulse response (FIR) filter for use with a quasi-perfect reconstruction polyphase-network filter bank. This version utilizes a Kaiser window to shape the frequency response of the designed filter. Tha number nb of bands and the desired attenuation at in the stop-band are given as parameters.
The Kaiser window is multiplied by the ideal impulse response h(n)=a.sinc(a.n) and converted to its minimum-phase version by means of a Hilbert transform.
By using a third non-null argument, the minimum-phase calculation is omitted at all.
Package: signal