Digital filter design for a PAL TV modulator

This paper develops a baseband digital filter design for the Vestigial SideBand (VSB) filtering required in the traditional analog TV transmission system, PAL. In this application, a filter with a relatively narrow passband and steep transition band is needed. Furthermore, the group delay specifications for the filter are demanding. An efficient solution satisfying the amplitude response specifications is developed based on Nth-band filters, which can be either of the FIR or the IIR type. The group delay response specifications can be satisfied by using either linear-phase FIR filters or approximately linear-phase IIR Nth-band filters. The latter approach seems to be more efficient for this application and is developed further