| Abstract: | In the frequency-response masking (FRM) approach, the complexity of two
masking filters is heavily dependent on the interpolation factor and the cutoff frequencies
of the bandedge shaping filter. In this paper, we propose a novel structure that decouples
the masking filters from the bandedge shaping filter. The design equations together with the
design procedures are presented. With the introduction of an additional decoupling stage,
the complexity of the overall filter can be greatly reduced. Our example shows that more
than 40% savings in the numbers of multipliers and adders can be achieved compared with
the original FRM approach. |
