A Family of Efficient Complex Halfband Filters
نویسندگان
چکیده
Halfband lowpass and bandpass filters, versatile building blocks in a multitude of DSP applications, are revisited. Linear-phase FIR and minimum-phase IIR halfband filters for sample rate alteration are recalled, their computational loads are compared, and optimum signal flow graphs are presented. The same comparisons are carried out for corresponding complex halfband filters (Hilbert-transformers) with and without an additional frequency offset by ∆Ω = ±π/4. As expected, the smaller the transition width between passband and stopband the higher the relative advantage of the IIR approach in terms of computation. Yet, there exist ranges of specifications where linearphase FIR halfband filters outperform their minimum-phase IIR counterparts.
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