Multirate DSP models for gene detection

Digital filtering techniques such as the sliding window DFT and IIR anti-notch filters can be used as tools to identify the protein coding region in a DNA sequence. A multirate DSP model that emulates a complex anti-notch digital filter has been recently introduced. It was shown through simulations that this specific model is most effective in generating the so-called DNA spectrum when compared to previous digital filtering approaches. The improvement in performance is however offset by a higher computational cost. In this paper, we propose a new and efficient IIR implementation of this complex filtering process that does not sacrifice performance. The new implementation uses real causal stable IIR filters and removes the background noise in the DNA spectrum by a simple averaging operation. A mathematical analysis of the newly proposed scheme is also presented.