Implementation of a multirate IIR filter
Independent thesis Basic level (professional degree)Student thesisAlternative title
Implementering av multirate IIR filter (Swedish)
In this report a two-stage multirate IIR filter has been modelled and simulated in the Simulink. For its realization, the multirate structure for narrow-band and middle-band filters and the multirate structure for the wide- band filters have been used. In Simulink, the different filter elements within the two-stage multirate IIR filter have been modelled separately and subsequently they have been interconnected into the two-stage multirate structure. This overall two-stage multirate IIR filter makes use of half-band FIR filters to alter the sampling frequency, an IIR filter for the actual filtering and allpass filters to construct complementary filters. Once the two- stage multirate IIR filter has been designed, the scaling coefficients have been introduced into the filter structure. The same filter specifications as that used for the multirate IIR filter designing were also used for the singlerate IIR filter modelling. Simulink was used for the simulation of the singlerate IIR filter, as well. When designed, the singlerate IIR filter has been used as a reference filter for the determination of the roundoff noise and the data word length of the multirate IIR filter. One aspect found is that the roundoff noise of the multirate IIR filter is slightly larger than that obtained by a singlerate IIR filter.
Place, publisher, year, edition, pages
Institutionen för systemteknik , 2003. , 47 p.
Electronics, multirate IIR filter, half-band FIR filters, decimation, interpolation, scaling, roundoff noise
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-1727OAI: oai:DiVA.org:liu-1727DiVA: diva2:19052