Fast state-space decimator with very low round-off noise |
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Authors: | Jan Zeman Allen G Lindgren |
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Affiliation: | Institut für Fernmeldetechnik, Swiss Federal Institute of Technology (ETHZ), CH-8092 Zürich, Switzerland |
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Abstract: | A method for the efficient realization of high-order Infinite Impulse Response (IIR) output-decimating State-Space Digital Filters (SSDF) is presented. By applying the state decimation and block processing to the nth-order narrow-band SSDFs, computational efficiency as well as low round-off noise levels are achieved. Further, the favorable behavior of certain SSDF forms with respect to the overflow limit cycles is retained. Such Fast State-Space IIR Decimators (FSSD) are simple to design, have multiplication rates comparable to Finite Impulse Response (FIR) decimators, have a highly parallel processing algorithm, and are very easy to implement on programmable signal processors. In the digital filter applications which do not require the linear-phase response, the FSSD may be considered as an alternative to a single-stage FIR decimator for moderate decimation factors. |
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Keywords: | IIR decimators digital filters state-space digital filters block signal-processing state decimation multirate filters |
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