Implementation of reduced IIR digital filters
ABSTRACT This paper considers power consumption of order reduced IIR filters. Power consumption is here described by parameters that depict activities of basic filter components as multipliers, adders and delay elements. Filter structure plays an important role in power consumption. Here we selected cascade second order section (CSOS) as an optimal structure because of its very stable scaled coefficients. A major factor that affects activities of filter elements is the representation of filter coefficients. We compared influence of standard twos complement representation of numbers and promising canonical sign digit representation (CSD) on filter multiplier activities.
- SourceAvailable from: Tughrul Arslan
Conference Proceeding: Low power system on chip implementation scheme of digital filtering coresLow Power IC Design (Ref. No. 2001/042), IEE Seminar on; 02/2001
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ABSTRACT: An improved algorithm for Hankel-norm optimal approximation of FIR by IIR discrete-time transfer functions is given which results in a straightforward and computationally efficient implementation which is less error-prone than previous approachesElectronics Letters 03/1994; · 1.04 Impact Factor
Conference Proceeding: Design of linear phase IIR filters via weighted least-squares approximation[show abstract] [hide abstract]
ABSTRACT: A new method for designing IIR digital filters with linear phase in the passband is proposed. This method is based on frequency-weighted least-square error optimization using the Broyden-Fletcher-Goldfarb-Shanno (BFGS) method. The gradient of the cost function with respect to the design parameters, required for the implementation of the BFGS method, is derived. The proposed method is started by obtaining an initial IIR filter design using model reduction of a linear phase FIR filter. Based on this initial design the cost function is minimized using the BFGS method. An example shows that the proposed method leads to very good filter designsAcoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on; 02/2001 · 4.63 Impact Factor