S.S. Lawson

Bio: S.S. Lawson is an academic researcher from University of Warwick. The author has contributed to research in topics: Multiplier (economics) & Digital filter. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.

Design of wave digital filters with prescribed magnitude and phase requirements

Abstract: Investigates the design of digital filters, with arbitrarily specified magnitude and phase (or delay) characteristics. We shall be looking in particular at Wave Digital Filters because of their known superior performance in respect of round-off noise and coefficient quantization error. The emphasis in this paper is the preservation of filter structure and the use of optimization to find a suitable set of multiplier coefficient values. Results are given to illustrate the current progress in this research. >

Design of cascaded allpass structures with magnitude and delay constraints using simulated annealing and quasi-Newton methods

Abstract: For high sampling rate applications it is useful if the digital filter structure is efficient in the sense of a minimum number of arithmetic operations for a given order. In addition, requirements for satisfying the stringent magnitude and delay specifications lead to the choice of non-minimum phase transfer functions. To this end, a filter structure is considered which is made up from all-pass sections. Two design approaches are examined using classical optimization and simulated annealing. Design examples are provided which illustrate the efficacy of these techniques. >