tailieunhanh - Lecture Digital signal processing: Lecture 7 - Zheng-Hua Tan

Lecture Digital signal processing - Lecture 7 presents the following content: Filter design, IIR filter design, analog filter design, IIR filter design by impulse invariance, IIR filter design by bilinear transformation. | Course at a glance MM3 MM9 MM10 2 Digital Signal Processing VII Zheng-Hua Tan 2006 AALBORG UNIVERSITY 1 Part I Filter design Filter design IIR filter design Analog filter design IIR filter design by impulse invariance IIR filter design by bilinear transformation Digital Signal Processing VII Zheng-Hua Tan 2006 Filter design process Filter in broader sense covers any system. Three design steps Problem Performance constraints System function Solution Specifications Approximations realization Magnitude response Phase response frequency domain Complexity IIR or FIR Subtype Structure Digital Signal Processing VII Zheng-Hua Tan 2006 2 Specifications - an example Specifications for a discrete-time lowpass filter 1 - H e a 1 0 a ap H e . . . l-Sj 5. Ổ1 Ổ2 Passband I Transition J Stopband 82 0 Specifications of frequency response Typical lowpass filter specifications in terms of tolerable Passband distortion as smallest as possible Stopband attenuation as greatest as possible Width of transition band as narrowest as possible Improving one often worsens others a tradeoff Increasing filter order improves all 6 Digital Signal Processing VII Zheng-Hua Tan 2006 AALBORG UNIVERSITY