EEET 0770 Digital Filter Design Digital Filters Design
- Slides: 38
EEET 0770 Digital Filter Design ���������� Digital Filters Design Chapter 3 Digital Filter Structures Asst. Prof. Dr. Peerapol Yuvapoositanon, Ph. D, DIC Department of Electronic Engineering and Graduate School of Electrical Engineering Centre of Electronic Mahanakorn Systems and University of Technology Digital Signal Processing 1
EEET 0770 Digital Filter Design ��������� (��� ( ตวกรองอมพลสจำกด h(n) วกรองอมพลสไมจำกด (Finite Impulse Response: FIR) (Infinite Impulse Response: IIR) h(n) … Centre of Electronic Systems and Digital Signal Processing 3
EEET 0770 Digital Filter Design �������� MATLAB code w = [0: 0. 01: pi]; % frequency points H = 0. 5+0. 5*exp(- i * w); subplot(2, 1, 1); plot(w, abs(H)) subplot(2, 1, 2); plot(w, angle(H)) เราได ตวกรองดจตอล แบบ วงจรกรองตำผาน (Low pass filter) dsp_7_1. eps Centre of Electronic Systems and Digital Signal Processing 6
EEET 0770 Digital Filter Design ��������� • FIR – Direct form – Cascade form – Linear-phase form – Frequency-sampling Centre of Electronic Systems and Digital Signal Processing • IIR – Direct form II – Cascade form – Parallel form 7
EEET 0770 Digital Filter Design FIR: Cascade Form (��� ) กรณ M=5 Centre of Electronic Systems and Digital Signal Processing 10
EEET 0770 Digital Filter Design 0123 45 การรวบเทอมชวยใหลดการคณลงไป Centre of Electronic Systems and Digital Signal Processing 50 % !! 12
EEET 0770 Digital Filter Design FIR: Linear-phase Form TYPE I (���� N= ������ ) . . . Centre of Electronic Systems and Digital Signal Processing 13
EEET 0770 Digital Filter Design FIR: Linear-phase Form TYPE II (���� N = ������ ) . . . Centre of Electronic Systems and Digital Signal Processing 14
EEET 0770 Digital Filter Design FIR: Frequency Sampling (1) เปนการสรางตวกรองโดยใช สมประสทธ จาก DFT Centre of Electronic Systems and Digital Signal Processing 15
EEET 0770 Digital Filter Design FIR: Frequency Sampling (2) เทยบเทากบ การ cascade ของ วงจรกรอง และตวกรองแบบหนงโพล จำนวน N ตว Centre of Electronic Systems and Digital Signal Processing 16
EEET 0770 Digital Filter Design FIR: Frequency Sampling (3) Centre of Electronic Systems and Digital Signal Processing 17
EEET 0770 Digital Filter Design IIR: Direct Form I Centre of Electronic Systems and Digital Signal Processing 19
EEET 0770 Digital Filter Design ������ “��� ”��� “���� ” สวน Centre of Electronic Systems and Digital Signal Processing เศษ 20
EEET 0770 Digital Filter Design IIR: Direct Form II Centre of Electronic Systems and Digital Signal Processing 21
EEET 0770 Digital Filter Design IIR: Cascade )��� ( Centre of Electronic Systems and Digital Signal Processing 23
EEET 0770 Digital Filter Design IIR: Parallel Form • ����������������� โดยท และ เปนเลขเชงซอน • ������� Partial Fraction Expansion ���� factor ��� Centre of Electronic Systems and Digital Signal Processing 24
EEET 0770 Digital Filter Design IIR: Parallel Form )��� ( กรณ N =4 ( Ns=2) Centre of Electronic Systems and Digital Signal Processing 25
EEET 0770 Digital Filter Design ������� FIR 1 จงหาผลตอบสนองความถ FI ของตวกรองดจตอลแบบ 0. 1เปนตวกรองทมโครงสรางแบบ Centre of Electronic Systems and Digital Signal Processing 0. 2 linear phase type II 26
EEET 0770 Digital Filter Design ������� FIR 1 หาสญญาณ ณ แตละ “node” 0. 1 - Centre of Electronic Systems and Digital Signal Processing 0. 2 27
EEET 0770 Digital Filter Design ������� FIR 1 รวมสญญาณ ท node 0. 1 - Centre of Electronic Systems and Digital Signal Processing 0. 2 28
EEET 0770 Digital Filter Design คณสญญาณ ������� FIR 1 0. 1 - Centre of Electronic Systems and Digital Signal Processing 0. 2 29
EEET 0770 Digital Filter Design ������� FIR 1 ได เอาทพทเมออนพทเปนอมพลส แปลงDTFT ซงทำใหได Centre of Electronic Systems and Digital Signal Processing ผลตอบสนองความถ 30
EEET 0770 Digital Filter Design ������� IIR 1 จาก ฟงกชนถายโอนขางลาง จงสรางตวกรองดจตอลในแบ direct form I และ direct form II หาผลคณของเทอมสวน Centre of Electronic Systems and Digital Signal Processing 31
EEET 0770 Digital Filter Design ������� IIR 1 Direct form I Centre of Electronic Systems and Digital Signal Processing 32
EEET 0770 Digital Filter Design ������� IIR 1 Direct form II Centre of Electronic Systems and Digital Signal Processing 33
EEET 0770 Digital Filter Design ������� IIR 2 จงหา ฟงกชนถายโอน Centre of Electronic Systems and Digital Signal Processing H(z) จาก โครงสราง direct form II ขางลางน 34
EEET 0770 Digital Filter Design Centre of Electronic Systems and Digital Signal Processing 35
EEET 0770 Digital Filter Design Centre of Electronic Systems and Digital Signal Processing 36
EEET 0770 Digital Filter Design ไดฟงกชนถายโอนเปน Centre of Electronic Systems and Digital Signal Processing 37
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