2 Discretetime Signals and Systems CESd SP EEET
- Slides: 82
2 Discrete-time Signals and Systems ���������� ผศ. ดร. พระพล ยวภษตานนท ภาควชา วศวกรรมอเลกทรอนกส CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -1
Continuous v. s. Discrete-time Signals CESd. SP ����� DSP ������� Signals and Systems ��� DSP ������������ DSP 2 -3 ������ EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon
Discrete-Time Continuous Amplitude • ในคอรสน เราสนใจเฉพาะสญญาณทเปน Discrete-Time, Continuous Amplitude เทานน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -4
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Discrete-Time Signal from A/D Converter • ในทางปฏบตเราไดสญญาณ จาก A/D Converter Discrete-time A/D ������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon ����� DSP 2 -6
DSP System Block Diagram A/D CESd. SP DSP Processor EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon D/A DSP 2 -7
Sampling • การสมสญญาณ x(t) เพอทำใหไดสญญาณสมดวยควา มถ = x(n) t . . . • ผลลพทคอ CESd. SP x(n): EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -8
Combination of Sampling • สญญาณ x(n) = สญญาณสม สญญาณ “x(t)” “s(n)” คณ t n n T • S(n) ประกอบจากสวนยอย CESd. SP คอ อมพลส EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -9
Elements of the Sampling Signal • S(n) นนประกอบจากสวนยอยๆ + + อมพลส n s(n) n = n T n + CESd. SP T 2 T 3 T n EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -10
An Impulse is Delta Function • อมพลส คอ เดลตาฟงกชน ใหคา “ 1” เมอ n=0 • และ ใหคา “ 0” เมอ 1 n เปนคาอนๆ ���� 0 n • เขยนเปน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -11
Shifted Delta Function • อมพลสนำมารวมกนไดเปน ไดจากการเลอนคา s(n) �������������� 1 n 0 ��������������� 1 0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon 1 n DSP 2 -12
Summing of Shifted Delta Function + + + 0 T 2 T 3 T CESd. SP n + n n = + + n n EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -13
Sampling Signals= Summing of Delta function • สญญาณทเปนสญญาณสมนนประกอบด วย เดลตาฟงกชนทมคาการเลอนแตกตาง กน • หรอ เขยนใหมเปน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -14
Discrete-time Signal x(n) • x(n) สรางจาก ผลคณของ x(t) และ s(n) เมอ t=n. T t CESd. SP … = n EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon n DSP 2 -15
DSP System Block Diagram • ระบบ DSP ทงายทสด A/D CESd. SP แสดงดงขางลาง DSP Processor EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon D/A DSP 2 -16
A/D Part in DSP • สวน A/D DSP Processor Hold D/A Quantizer Sample and Hold CESd. SP A/D Converter EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -17
A/D Converter • ระบบ DSP มสวนประกอบ Hold Quantizer A/D Converter DSP Processor D/A Sample and Hold A/D Converter CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -18
��������� Digital Signal Processor A/D DSP D/A ������������ DSP CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -19
��������� SUN �������� ������ Solar Cell Panel CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -21
Example: System 1 • Example 2. 2. 1 from Proakis’s Text • จงหา y(n) ในกรณ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -22
Example: System 2 ����������� n=0 ���� �� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -23
Example: System 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -24
Example: System 4 • • Accumulator CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -25
���������� � (Linear Shift-invariant (LSI) Systems) • เชงเสน (Linear) หมายถง ถา ระบบ T[ ] ใหผลลพธเปน • เมอเปลยนอนพทเปนดงรป CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -26
Example: Linear I • Example 2. 2. 5 จงหาวาระบบขางลางน ระบบใดเปนหรอไมเปนเชงเสน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -27
Example: Linear 2 ������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -28
Example: Linear 3 ������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -29
Example: Linear 4 ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -30
Example: Linear 5 ������ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -31
Example: Linear 6 ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -32
Shift-invariant 1 • ไมแปรตามการเลอน (Shift-invariant) หมายถง หาก y(n) เปนผลตอบจาก x(n) ������� k �� y(n) ���� y(n, k) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -33
Shift-invariant 2 • ลองเลอน y(n) ไป k จะได y(n-k) และหาก • �������� (Shift-invariant) • ������������ (Shift-varying) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -34
Example: Shift-Invariant 1 • Example 2. 2. 4 จงหาวาระบบใดเปน invariant CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon Shift- DSP 2 -35
Example: Shift-Invariant 2 • ������ y(n) ����� x(n) �� k ������� Shift-invariant CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -36
Example: Shift-Invariant 3 ������� n �� x(n) ������� • เมอเลอน แซมเปล y(n) ทไดจาก x(n) ไป k Shift-varying CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -37
Example: Shift-Invariant 4 • เมอเลอน แซมเปล y(n) ทไดจาก x(n) ไป k Shift-varying CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -38
Example: Shift-Invariant 5 • เมอเลอน แซมเปล y(n) ทไดจาก x(n) ไป k Shift-varying CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -39
������ Difference Equation • สมการของระบบจะเขยนในรปทวไปของสมการผ ลตาง CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -40
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n=0, n=1 • n=0 • n=1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -42
n=2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -43
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -44
• ให y(-1) =0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -45
• แทนคา CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -46
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -47
����� (Convolution( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -48
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -49
FIR • หากระบบมเพยง • แตโดยทวไปเราเขยนระบบในรปของผลตอบสน องอมพลส (Impulse Response ( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -50
����� (Convolution( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -51
����� Convolution (revisited) • จาก • สงเกตวา ดชน k เปนคาลบ ซงหมายถงการกลบดาน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -52
������� ���������� x(n) ����� =0 ��� 1 ���������� ��� h(0) + ��� h(1) ���� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -53
������� (Convolution) ���������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -54
System with Delta function • สำหรบระบบทเปน CESd. SP เดลตา ฟงกชน สมดวยควา มถ = ระบบ EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -55
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -56
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -57
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -58
Sampled Signal 0 12 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon n n DSP 2 -59
System with Delayed Delta function • สำหรบระบบทเปน ทมการหนวงเวลา CESd. SP เดลตา ฟงกชน สมดวยควา มถ = ระบบ EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -60
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -61
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -62
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -63
Delayed Signal 0 12 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon n n DSP 2 -64
Convolved Signal 0 12 3 + 0 12 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -66
�������� = CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -68
Example Convolution • ตวอยางการประสาน • คำนวณผลการประสานเมอ CESd. SP n=-1 ถง 3 EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -69
• จดเรมตนท • • • n= -1 ดจาก x(n) คำนวณ y(n) n = -1 n=0 n=1 n=2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -70
n = -1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -71
n =0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -72
����� y(n) dsp_2_4 �������� y(n) ���� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -73
����� convolution ������� N=0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -74
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -75
��������� • Cumulative Property • Associative property • Distributive property • CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -76
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -77
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -78
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -79
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -80
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -81
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 2 -82
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