2 Discretetime Signals and Systems CESd SP EEET
- Slides: 102
2 Discrete-time Signals and Systems ���������� รศ. ดร. พระพล ยวภษตานนท ภาควชา วศวกรรมอเลกทรอนกส CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. 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 Assoc. 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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -4
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Sampling • การชกตวอยางสญญาณ x(t) จะได x(n) สมดวยควา มถ = t . . . • ผลลพทคอ CESd. SP x(n): EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -6
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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -7
Elements of the Sampling Signal • S(n) นนประกอบจากอมพลสตางการเลอน + + n s(n) n = n T n + CESd. SP T 2 T 3 T n EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -8
An Impulse is Delta Function • อมพลส คอ เดลตาฟงกชน โดย ใหคา “ 1” เมอ n=0 และ ใหคา “ 0” เมอ n เปนคาอนๆ 1���� 0 n • เขยนเปน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -9
Shifted Delta Function • อมพลสนำมารวมกนไดเปน ไดจากการเลอนคา s(n) �������������� 1 n 0 ��������������� 1 0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon 1 n DSP 2 -10
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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -11
Sampling Signals= Summing of Delta function • สญญาณทเปนสญญาณสมนนประกอบด วย เดลตาฟงกชนทมคาการเลอนแตกตาง กน • หรอ เขยนใหมเปน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -12
Discrete-time Signal x(n) • x(n) สรางจาก ผลคณของ x(t) และ s(n) เมอ t=k. T t CESd. SP … = n EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon n DSP 2 -13
DSP System Block Diagram • ระบบ DSP ทงายทสด A/D CESd. SP แสดงดงขางลาง DSP Processor EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon D/A DSP 2 -14
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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -15
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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -16
Example 2. 1: 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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -18
Example 2. 1: System 2 ����������� n=0 ���� �� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -19
Example 2. 1: System 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -20
Example 2. 1 : System 4 • • Accumulator CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -21
���������� � (Linear Shift-invariant (LSI) Systems) • เชงเสน (Linear) หมายถง ถา ระบบ T[ ] ใหผลลพธเปน • เมอเปลยนอนพทเปนดงรป CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -22
Example 2. 2 : Linear I • จงหาวาระบบขางลางน ระบบใดเปนหรอไมเปนเชงเสน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -23
Example 2. 2: Linear 2 ������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -24
Example 2. 2: Linear 3 ������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -25
Example 2. 2: Linear 4 ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -26
Example 2. 2: Linear 5 ������ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -27
Example 2. 2: Linear 6 ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -28
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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -29
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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -30
Example 2. 3: Shift-Invariant 1 • จงหาวาระบบใดเปน CESd. SP Shift-invariant EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -31
Example 2. 3: Shift-Invariant 2 • ������ y(n) ����� x(n) �� k ������� Shift-invariant CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -32
Example 2. 3: 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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -33
Example 2. 3: 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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -34
Example 2. 3: 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 Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -35
������ Difference Equation • หรอ สมการผลตางแบบคาสมประสทธคงท Linear Constant–Coefficient Difference Equation (LCCDE( • สมการของระบบจะเขยนในรปทวไปของสมการผ ลตาง CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -36
��������� Recursive Difference Equation • คอ การ “วน” เอาทพท CESd. SP y(n-l) มาคำนวณ y(n( EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -37
���������� Nonrecursive Difference Equation CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -38
Example 2. 4 (��� ( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -40
Example 2. 5 • จงคำนวณสมการความแตกตางของระบบการคำนว ณมมการเคลอนทของดาวเทยมเปน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -41
Example 2. 5 (��� ( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -42
�������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -43
n=0, n=1 • n=0 • n=1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -44
n=2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -45
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -46
• ให y(-1) =0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -47
��� bm �������� (Impulse Response) h(n) ������ • แทนคา CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -48
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -49
�������� FIR • โดยทวไปเราเขยนระบบ FIR ในรปของผลตอบสนองอมพลส Response ) ไดดงขางลางน CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon (Impulse DSP 2 -50
����� (Convolution( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -51
���� Discrete-time Signal x(n) • x(n) สรางจาก ผลคณของ x(t) และ s(n) เมอ t=k. T t CESd. SP … = n EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon n DSP 2 -52
• จาก • เขยนใหมเปน • หรอ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -53
• x(t) ทจะคณกบแตละเทอมไดนน ตองเปนตำแหนง t=k. T หรอ • เอาเขาไปคณในวงเลบ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -54
��� sampling ��������� • การ sampling CESd. SP • การประสาน (Convolution) EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -56
������� x(n) ���� Delta function ������ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -57
������ x(n)���� Delta function CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -58
����� x(n) �� 10 ������ • สำหรบสญญาณ • จะได CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -59
X(t) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -60
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��������� 1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -62
��������� 1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -63
������ 1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -64
��������� 2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -65
��������� 2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -66
������ 2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -67
����� Delta function �������� • สำหรบระบบทเปน CESd. SP เดลตา ฟงกชน สมดวยควา มถ = ระบบ EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -68
��������� 2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -69
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -70
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -71
Sampled Signal 0 12 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon n n DSP 2 -72
System with Delayed Delta function • สำหรบระบบทเปน ทมการหนวงเวลา CESd. SP เดลตา ฟงกชน สมดวยควา มถ = ระบบ EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -73
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -74
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -75
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -76
Delayed Signal 0 12 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon n n DSP 2 -77
����� Convolution (revisited) • จาก • สงเกตวา ดชน k เปน คาลบ ซงหมายถง การกลบดาน (folding) ของลำดบ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -78
������ (Folding) ��� Delta function ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -79
������ (Folding) ������� (Shifting) ��� Delta function CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -80
������ (Folding) ��� x(n( • สมมตวาม ���� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -81
������ (Folding) ������� (Shifting)��� x(n ( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -82
Convolved Signal 0 12 3 + 0 12 3 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -84
Example Convolution • ตวอยางการประสาน • คำนวณผลการประสานเมอ CESd. SP n=-1 ถง 3 EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -85
• จดเรมตนท • • • n= -1 ดจาก คำนวณ y(n) n = -1 n=0 n=1 n=2 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -86
n = -1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -87
n =0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -88
����� y(n) dsp_2_4 �������� y(n) ���� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -89
����� convolution ������ N=0 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -90
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -91
��������� • Cumulative Property • Associative property • Distributive property • CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -92
�������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -93
��������� (Unit Step Sequence( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -94
• เราเขยน u(n) เปน • หรอ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -95
��������� u(n( CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -96
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -97
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -98
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -99
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -100
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -101
����� Ch. 2 (Proakis) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Assoc. Prof. Dr. P. Yuvapoositanon DSP 2 -102
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