Example 3.3 Moving-average filter
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1 3.3 Difference Equa/ons for Discrete-Time Systems A Discrete-/me system can be modeled with difference equa3ons involving current, past, or future samples of input and output signals Example 3.3 Moving-average filter A length-n moving average filter is a simple system that produces an output equal to the arithme=c average of the most recent N samples of the input signal.
2 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.3 Moving-average filter
3 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.3 Moving-average filter
4 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.4 Length-2 moving-average filter
5 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.4 Length-2 moving-average filter
6 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.6 Exponen=al smoother
7 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.6 Exponen=al smoother
8 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.7 Loan payments Express the act of taking a bank loan an paying it back over =me as a discrete-=me system problem with monthly payments represen=ng the Input signal and monthly balance represen=ng the output signal. y[n] = (1+c)y[n-1] + x[n] c is the monthly interest rate
9 3.3 Difference Equa/ons for Discrete-Time Systems Example 3.7 Loan payments Express the act of taking a bank loan an paying it back over =me as a discrete-=me system problem with monthly payments represen=ng the Input signal and monthly balance represen=ng the output signal. y[n] = (1+c)y[n-1] + x[n] c is the monthly interest rate We can find out the monthly payment x[n] by solving the difference equa=on
10 3.4 Constant-Coefficient Linear Difference Equa/ons Constant-coefficient difference equa3on N a k y[n k] = b k x[n k] k=0 k=0 Ini/al condi/ons: y[n 0-1], y[n 0-2],. y[n 0 -N] It is typical, but not required, to have n 0 = 0. M
11 3.4 Constant-Coefficient Linear Difference Equa/ons Itera3vely solving difference equa3ons. Consider the difference equa=on for the exponen=al smoother of Ex.3.6 y[n] = (1- α)y[n-1] + α x[n] ² Given the ini=al value y[-1] of the output signal, y[0] is found by y[0] = (1- α)y[-1] + α x[0] ² Knowing y[0], the next output sample y[1] is found by y[1] = (1- α)y[0] + α x[1] ² Knowing y[1], the next output sample y[2] is found by y[2] = (1- α)y[1] + α x[2]
12 3.5 Solving Difference Equa/ons N a k y[n k] = b k x[n k] k=0 M k=0 Ini=al condi=ons: y[n 0 1], y[n 0 2],,.., y[n 0 N ] General solu=on: y[n] = y h [n]+ y p [n] ² y n ([n]: is the homogeneous solu=on of the differen=al equa=on natural response ² y p [n]: is the par3cular solu3on of the differen=al equa=on ² y[n] = y h [n] + y p [n] is the forced solu3on of the differen=al equa=on forced response
13 3.5 Solving Difference Equa/ons Example 3.11 Natural response of exponen=al smoother Determine the natural response of the exponen=al smoother defined as: y[n] = (1 α) y[n 1]+αx[n] If y[-1] = 2
14 3.5.1 Finding the natural response of a discrete- /me system General homogeneous differen=al equa=on: Characteris/c equa/on: N a k y[n k] = 0 k=0 a k z k = 0 k=0 To obtain the characteris=c equa=on, subs=tute: N y[n k] z k
15 3.5.1 Finding the natural response of a discrete- /me system Write the characteris=c equa=on in open form: a 0 + a 1 z a N 1 z N+1 + a N z N = 0 Mul=ply both sides by z N to obtain a 0 z N + a 1 z N a N 1 z 1 + a N = 0 In factored form: a 0 (a z 1 )(a z 2 )...(a z N ) = 0 Homogeneous solu=on (assuming roots are dis=nct): y h [n] = c 1 z 1 n + c 2 z 2 n c N z N n = N k=1 c k z k n Where unknown coefficients c 1, c 2,., c N are determined by the ini=al condi=on, the terms are called the modes of the system z i n
16 3.5.1 Finding the natural response of a discrete- /me system Example 3.12 Natural response of second-order system A second-order system is described by the difference equa=on: y[n] 5 6 y[n 1]+ 1 6 y[n 2] = 0 Determine the natural response of this system for n >= 0 subject to ini=al condi=on: y[-1] = 19, and y[-2] = 53
17 3.5.2 Finding the forced response of a discrete- /me system Choosing a par3cular solu3on for various discrete-=me input signals The coefficient of the par3cular solu3on are determined from the Difference equa=on by assuming all ini=al condi=ons are equal to zero.
18 3.5.2 Finding the forced response of a discrete- /me system Write the homogeneous difference equa=on Solve homogeneous difference equa=on with undetermined coefficient Find the form of the par=cular solu=on Find the coefficients of the par=cular solu=on Add the homogeneous and par=cular solu=on Together to obtain the total solu=on
19 3.5.2 Finding the forced response of a discrete- /me system Example 3.14 Forced response of exponen=al smoother Determine the forced response of the exponen=al smoother defined as: y[n] = (1 α) y[n 1]+αx[n] The input signal is a unit-step func=on, and y[-1] = 2.5
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