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BlackZzzverrR [31]
3 years ago
15

H is a discrete-time LTI system with impulse response h[n] = δ[n] − 2δ[n − 1] + 3δ[n − 2]. Find the output signal y[n] in terms

of the input signal x[n] (use the convolution equation and the properties of convolution with deltas). Hint: since the input signal x[n] is unknown, your answer should express the output signal y[n] as a linear combination of the shifts of x[n].
Mathematics
1 answer:
n200080 [17]3 years ago
4 0

Answer:

The output is given as y(n)=x[n]-2x[n-1]+3x[n-2]

Step-by-step explanation:

As the output is given as y(n) and the input is given as x(n) thus the

equation of the output is given as

y(n)=h(n)*x(n)

Here the impulse response h(n) is given as

h(n)=\delta[n]-2\delta[n-1]+3\delta[n-2]

So the output is given as

y(n)=h(n)*x(n)\\y(n)=(\delta[n]-2\delta[n-1]+3\delta[n-2])*x(n)

By distributive property,(ax1[n] + bx2[n]) * h[n] = ax1[n] * h[n] + bx2[n] * h[n]

y(n)=h(n)*x(n)\\y(n)=\delta[n]*x(n)-2\delta[n-1]*x(n)+3\delta[n-2]*x(n)

Now by the convolution properties with delta \delta[n- k] *x[n] = x[n-k]

so

y(n)=\delta[n]*x(n)-2\delta[n-1]*x(n)+3\delta[n-2]*x(n)\\y(n)=\delta[n-0]*x(n)-2\delta[n-1]*x(n)+3\delta[n-2]*x(n)\\y(n)=x[n]-2x[n-1]+3x[n-2]

So the output is given as y(n)=x[n]-2x[n-1]+3x[n-2]

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<h2><u>Sol</u><u>ution</u><u>:</u></h2>

Equation: x² + 10x + 21

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<u>Step</u><u> </u><u>2</u><u>:</u> Get the new equation bracketed → (x² + 7x) (+3x + 21)

<u>Step</u><u> </u><u>3</u><u>:</u> Use 'x' in the equation. For the first part, we have 'x'. x² = x × x so, bring out one x out side the bracket, divide 7x by = 7 → x (x +7). Do the same for the second part by dividing 21 by 3 = 7, and then bringing out 3 from the bracket → 3 (x + 7).

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(x+3) (x+7)

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