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Question
We have seen that the Hilbert transform introduces a 90° phase shift in the compo- nents of a signal and the transfer function of a quadrature filter can be written as e H(f) = {0 f >0 f =0. We can generalize this concept to a new transform that introduces a phase shift of 0 in the frequency components of a signal, by introducing e-je f > 0 f = 0 eje Hạ(f) = {0 f < 0 and denoting the result of this transform by xa(1), i.e., X4(f) = X(f)H9(f), where Xe(f) denotes the Fourier transform of xe (t). Throughout this problem, assume that the signal x (t) does not contain any DC components. 1. Find hø (1), the impulse response of the filter representing this transform. 2. Show that xe(t) is a linear combination of x(t) and its Hilbert transform. 3. Show that if x(t) is an energy-type signal, xe(t) will also be an energy-type signal and its energy content will be equal to the energy content of x(t).
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We have seen that the Hilbert transform introduces a 90° phase shift in the compo- nents of a signal and the transfer function of a quadrature filter can be written as e H(f) = {0 f >0 f =0. We can generalize this concept to a new transform that introduces a phase shift of 0 in the frequency components of a signal, by introducing e-je f > 0 f = 0 eje Hạ(f) = {0 f < 0 and denoting the result of this transform by xa(1), i.e., X4(f) = X(f)H9(f), where Xe(f) denotes the Fourier transform of xe (t). Throughout this problem, assume that the signal x (t) does not contain any DC components. 1. Find hø (1), the impulse response of the filter representing this transform. 2. Show that xe(t) is a linear combination of x(t) and its Hilbert transform. 3. Show that if x(t) is an energy-type signal, xe(t) will also be an energy-type signal and its energy content will be equal to the energy content of x(t).

Expert Answer

Hilbert transform analysis

According to the Hilbert transform, the transfer function of the quadrature filter is written as:

Electrical Engineering homework question answer, step 1, image 1

 

In terms of the frequency, the given transform is generalized as:

 

Electrical Engineering homework question answer, step 1, image 2

 

 

part 1

The impulse response of the filter representing the given transform is to be calculated.

The function Electrical Engineering homework question answer, step 2, image 1 can be written as:

Electrical Engineering homework question answer, step 2, image 2

 

The inverse Fourier transform of the above function is given as:

Electrical Engineering homework question answer, step 2, image 3

result

The value of the impulse response of the filter  comes out to be:

Electrical Engineering homework question answer, step 3, image 1

 

 

part 2

to show that the Electrical Engineering homework question answer, step 4, image 1 is the linear combination of the x(t) and its Hilbert transform.

if the given function is a linear combination of the x(t) , then it will be written in the form as:

Electrical Engineering homework question answer, step 4, image 2

the Fourier transform of the above equation gives.

Electrical Engineering homework question answer, step 4, image 3

Electrical Engineering homework question answer, step 4, image 4

 

from equations 1 and 2. the value of the constant b will be calculated as shown below.

Electrical Engineering homework question answer, step 4, image 5

 

 

 

 

calculation of the constants

the value of the constant b is calculated above, the value of the constant a is calculated by plugging the values of the constant b into any of the equation.

Electrical Engineering homework question answer, step 5, image 1

The expression is given as:

Electrical Engineering homework question answer, step 5, image 2

The given function is a linear combination.

part 3

Electrical Engineering homework question answer, step 6, image 1

the above can be solved using some results as shown below.

Electrical Engineering homework question answer, step 6, image 2

 

Final conclusion

the signals Electrical Engineering homework question answer, step 7, image 1 and the Electrical Engineering homework question answer, step 7, image 2 are the orthogonal signals.  therefore the equation of the energy reduces to the form as shown below:

Electrical Engineering homework question answer, step 7, image 3

 

 

result

the signal comes out to be an energy signal from the above calculation. also, the energy content of the signal comes out to be equal to x(t).



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