# Questions tagged [homework]

Homework means the asker is requesting help with school homework. This lets potential answerers know that they should guide the student in solving the problem, rather than simply showing the complete answer.

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### Fourier Transform of shifted Impulse

I'm new here and I hope you can help me. I started studying the Fourier Transform now at University and I have a lot of doubts about this subject. My teacher sent to us one list of exercises and I don'...
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### Poles and Zeroes - Z Domain

2nd order Butterworth transfer function: $$H(z) = \frac{ 0.0201z^2 + 0.0402z + 0.0201 } { z^2 - 1.5609z + 0.6413 }$$ I'm a bit uncertain about the factorization at the denominator. Here's what I ...
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### $\mathcal Z$-transform of an equation [Exam question]: Verifying the solution

I'm studying for exams at the moment and I'm trying to reproduce a solution from my professor (I have the solutions). The following signal is given: The excercise says: Calculate the Fourier ...
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### Simplification after sampling an analog signal [closed]

$80\textrm{ Hz}$ Sampling rate produces the $x[n] = 3\cos(5\pi n/4)$ signal, the original analog signal is $x(t) = 3\ cos(100\ π t)$. This is a solved problem used as an example. In the solution ...
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### Signal generation: random noise

I have attempted question 1 a) below in MATLAB 6.5, but I need my answer to be checked. How do I do question 1 b) below ? What does it mean to have a zero mean? Generate the following signals ...
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I'm trying to solve this signals homework problem: So for part a, since multiplication in the time domain is convolution in the frequency domain, I just used a DTFT table, found the DTFT for $\left(\... 1answer 460 views ### Solving for frequency deviation,$\Delta f $(FM modulation) I'm sorry if I posted this in the wrong section. I solved the question and got$50\textrm{kHz}$, but the solution says it is$100\textrm{kHz}$without any proof. Im asking for someone to tell me ... 1answer 373 views ### Demodulating upper sideband (USB) signals A modulating signal$m(t)= \sin(2 \pi \nu_m t)$is transmitted via a carrier of frequency$\nu_c$using upper sideband (USB) modulation. Show that the USB modulated signal can be demodulated using a ... 0answers 378 views ### Implementing blind deconvolution in MATLAB I want to implement blind deconvolution for the signal$ r(n) = h(n) \star s(n) + a(n)$in MATLAB where$r(n)$is the recorded speech$h(n)$is impulse response of room acoustics$s(n)$is desired ... 1answer 436 views ### How to do this root locus by hand? I have an open-loop system function $$L(s)=6\frac{(s-2)^2}{s(s-20)^2}$$ and I wanted to to the root locus diagram for it. I did it in MATLAB and got the following graph What I don't know how to do ... 2answers 165 views ### Impulse response of a continuous time system Question The impulse response of a continuous time system is$h(t) = e^{-t}u(t)$. When$x(t) = u(t - 1)$is input to this system what is the value of the output signal$y(t)$at$t = 2.34$. My ... 1answer 219 views ### Signal equation using signal waveform and Fourier series? Part A: Obtain signal waveform from mathematical equation of the signal Let a sinusoidal periodical signal is represented by an equation$$y=f(t)=10+10\cos\left(\frac{2\pi f_1t}{T} +\frac{\pi}{6}\... 1answer 177 views ### Response of cascading FIR filters I can't seem to get the right answer for this. Could someone show me the procedure? As shown in the figure a system is constructed by cascading four FIR filters having the following frequency ... 1answer 192 views ### How to calculate transmission capacity? My textbook doesn't explain how they got the answer to this question: "If a transmission channel uses an analog carrier wave that is modulated by eight amplitudes and sixteen frequencies per bit ... 1answer 153 views ### Are these Linear and Time Invariant Systems? We were given the above systems and we were asked to tell whether they are linear (or not) and time invariant(or not).$y(m,n)=x(m,n)+c,\quad c>0 y(m,n)=x(m,n)+x(m,-n)y(m,n)=x(m,n+m)y(m,n)...
I am having difficulty with this question specifically with the $\sin()$ part. So here goes nothing: Consider a Linear Time-Invariant system with input $x[n]$ and output $y[n]$. When the input to the ...