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.
46
questions with no upvoted or accepted answers
3
votes
0answers
59 views
Solving the PDE of a signal in an optical fiber
Disclaimer Please let me know if this is not the right place to ask this question.
Disclaimer Part 2 I have no background in signals. My focus is in mathematics.
In my programming class, we are ...
3
votes
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 ...
3
votes
0answers
1k views
How do I check controllability and observability using Gramian matrixes?
I have a pending exam and this is one of the must-know questions. It will be about checking controllability/observability of a simple MIMO linear system, using Controlability Gramian/Observability ...
3
votes
0answers
107 views
Finding the output for an input sequence
So I think I have the answer I just want to make sure I'm doing things correctly.
Let a be in the open unit disk, $F_s > 0$, and $0<f_0 < \frac{F_s}{2}$. Let $h[n]=0$ for $n < 0$ and $h[...
2
votes
3answers
108 views
Inverse z-transform. Where is mistake?
I've already wrote about that trouble (link here), but I don't understand where I've made a mistake.
Full description of the task is as follows:
Z-transform of sequence {x(k)} describe by the ...
2
votes
1answer
195 views
Convolution of Input signal and Impulse response
I can solve the output if the input is
$$ x[n] = \delta[n+1] + \delta[n] + 2\delta[n-1] + \delta[n-2]$$
and the impulse response is
$$ h[n]= 3\delta[n] − 2 \delta[n−1] − \delta[n−2] + \delta[n−3]$...
2
votes
0answers
4k views
Adaptive Delta Modulation For Speech Signals
I need to implement an adaptive delta modulation encoder and decoder using matlab for my term project. How can I code a good adaptive delta modulation? How can I change ...
2
votes
0answers
765 views
Determine line rate and frame rate of a system
I have as a homework to determine the line rate and frame rate for a system described above:
...
2
votes
0answers
292 views
Proving a cyclostationary processes signal
Suppose a random signal $x(t)=\sum\limits_{n=-\infty}^\infty Z_n \delta(t-n\tau)$, where $ z_n = Z$ and $Z$ is a random variable with equal probability to be $+-1$, is passing through a low pass ...
1
vote
1answer
143 views
Extract approximation and detail coefficients
I am a student and would like to know how to extract the approximation and detail coefficients (A5, D5, D4, D3, D2 and D1) after an applied DWT decomposition dB5 (Daubechies 5, level = 5)?
1
vote
0answers
49 views
How to calculate the magnitude of rounding error in N-bit signed fixed-point arithmetic?
In example take into consideration 11-bit <11,5> signed fixed-point arithmetic.
000000.11111 - 0.96875
000001.00000 - 1
so the error magnitude will ...
1
vote
1answer
88 views
Block diagram of filter
Can you help me with this question. Can you explain where i should start to solve the problem.
1
vote
2answers
157 views
Problem identifying the analytic expression of such determined signal
I came across this problem
I am supposed to find the Fourier transform of $g(t)$, but I am not able to find the analytical expression of such signal.
The teacher suggests that I should consider ...
1
vote
0answers
198 views
MATLAB implementation Spline Fitting
Let $s(t)$ be a signal that can be approximated by a uniform spline
function of order $K$ (say $K=2$): $$s(t)\approx\sum_{n\in \mathbb{Z}}c_n\beta_+^{(K)}(t-n) $$
Suppose that we know the ...
1
vote
0answers
147 views
Multiply filter kernel by sine
1)Suppose that we have low-pass filter with cf equal to 0.1. How frequency response would look like if I multiply filter kernel by sine with frequency say 0.3? How this is related to converting
low-...
1
vote
0answers
78 views
Image Compression (JPEG) - Show the Effect of Number of Coefficients on Quality
write an m-file that will take the"cameraman" and produce a image quality or difference matrix for spectral selection method.The image properties are a sfollowings:
For spectral selection:
image1:DC ...
1
vote
0answers
430 views
GLOBAL THRESHOLDING using histogram
There is a recursive way of finding threshold in the image using histogram that are biomodal, and is as follows:
An automated procedure for bimodal histograms :
Select an initial estimate of T
...
1
vote
0answers
69 views
Find another cosine y(t), whose frequency is as close as possible to that of x(t),
I am going to be straight forward and say this is one of the problem sheets and I am stuck on one of the questions. I already know the answer as I have been given them but I am trying to work ...
1
vote
0answers
5k views
The Fourier Series, Amplitude and Phase Plot of a Saw Tooth Waveform
I am trying to find the amplitude and phase plots of the saw tooth waveform pictured.I have already computed the Fourier series of the waveform but I don't know how to derive the amplitude and phase ...
1
vote
0answers
2k views
Filtering voice signal from randomly added frequencies
I have this assignment that I can't figure how to solve.
I have a sound.wav human-voice file, and use matlab add-random-noise (monotonic)
Goal: to remove the noise from the sound (and the sound from ...
1
vote
0answers
979 views
Calculate total bit rate
I want to calculate the total bit rate of a video system.
In order to calculate the total bit rate for a 1080/50p video system(4:2:2) we need:
...
1
vote
0answers
816 views
Local histogram equalization
I want to learn computer vision and so I downloaded image processing slides from my university archive. I'm on histogram equalization. Learning about local histogram equalization points me out to this ...
1
vote
0answers
107 views
The transmitted signal of DPSK
I am very confused about how to get the transmit sequence of the DPSK signal.
In my lecture notes, teacher give as the following example.
...
1
vote
1answer
183 views
Periodicity of signals
$$x(t) = \cos(2 \pi t) \cdot u(t)$$
$$y(t) = x(t) + x(-t)$$Is $y(t)$ periodic. If so, what is the $T$?
$$x(t) = \sin(2 \pi t) \cdot u(t)$$
$$y(t)= x(t) + x(-t)$$
Is $y(t)$ periodic?
0
votes
0answers
29 views
Signal to Quantization noise problem
a full scale signal of bandwidth 5 khz is sampled by an 10-bit ADC at a sampling rate of 2 Msa/sec
calculate the Signal to Quantization noise of the resulting DT signal
repeat for a 14-bit ADC at ...
0
votes
1answer
65 views
0
votes
0answers
53 views
Calculating output of a digital system signal with a filter that introduces delay
We have a step function at the entrance that goes through the following system. The $D(z)$ digital filter introduces a 0.25s delay. Output as $y(kT)$ must be calculated. How can we tackle this problem?...
0
votes
0answers
31 views
Calculating the number of MACs in a system
I want to calculate the number of MACs. I am looking for the method.
How would I do it if I know the domain equations from a biquadratic digital filter. I have already calculated the Z domain ...
0
votes
0answers
35 views
FIR Kaiser Window Discrete Time Filter Design
Please look at Part (c) of the question. How do we know that the Filter is a Low-pass or High-pass and is the filter designed in C a multi-band-pass filter.
0
votes
0answers
62 views
OFDM system with cyclic prefix
I have:
Bit rate $ R_b = 25.6 [Mbit/s]$
Sampling frequency at the input of the receiver: $ f_p = 8 [MHz]$
Protective spacing between successive OFDM symbols: $ τ = 16 [µs] $
The combined length of ...
0
votes
0answers
62 views
OFDM modulator: Transmission time calculation
I have a problem with a certain task.
The frequency of the signal sampling at the OFDM modulator output is
20 MHz. The length of the protection period is 2 microseconds and it is
20% of the ...
0
votes
0answers
31 views
Synthesizing a function from a fourier transform
So I have this question in a homework and cannot seem to solve it no matter what I try.
Question:
Use Matlab to find out what function in time x(t) resulted in the Fourier Series ...
0
votes
1answer
75 views
How do I know what is causing the noise in my signal
I have a noisy audio file, available here (It is safe to download if you wish to)
https://ufile.io/pstrt
Now, I inspect it in matlab:
And then i plot it on normalised frequency:
Now I need to ...
0
votes
0answers
254 views
Finding the Period of a Signal by Its DTFT Data
find period of DTFTs where vertical lines represent Dirac deltas
0
votes
1answer
53 views
Meaning of a formula about transient frequency bins
I'm trying to understand the following formula in this paper:
Sadly, the paper does not define most of the symbols it is using, so my guesses so far are:
$T_{tr}$ refers to the sampling interval
i....
0
votes
1answer
986 views
Ratio of the power in the sidebands to the total power in conventional AM
Message signal and carrier signal are given as
$m=\cos(2 \pi \cdot f_{m} \cdot t) $
$c=A_{c}\cdot \cos(2 \pi \cdot f_{c} \cdot t) $
I was asked to find modulation index $a$ so that ratio of the ...
0
votes
1answer
294 views
Pole zero plot, normalizing frequency response plot?
I'm asked to plot the frequency response (amplitude) given a specific pole-zero diagram.
$$ H(z) = H_0 \frac{\prod\limits_{m=1}^{M} (z - q_m)}{\prod\limits_{m=1}^{M} (z - p_m)}$$
$$ H(e^{i\omega}) =...
0
votes
0answers
176 views
Equation for impulse train
I am looking for a formula (Fourier series) to generate an impulse train waveform - a spike-wave with amplitude and period both $1$ – so that $f(x)$ has value $1$ at $x = 1,2,3,4...$ and $f(x)$ has ...
0
votes
2answers
389 views
Filtering of complex exponential functions
In my problem the signals $x(t), h(t), w(t), y(t)$ and $y_w(t)$ are defined as follows:
\begin{align}
x(t)&=\sum_{i=1}^M a_i\delta(t-\tau_i) \\
h(t)&=e^t\exp\left(-e^t\right) \\
w(t)&=\...
0
votes
0answers
846 views
What are the frequency components of a sampled signal after low-pass filtering?
A continuous signal $x_a(t)$ is a linear combination of sinusoids of frequency 250 Hz, 450 Hz, 1 kHz, 2.75 kHz and 4.05 kHz. The signal $x_a(t)$ is sampled at $f_s=$1.5 kHz, and the resulting digital ...
0
votes
0answers
18 views
Simulating rain interference
What fading model should I use for simulating rain loss in my network simulations? I am using NS-3 for this and I'm quite lost on how to go about this.
My simulation is just simple packet streaming ...
0
votes
0answers
315 views
How is it possible to find the Fourier transform of unit impulse function?
Since Fourier transforms are applicable to only periodic functions, and unit impulse function{..0,0,1,0,0..} doesn't seem periodic, is this possible?
Is it like we are considering unit impulse ...
0
votes
0answers
116 views
a static AWGN channel
Consider a static AWGN channel
$$
Y = hX+N
$$
where $h$ is a constant channel gain and the noise $N(0,N_1)$ is independent of the input $X$. The input is from a 2-PAM constellation, i.e., $X \in \ \...
0
votes
0answers
253 views
calculate frequency at -6 db
I have to do an exercise. Given this signal: $H(f)=\frac{\frac{T}{2}}{1+(\pi f\frac{T}{2})^2}$ calculate the frequency at $-6 db$. How can I resolve this exercise? I tried this: $\frac{\frac{T}{2}}{1+...
-2
votes
1answer
89 views
Fourier Coefficients
Consider the signal
$$x(t)=\cos(2\pi t)$$
Since $x(t)$ is periodic with a fundamental period of $1$, it is also periodic with a period of $N$, where $N$ is any positive integer.
What are the ...
-2
votes
1answer
270 views
Finite moving average filter
I am trying to solve this problem but I need a lot of help. Below are my answers for the separate parts, please check and tell me where I am wrong because I am weak on the fundamental concepts of this....
