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please give me the code for those question

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MD NASIM
MD NASIM 2018-7-12
关闭： Steven Lord 2023-10-15
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Yettapu Vishnu
Yettapu Vishnu 2020-8-28
  1. speech signal X(t) for less than 5 seconds. Using MATLAB,
a. Plot the signal X(t). Record
b. Pass the signal through a differentiator and plot the output signal Y(t).
c. Plot the power spectral density SY(f).
need code for this question a,b,c

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回答（3 个）

Florian Floh
Florian Floh 2018-7-13
Hello MD NASIM! As already mentioned, you can learn programming the fastest way, if you try it yourself (copying pieces of code does not get you anywhere. Make sure, you understand what you are coding!). However, if you have any difficulties, let me give you a place to start. The "spherical helix" would be done in this way: (now try to figure out the code for the other figures by yourself!)
% Set up the variable c
c = 5;
% make a vector ranging from 0 to 10*pi, separated into 100 equal pieces
phi = linspace(0,10*pi,100);
% Compute the coordinates (.* is the Hadamard product (elementwise multiplication))
x = sin(phi/(2*c)).*cos(phi);
y = sin(phi/(2*c)).*sin(phi);
z = cos(phi/(2*c));
% plot your results:
plot3(x,y,z);
If you want to know any further details of a Matlab function (i.e. 'plot') then type "doc plot" into your "Command Window".
Kind regards, Florian
Ravi
Ravi 2023-10-15
Simulate the diffraction gain. From the given geometry use the assigned values to compute the diffraction gain and compute the received signal power under diffraction which is P diff r (d) = Gd (ν) P LoS r (d). Here P LoS r (d) denotes received power under Line-of-Sight Condition.
Ravi
Ravi 2023-10-15
Compute the gain of antenna at the base station using the aperture value specified in the excel sheet. For free space propagation model, assume the gain of the receiver antenna as 1. The Tx-Rx separation distance range is df to 10000 × df , where df is the far-field distance of base station antenna. For two-ray ground reflection model set the distance as dT to 10000 ∗ dT , where dT = 20hthr λ .

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