Community Profile # Mohamad

Last seen: 4 months ago Active since 2018

Electrical Engineering

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Answered
PLOTTING TWO CYCLES SINE WAVE
Hi , sorry for being late as I jsut saw the reply , run the code , accept the answer , thanks %% generate and plot 2 sin(wt) ...

4 months ago | 1

Answered
Plot a rectangular Pulse from -1 to 1
This just an example , you have to repeat according to your code requirements : prompt = 'Enter the vector t1 '; t1 = input(pr...

6 months ago | 1

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How can I define proper frequency domain of FFT function in Matlab
Hi , I correct the code , check clear clc close all lambda_o=1e-6; % 1[um] of wavelength c=3e8; % speed of l...

7 months ago | 0

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*Matrix dimensions must agree error*
Hi , I made the required corrections in the code , now it is working , I also plot y1 and y3 . %============================== ...

7 months ago | 0

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Changing to DB in frequency spectrum from power
db=10*log10((fft_nokia.*conj(fft_nokia))/n);

7 months ago | 0

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Diode i-v Curve Graph
Try this , change voltage vaues as you need . clc clear all n = 1.65; %Ideality factor Is = 220*10^-12; % diode reverse ...

7 months ago | 0

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Linear Equations Solving Problem
Hi , you can use the Pseudoinverse of matrix H , because it is not a sqaure matrix . x=pinv(H)*U

8 months ago | 0

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How do I resolve the error "Matrix dimensions must agree" here?
Hi , follow this correction , now you get the row_vector matrix with size ( 13 x 4 ) row_vector=a_mat*C_new ;

8 months ago | 0

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PLOTTING TWO CYCLES SINE WAVE
f0=1000 ; % sinusoid frequency in Hz fs=50*f0; % sampling frequency dt=1/fs; % sampling interval duration=0.01 ; % dur...

8 months ago | 0

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Question

Adding noise to a signal and which caculation of Signal to Noise Ratio is correct ?
Hi , Please I need to add white gaussain noise with a variance = (4/9)*var(sig) to the signal in ( noise_test.mat) . I need to ...

8 months ago | 0 answers | 0

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Sum sound signals with different size
y_dot=[y_dot zeros(1,length(y_dash)-length(y_dot))];% pad zeros y_code_space=[y_code_space zeros(1,length(y_dash)-length(y_cod...

8 months ago | 0

Question

Time vector to generate a sinusoid signal with 0.5 seconds duration , Fs =200
Hi , please I'm confused with the following time vectors t1 and t2 to generate 0.5 second duration sinusoid signal : Vector...

8 months ago | 1 answer | 0

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Question

Why I can not use ( -Inf , Inf) in the Limits of Integral for Inverse Fourier transform of X(w) = 1/(1+j*w) ?
% Compute Inverse Fourier transform of X(w)=1/(1+j*w) Hi , Please I need to peform Inverse Fourier Transform for X(w)=1/(1+j*w)...

8 months ago | 0 answers | 0

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Question

voiced / unvoiced exctraction of a speech signal , short time energy
Dear all , please I have the following script : I'm trying to exctract voiced / unvoiced portions in a speech signal , I perform...

1 year ago | 0 answers | 0

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Question

error when using audioread within new function my_DFTwin
Dear all , Hi , Please I have a new function named my_DFTwin , I need to use audioread of audio file 'go.au' , and use the signa...

1 year ago | 0 answers | 0

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Question

Hi , I make spectral analysis for female voice ( wav file for 2 word only ) , I get frequency contents below 1000 Hz , so is this correct , also I suspect computation of power of abs(fft) , please advise , thanks
file1='Left_2_f.wav'; [y,fs] = audioread(file1); L=length(y); t=(1000*(0:1/fs:(L-1)/fs))'; n = 2^nextpow2(L); Y=fft(y,n); ...

2 years ago | 1 answer | 0

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Question

Hi , please what is the difference between randn and awgn , when adding white gaussian noise to get snr = 10dB , also I see difference in result when using snr function .
P_rms = rms(signal)^2; % noisy_signal_1 = awgn(signal,10,'measured'); noisy_signal_2 = signal+0.1*P_rms*randn(L_t,1); snr1=sn...

2 years ago | 0 answers | 0

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Question

Hi , please how to make a loop for subplot , I need to plot plot 5 signals on 3 rows & 2 columns , signals to plot x , y , cr_x , cr_y and cr_xy given below in the code for auto-correlation and cross-correlation
% Autocorrealtion and cross correlation f01=50; f02=500; fs=3000; dt=1/fs; t=0:dt:0.2; L=length(t); x=sin(2*pi*f01.*t)+(3...

2 years ago | 1 answer | 0

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Question

Question regarding compute and plot DC-centered Power Spectral Density for Time Autocoorelation function , Rx(tau)=exp(-tau/T) , I have 3 different T values ( 1 , 5 , 10 ) , code below but it is not showing PSD as expected
% script plotting Autocorrelation function for different T values % Plotting Power Spectral Density % Rx(tau)=exp(-tau/T)Rx(t...

2 years ago | 0 answers | 0

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Question

error message undefined function or variable ‘integral’ .
Dear all ,i made numerical integration in script bit i get error message : undefined function or variable ‘integral’ .

2 years ago | 1 answer | 0

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Question

Hi , I have a problem with phase plot for Fourier series coefficients for periodic function exp(-t/2) , why phase plot is not odd function ?
% FS for exp(-t/2) periodic signal % Compelx exponential FS clc clear; a=0 b=pi T0=b-a N=11 F0=1/T0 ...

2 years ago | 1 answer | 0

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Question

Hi - please what is the difference between normrnd and randn ?
How to use normrnd to generate random numbers from normal distribution with specific mean and variance ?

3 years ago | 1 answer | 0

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Question

Hi - Please why I don't get the excat amplitude in the spectrum of two added sine waves xt= 0.7*sin(2*pi*50*t)+sin(2*pi*120*t) , I mean i don't get excatly 0.7 for 50 Hz - nor excatly 1 for 120 Hz
% generate sin wave % FFT on N=2^nextpow2(L) clear; clc; Fs=1000 dt=1/Fs t=0:dt:1.5-dt; xt= 0.7*sin(2*pi...

3 years ago | 2 answers | 0

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Answered
ecg signal frquency contents
Hi code is attached. the signal also attached . Also the figure . I always get on the spectrum very low frequencies componen...

3 years ago | 0

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Question

ecg signal frquency contents
I need to determine frequncy contents of an ecg signal which i have loaded from a file , but the sampling frequency is Fs=1.0...

3 years ago | 2 answers | 0

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Question

Audio compression using DCT - but i get same size of files after inverse DCT
Hi I have a file ( 1.wav) - I'm trying to compress the first two seconds for this audio by using Discrete cosine transform . ...

3 years ago | 2 answers | 0

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How to compress audio file to lower bits
Hi How to compress audio file ( reduce bits ) for transmission .

3 years ago | 0 answers | 0

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Question

How to display whos y in GUI edit text or static text ?
file1='speech_demo.wav' [y,Fs]=audioread(file1); whos y How to display whos y in GUI edit text or static text ?

3 years ago | 1 answer | 0

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How to get multi-line text in GUI edit text ?
I get this warning on matlab GUI when using edit text Warning: Single line Edit Controls can not have multi-line text So how ...

3 years ago | 1 answer | 0

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Question

Audio file information to be shown as text on GUI text
Hi How to get the audiofile info to be shown on GUI as text : I mean i will prss a button in GUI and i need to show these info...

3 years ago | 1 answer | 0

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