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1. Store a suitable audio .wav file as an array x. Let N be the size of the array. If N is not a multiple of 4, append one, two or three zeros (as required) to make the array size a multiple of 4. 2. Obtain the FFT of the signal, fftshift it, and plot the transform. 3. Obtain 50% compression. For this, set the first N/4 and the last N/4 transform values to zero. It is very important for this to be exact (hence N should be a multiple of 4). A mismatch will result in a non-symmetric transform and will have a complex IFFT. 4. Obtain the IFFT of the compressed signal after fftshift one more time and play it at the same sampling frequency as the original signal. This is the compressed signal. Try compressing to different extents and identify approximately at what extent the signal sounds distorted.
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hwmadeeasy
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November 24, 2021
MATLAB simulations
audio compression MATLAB
EE458L COMMUNICATION AND DSP LAB
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2. Find the N-point frequency vector (W) and plot the frequency response of the following system with respect to normalized frequency. You need to plot 4 graphs (the real part, the imaginary part, the magnitude spectrum, and the phase spectrum) on a sheet of paper. (Use subplot, plot, title and gtext commands.) Take N=512.
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hwmadeeasy
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November 22, 2021
MATLAB simulations
DTFT calculation
DTFT MATLAB
ece 468
frequency response MATLAB
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1. Plot the following DTFT with respect to normalized frequency. You need to plot 4 graphs (the real part, the imaginary part, the magnitude spectrum, and the phase spectrum) on a sheet of paper. (Use subplot, plot, title and gtext commands.) Given W=0:pi/N:pi; N=256.
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hwmadeeasy
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November 22, 2021
MATLAB simulations
DISCRETE TIME FOURIER TRANSFORDISCRETE TIME FOURIER TRANSFORM
DTFT calculation
DTFT MATLAB
ece 468
frequency response MATLAB
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Design an impulse response (h[n]) for the following system using above-mentioned commends in MATLAB:nynynyny [][][][]302.0236.0144.08.0−+−+−−=nxnxnxnx The input sequence (x[n]) is given as: []()2010sin− =nunnxπ with n = 0: 1:40. Find the outputs sequence (y[n]) using conv and filter functions. Please plot the impulse response (h[n]), the input sequence (x[n]) and the outputs sequence (y[n]) in one figure using subplot function.
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hwmadeeasy
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October 5, 2021
MATLAB simulations
matlab filter output
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Matlab Assignment I. Generate 1200 samples of the AM signal x[n] with modulation index equal to 1. a. Use the sampling frequency fs = 20 kHz; carrier frequency fc = 1000 Hz; and a 50 Hz sine wave as your message signal. b. Generate the AM signal according to the equation x(t) = [A + m(t)]cos(ωct). Since, modulation index μ = 1/A, the DC amplitude is A = 1/ μ. c. Plot your generated AM time series. II. Rectify the signal x[n] (convert all negative samples to positive ones) and LPF the resulting signal (use the digital LPF design from Lab 3). Use 150 Hz as the bandwidth of the LPF and 63 as filter order. Plot the filtered output. This should look like the message sine wave after an initial transient. –
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hwmadeeasy
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October 4, 2021
MATLAB simulations
am modulation and demodulation in MATLAB
EE458L COMMUNICATION AND DSP LAB
Matlab simulation of AM wave
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