Denoising the sinusoidal signal

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Answer 1

[Image Analyst]

Yeah, most likely we can help. Read this link first.

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Here's a start on the code. See if you can finish it.

% Figure out how many samples you need at a sampling rate of 5 kHz to get 50 ms.
numSamples = your computations....
t = linspace(0, 50, numSamples) % Units are milliseconds
x = sin(2 * pi * 100 * t) + 0.7 * cos(2 * pi * 500 * t);
xn = x + sigma * randn(........)
originalSpectrum = fft(x); % Get spectrum of original signal.
noisySpectrum = ...............% Get spectrum of noisy signal.
subplot(2, 1, 1);
plot(abs(originalSpectrum), 'b-', 'LineWidth', 2);
grid on;
xlabel('t');
ylabel('x');
subplot(2, 1, 2);