Amplitude modulation (AM)

Sample discrete signal 

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Discrete spectrum: Fast Fourier Transform (FFT) 

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Carrier signal 

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Amplitude modulation 

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Discrete spectrum: Fast Fourier Transform (FFT) 

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Amplitude demodulation 

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Discrete spectrum: Fast Fourier Transform (FFT) 

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Filter (10Hz to 30Hz)

Define filter 
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Filtered signal 
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Converted by Mathematica      January 13, 2003