Sampling from a frequency-domain perspective: simple cosine

Oversampled [Graphics:../Images/index_gr_12.gif]

Sampling frequency 
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Original waveform 
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Frequency spectrum (CT) 
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Frequency spectrum of sampled signal 
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Ideal filter 
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Sampled, filtered spectrum 
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Ideally reconstructed signal 
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Undersampled [Graphics:../Images/index_gr_41.gif]

Sampling frequency 
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Original waveform 
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Frequency spectrum (CT) 
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Frequency spectrum of sampled signal 
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Ideal filter 
[Graphics:../Images/index_gr_56.gif]
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Sampled, filtered spectrum 
[Graphics:../Images/index_gr_59.gif]
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Ideally reconstructed signal 
[Graphics:../Images/index_gr_62.gif]
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Converted by Mathematica      February 3, 2003