user559678
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What is a periodic signal in image processing?
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You can think of the periodic signals like sine and cosine are basis for building other signal. See this figure for a 1-D example. For images, sine and cosine extend to 2-D patterns as something like ...

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Down sampling an EEG signal
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Actually I am not quite sure if you should/need to downsample it with conventional methods. Did you consider using CNN (with stride larger than 1) first and then feed segment of the output to LSTM? ...

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