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A time series syntesized from two sinusoids at 12.5 and 75 Hz at 2-ms sampling rate remains unchanged when resampled at 4 ms. However, at 8 ms, its high frequency component shifts from 75 to 50 Hz, while its low-frequency component remains the same.
From Investigations in Geophysics No.2: Seismic Data Processing, Ozdogan Yilmaz, 1987. |