What does a window do?(THE DATA DETECTIVE)(discrete Fourier transform )(Advertisement) From: Test & Measurement World | Date: May 1, 2005 | COPYRIGHT 2005 Reed Business Information. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

Instead of a pure Fourier transform, engineers and researchers must settle for the discrete Fourier transform (DFT), which operates on sampled data. That data may come from a digital oscilloscope, a data-acquisition system, or another instrument. Because the DFT operates on discrete points taken over a finite sampling period, its results are not perfect. Apply a DFT--usually implemented as a fast Fourier transform (FFT) algorithm--to a sampled sine wave, for example, and the power-...

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