Frequency Spectrum
The researchers have conducted a strict and complete spectrum measurement from December 2006 to July 2007 at two locations in Aachen, Germany, and one location in Maastricht, Netherlands. The measured bands ranges from 20MHz to 6GHz and are composed of four subbands of each1.5GHz bandwidth. A resolution bandwidth of 200 kHz is chosen as a compromise between frequency resolution and the maximum supported span. So, each subband of 1.5GHz bandwidth includes 8192 measurement points, which will cause a small overlap between adjacent measurement channels.
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Frequency Spectra for an industrial polishing process under two different process conditions. The silhouettes of the spectra correspond to the 25th and 75th percentile of the energy for the 600 samples of spectra from each class.
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