In the latter two cases, one may take advantage of the fact that the label assignments of individual segments may repeat themselves (for example, if a person speaks at several separate occasions during a conference) by attempting to cluster the segments according to their distinguishing properties (such as the spectral content of each speaker's voice).
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IEEE 802.22, is a standard for wireless regional area network (WRAN) using white spaces in the television (TV) frequency spectrum.
The FCC allowed a new portion of high-frequency spectrum to be allocated for WiFi networks in 2003.
Wien approximation, an equation used to describe the short-wavelength (high frequency) spectrum of thermal radiation