Time Selective Spectrum Analysis Separates Frequency Domain Characteristics Of: Vertical Interval Test Signals, Quiet Lines And Equalizing Pulse To Evaluate Bandwidth, Noise And Intermodulation Products Non-intrusively On A CATV System. (1992)
By Francis M. Edgington, Hewlett Packard Company
Complex modulation, crowded frequency spectra, and the demand for higher signal quality require that high dynamic-range measurements be performed on operating systems without interrupting service. The problem of locating the point at which the signal has gone bad is further complicated when testing large systems containing many different functions. The ability to view at a specific instant a signal's spectrum in the presence of modulation is key to non-intrusive diagnosis of system problems.
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