Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1995-09-11
1996-08-13
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324 7624, 324 7642, 364485, G01R 2300
Patent
active
055459765
ABSTRACT:
A narrowband spectrum analyzer separates and analyzes a chosen segment of a periodic signal. The signal to be analyzed is digitized by an A/D converter. A gate generator is configured to trigger on a particular portion of the signal waveform and to identify the beginning and end of the chosen segment. Over the interval of the segment, the gate generator produces a digitized gate sequence. The envelope of this sequence may be rectangular or, preferably, may be that of a particular window function. The digitized signal is multiplied by the gate sequence and the multiplier output is then furnished as a train of gated segments to a signal processor for narrowband (high resolution) spectrum analysis. The length of the train is chosen to enable the signal processor to provide the desired resolution. Provision is made for removal of any DC component in the chosen segment before multiplication to reduce the possibility of aliased spectral terms in the processor output. Presuming that the signal within the segment interval is a portion of an underlying, continuous signal, provision is made for inferring the amplitudes of the components of the continuous signal.
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Hewlett--Packard Company
Solis Jose M.
Wieder Kenneth A.
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