Signal processing apparatus, and voltage or current measurer utilizing the same
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United States of America Patent
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Issued Date -
Aug 4, 2005
app pub date -
Jan 31, 2005
filing date -
Feb 2, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A signal processing apparatus produces a signal representing the effective value of an inputted alternating signal. The apparatus includes a square calculator, a filter and a square-root calculator. The square calculator produces a square signal representing several squared values of the inputted alternating signal. The filter extracts a DC component signal from the square signal. The square-root calculator produces a signal representing the square root of a level value of the extracted DC component signal.
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