System and method for determining signal-to-noise ratio (SNR), signal-to-noise and distortion ratio (SINAD) and total harmonic distortion (THD)
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United States of America Patent
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Feb 22, 2011
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Jun 25, 2009
app pub date -
Dec 21, 2007
filing date -
Dec 21, 2007
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Abstract
A system for determining signal-to-noise ratio (SNR), signal-to-noise and distortion ratio (SINAD), and total harmonic distortion (THD), includes logic for estimating a frequency of a dominant sinusoidal signal present in a sampled data record, logic for iteratively fitting a curve, the curve including a fundamental sinusoid, harmonic components and a DC offset, and logic for computing SNR, SINAD and THD using the fundamental sinusoid, harmonic components and a DC offset.
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