System and method for determining signal-to-noise ratio (SNR), signal-to-noise and distortion ratio (SINAD) and total harmonic distortion (THD)

摘要

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.