Efficient high resolution parameter estimation of sinusoidal elements has been shown to be of fundamentalimportance in applications such as measurement, parametric decomposition of signals and low bitrate audio coding.Certain methods such as the Complex Spectral Phase Evolution (CSPE) method can be used to estimate the truefrequency, magnitude and phase of underlying tones in a signal with accuracy that is significantly more precise thanthe signal resolution of a transform-based analysis. These methods usually require the signal elements to bespectrally separated so that the mutual interference is minimal (often referred as the "analysis window main lobewidth"). This paper extends the methods introduced in the CSPE for low frequency real tone signals, where theinterference or "leakage" from the negative frequencies is unavoidable, regardless of the analysis window used. Thenew technique gives improved magnitude and phase estimates for the sinusoidal parameters.
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