Sinusoidal Parameter Estimation Using Quadratic Interpolation around Power-Scaled Magnitude Spectrum Peaks

Kurt James Werner, François Georges Germain

Research output: Contribution to journalArticle

3 Citations (Scopus)
127 Downloads (Pure)

Abstract

The magnitude of the Discrete Fourier Transform (DFT) of a discrete-time signal has a limited frequency definition. Quadratic interpolation over the three DFT samples surrounding magnitude peaks improves the estimation of parameters (frequency and amplitude) of resolved sinusoids beyond that limit. Interpolating on a rescaled magnitude spectrum using a logarithmic scale has been shown to improve those estimates. In this article, we show how to heuristically tune a power scaling parameter to outperform linear and logarithmic scaling at an equivalent computational cost. Although this power scaling factor is computed heuristically rather than analytically, it is shown to depend in a structured way on window parameters. Invariance properties of this family of estimators are studied and the existence of a bias due to noise is shown. Comparing to two state-of-the-art estimators, we show that an optimized power scaling has a lower systematic bias and lower mean-squared-error in noisy conditions for ten out of twelve common windowing functions.
Original languageEnglish
Article number306
Number of pages22
JournalApplied Sciences
Volume6
Issue number10
DOIs
Publication statusPublished - 21 Oct 2016
Externally publishedYes

Bibliographical note

invited article

Keywords

  • acoustics
  • discrete Fourier transforms
  • frequency estimation
  • interpolation
  • signal analysis
  • sinusoidal modeling

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