Time-Variant Least Squares Harmonic Modeling
Abstract
An algorithm for harmonic decomposition of time-variant signals is derived from a least squares harmonic (LSH) technique. The estimates of harmonic amplitudes and phases are formulated as the solution of a set of linear equations for minimizing mean square error; the signal frequency is modeled by a linear or quadratic polynomial and obtained via a local search over polynomial coefficients. An initial estimate of signal frequency is necessary to reduce computation time. This method is capable of producing accurate and robust harmonic estimation in low SNR situations. We show applicability to high accuracy speech pitch and heart sound beat epoch estimation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2003
- Accession Number
- ADA436659
Entities
People
- Les Atlas
- Qin Li
Organizations
- University of Washington