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Harminv is a program (and accompanying library) to solve the problem of harmonic inversion. Given a discrete-time, finite-length signal that consists of a sum of finitely-many sinusoids (possibly exponentially decaying) in a given bandwidth, it determines the frequencies, decay constants, amplitudes, and phases of those sinusoids. Harminv can, in principle, provide much better accuracy than straightforwardly extracting FFT peaks because it assumes a specific form for the signal. (Fourier transforms, in contrast, attempt to represent *any* data as a sum of sinusoidal components.) It is also often more robust than directly least-squares fitting the data (which can have problematic convergence). Harminv employs the "filter diagonalization method" (FDM) of Mandelshtam and Taylor.


User manpage available in HTML format from


Download version 1.2.1 (stable)
released on 20 May 2004



LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey18 May 2004

Leaders and contributors

Steven G. Johnson Maintainer

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Support E-mail

Software prerequisites

Kind Description
Required to use BLAS
Required to use LAPACK

This entry (in part or in whole) was last reviewed on 7 January 2008.


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