Method for estimating resonance frequencies
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United States of America Patent
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Feb 19, 2008
Grant Date -
Oct 12, 2006
app pub date -
Aug 11, 2004
filing date -
Aug 11, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is related to a method for estimating from an input signal the resonance frequencies of a system modelled as a source and a filter, comprising the steps of--determining the Z-transform of the input signal,--calculating the differential-phase spectrum of the Z-transformed input signal, whereby the Z-transform is evaluated on a circle centered around the origin of the Z-plane,--detecting the peaks on said differential-phase spectrum,--attributing the peaks to either the source or the filter,--estimating the resonance frequencies from the peaks.
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