| 摘要 |
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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