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On two fundamental properties of the zeros of spectrograms of noisy signals
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DOI：10.1016/j.sigpro.2026.110651.png)
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Abstract
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• We compute the local density of zeros of the spectrogram of noisy signals. • We explain the delineation and trapping effects observed with zeros. • Results are applied to Hermite functions, single chirps and interfering chirps.
Keywords:
Spectrogram zeros
Rouché’s theorem
Hermite functions
linear chirps
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