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- W2000269498 abstract "Efforts to determine the low-frequency spectrum of ambient sea noise have shown that there exist slow variations in the noise power in the ocean. These variations amount to a modulation of a “short-term” estimate of the frequency spectrum of the noise. A search for this modulation has been made by filtering the sea noise from a single deep hydrophone into nonoverlapping frequency bands and then detecting and recording the envelopes of the variations within these bands. The envelope variation has been investigated by examining the self- and cross-spectra of the set of envelopes for the bands analyzed. From these results, the coherencies of the covariation between bands of frequency versus the modulation periods were calculated. For a stationary random process, the coherency should vanish. The data analysis, thus far, which includes stretches up to one day in length, shows very small coherence between bands centered an octave apart. This implies that either the noise is almost stationary or the “modulation” is incoherent for these frequency separations. [Work supported by the U. S. Navy Office of Naval Research.]" @default.
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- W2000269498 date "1967-11-01" @default.
- W2000269498 modified "2023-09-25" @default.
- W2000269498 title "On Measuring the Stationarity of Ambient Sea Noise" @default.
- W2000269498 doi "https://doi.org/10.1121/1.2143970" @default.
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