Abstract: A system for detecting unknown broadband signals in noise consisting of non-stationary narrowband components and a stationary colored broadband component includes a sensor which collects data in which a signal of interest may be found and generates a received data stream. A preprocessor operates on the received data stream to generate training and detection vectors corresponding to noise only and noise plus signal intervals of the received data stream, respectively. A spectrum processor receives the training and detection vectors and generates cleaned broadband spectrum estimates {tilde over (C)}1(ƒ) and {tilde over (C)}2(ƒ) from the training and detection vectors, respectively, by adaptively separating non-stationary tonal components from the stationary broadband component using modified multiple taper spectral estimation combined with maximum likelihood tonal removal.

Abstract: A method for separation of acoustical data into narrowband and broadband time series components includes the steps of: constructing a data matrix in which time series samples of acoustical data are arranged in a forward-backward linear predictor matrix; decomposing a subband of the matrix into an in-band component and an out-of-band component; estimating narrowband components; estimating out-of-band leakage; removing the in-band narrowband component and the out-of-band narrowband component; repeating sequentially the afore mentioned five steps until narrowband components from all of the subbands of the matrix are removed from the acoustical data; and reconstructing the broadband time series; whereby to provide a narrowband time series estimate indicative of the presence of a signal in the acoustical data.

Abstract: A cover for a film iron used to iron on films on models such as model airplanes and the like. The cover is of natural fiber cloth to provide a controlled heat transfer and provides a relatively soft surface preventing marring of the film surface. The cover fits over the bottom of the iron and by means of a draw string is tied over sloping sides of the iron and an elongated iron handle. The cover is simply fabricated from two sheets of cloth sewn to provide a peripheral draw string passage and is formed to provide an upstanding rear draw string passage fitting under the handle which facilitates fitting the iron to the cover and tieing the draw string over the handle.

Abstract: An apparatus for rejection of turbulence induced flow noise for towed hydhone arrays. Two adjacent hydrophones in the array are spaced less than flow noise coherence distance apart forming a flow noise cancelling module. The inverted acoustic/flow noise signal from the lead hydrophone of the pair is split, one side passing to the final stage of signal processing while the other side, filtered, amplified and inverted, is added to the combined signal from the lag hydrophone which has been filtered and amplified. The acoustic signal components cancel leaving only the lead hydrophone flow noise plus the lag hydrophone flow noise which has been shifted by a factor dependent upon tow vessel speed and hydrophone spacing.