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Sound comfort becomes more and more important in residential houses. Home appliance is one of the main sources of indoor noise. Noise emission is a distinctive feature for the selection of the home appliances. Noise levels in household appliances are increasingly attracting attention from manufacturers and customers. Refrigerators as common appliances used by most families run continuously all day...
This paper is based on the frequency range characteristics of ship radiated noise. The “Three Highlights” model of the short-distance ship radiated noise is adopted and the possibility of locating and identifying by taking ships as volume targets is discussed. The location algorithm of different parts is discussed here. And based on the completed all-digital processing hardware platform, the time-delay...
In this thesis, the statistical characteristics of ship-radiated noise are discussed. Then, a mathematical model of the noise reconstruction is established for given sea depth and straight distance. The model includes the main characteristics of ship-radiated broadband noise: the continuous power spectrum, the line spectrum, the envelope spectrum, the total radiated sound power and the sound level...
In order to enhance the practicality of digital watermarking, watermark perceptibility and robustness must be ensured. Taking human visual system characteristics into account fully, a digital watermarking multi-objective optimization based on multi-wavelet method is proposed. It utilizes Sa4 multi-wavelet to embed digital watermark, chooses intermediate frequency in embedding digital watermark adaptively...
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