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- W2023277872 abstract "In the usual shift-register/delay-line arrangement, as detailed by Anderson (1960, 1961) and Rudnick (1960), geometry of the array, in conjunction with sound velocity in the medium, establishes a time delay for each wavefront arrival at a particular phone. The pressure waveform is then stored in each shift register, and is then clocked at a rate sufficiently above the Nyquist frequency, such that degradation of zero crossover information is avoided. Sampling the shift-register matrix, at points appropriate to the array geometry, will result in a gain for the signal emanating from a given direction. One characteristic feature of the DIMUS system is an amplitude normalization, which devolves from the binary nature of quantization. Thus, from the maximum signal-to-noise ratio to the minimum, from +∞ to −∞ dB, a response ratio corresponding to the directivity index is achieved. For 100 hydrophones, this range would be 20 dB (re power); for 10 phones, 10 dB, etc. The levels are thus predictable, regardless of pressure level of the source as seen at the array. The paper discusses the analytic and computer simulation aspects of these phenomena. Correlation functions are derived analytically and compared with simulation results for several cases." @default.
- W2023277872 created "2016-06-24" @default.
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- W2023277872 date "1963-05-01" @default.
- W2023277872 modified "2023-09-23" @default.
- W2023277872 title "Analysis of a Computer Simulation of a DIMUS System" @default.
- W2023277872 doi "https://doi.org/10.1121/1.2142516" @default.
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