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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sonar signal processing ： ウィキペディア英語版 Sonar signal processing No matter the active sonar or passive sonar, when receiving the acoustic signal reflected from the target, the information included in the signal can not be directly collected and used without technical signal processing. To extract the efficient and useful informations from the mixed signal, some steps should be taken to transfer sonar data from raw acoustic data reception to detection output. Thus, for the active sonar, six steps are needed during the signal processing system. centre centre == Signal generation == To actually generate in hardware as signal pulse typical analog implementations are oscillators and voltage controlled oscillators (VCO) which are followed by modulators. Amplitude modulation is used to weight the pulse envelopes and to translate the signal spectrum up to some suitable carrier frequency for transmission. First, in sonar system, the acoustic pressure field can be represented as $s(t,\backslash vec\; r)$. The field function include four variables: time $t$ and spatial coordinate $d\backslash vec\; x\; dt,$ $\backslash vec\; k=(k\_x,k\_y,k\_z),$ $,$ as elemental signal, for the reason that any 4-D can be generated by taking a linear combination of elemental signals. Obviously, the direction of $\backslash vec\; k$ gives the direction of propagation of waves, and the speed of the waves is right $v\; =\; \backslash frac$ The wavelength is $\backslash lambda=\; \backslash frac$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sonar signal processing」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.