Adjourn
发表于 2025-3-25 04:40:57
Background 1852 and the development of the electric telegraph greatly enhanced the speed and the reliability with which messages could be conveyed, and led to the widespread use of signalling for purposes other than warfare and defence.
法律的瑕疵
发表于 2025-3-25 10:08:35
Periodic Signalsform is quasi-periodic and may usefully be treated as truly periodic for some purposes. It is worth noting that a truly repetitive signal is of very little interest in a communications channel, since no further information is conveyed after the first cycle of the waveform has been received. One of t
轻率的你
发表于 2025-3-25 12:28:05
Aperiodic Signalsetitive in nature and which cannot therefore be represented by Fourier series containing a number of harmonically-related frequencies. Fortunately, however, it is possible to derive frequency spectra for such signals using as a starting point the work we have already done on the Fourier series.
首创精神
发表于 2025-3-25 19:48:02
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Electrolysis
发表于 2025-3-25 21:00:42
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做作
发表于 2025-3-26 00:40:44
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没有准备
发表于 2025-3-26 08:17:38
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overweight
发表于 2025-3-26 09:26:27
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prostatitis
发表于 2025-3-26 15:19:21
Ernst Kofrányi,Friedrichkarl Jekatignal applied to its input. In other words, it is regarded as an ‘input-output’ device, whose detailed internal construction does not concern us. This is often referred to as the ‘black-box’ approach: it involves us in mathematical descriptions of the overall performance of the signal processor, but
完成
发表于 2025-3-26 18:49:23
https://doi.org/10.1007/978-3-642-91173-6on. But in spite of these advantages of linear processing, the reader is asked to bear in mind that a variety of useful signal techniques may be achieved by using nonlinear systems and devices, and that the analysis and synthesis of signals and systems by reference to Fourier and Laplace transform t