On the base of hardware approach, to discuss all the theory involve in active detecting sonar system, including the selection of signal waveform, digital signal sampling, digital signal processing.
以硬件为基础，对所涉及到的理论都作论述，包括探测声纳的信号波形选择，数字信号采样、处理原理与方法。
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Sampling foreign foods is a highlight of many tourist itineraries but a particular group of rich Indians take a different approach to eating overseas; they bring along their own chefs.
Anew approach, named Modified Fast Fourier Transform (MFFT), is proposed to analyze the components of a periodic signal when sampling duration is not equal to an integer multiple of the fundamentals.