内容提示：连续时间信号(Continuous-Time Signals)的时域描述 离散时间信号(Discrete-Time Signals)的时域描述。连续时间信号的基本运算。
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basic continuous time signals 基本的连续时间信号
Sampling of continuous-time signals 连续时间信号的取样
continuous-time and discrete-time signals 连续时间信号和离散时间信号
In many contexts, processing discrete-time signal is more flexible and is often preferable to processing continuous-time signals.
在许多方面，处理离散时间信号要更加灵活些，因此比处理连续时间信号更为可取。
High frequency pulsed sounds might be used for echolocation, and low frequency time continuous signals related with communication and emotive state expression.
高频脉冲信号可能与回声定位有关，而低频连续信号可能与通信和情感表达有关。
In the control system of sampling, signal to be dealt with is the pulse sequence after sampling from the continuous time signals.
采样控制系统中，所处理的信号是连续时间信号经采样后所得到的脉冲序列。
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