题目

英语翻译
1.把信号只在某些不连续的瞬时给出函数值,成为离散时间信号.它可以来自模拟信号的抽样,或者是时间和幅度均不边续的离散信号.在离散信号的分析和处理时,通常把按一定先后次序排列在时间上不连续的一组数的集合,称之为”序列”.
2.两个不同的序列可以对应相同的Z变换,而收敛域并不相同,因此,为了使序列和Z变换是一一对应,在给出序列Z变换的同时,必须指定其收敛域.
3.在离散时间信号的分析和处理中,常常要对序列进行相加,相乘,延时和卷积等运算,Z变换的特性对于简化运算非常有用.

提问时间：2020-11-03

答案

1. Signal only in certain discrete function of the instantaneous value is as discrete-time signal. It analog signal from the sample, or is not the time and the magnitude of the added edge discrete signal.Discrete signal analysis and processing, usually by a certain time in order not for a group of pool called "sequence."
2. Two different sequences can be the same as the corresponding Z transform, and the convergence domain is not the same, therefore, To sequence and Z transform is uniquely presented in sequence Z transform, we must designate their convergence domain.
3. In discrete-time signal analysis and processing, often to the sequence together, multiply, and delay operations such as convolution, Z-transform the properties for simplified operation very useful.