Standard[ s t aen dad]n.标准 Hierarchy ['h a iara:ki]n体系,分层结构 Synchronous['s i6 k ranas]a同步的 Approve ra p r u:v]v.批准,审订,通过 Tributary [t r i bj u tar i]a支流的,从属的,辅助的 Map[map]v.绘制,设计,映射,变换
I单项选择 1.抽样频率 a. sampling rate b. repetition rate c. sampling frequency 答案:c 2.数字通信 a. digital communication b. digital transmission. transmission path 答案:a
Discrete-Time Systems A discrete-time system processes a given input sequence x[] to generates an output sequencey[n] with more desirable properties In most applications, the discrete-time system is a single-input, single-output system:
Z-Transform The DTFT provides a frequency-domain representation of discrete-time signals and LTI discrete-time systems Because of the convergence condition, in many cases. the DTFT of a sequence may not exist As a result, it is not possible to make use of such frequency-domain characterization in these cases
