An analog signal’s characteristic quantity representing data may  66). at any instant, any value within a continuous(67). For ex

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问题 An analog signal’s characteristic quantity representing data may  66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68)elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69),  and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70)number of well-defined discrete values that one of its characteristic quantities may take in time.

选项 A、limited
B、finite
C、restricted
D、bounded

答案B

解析 模拟信号表示数据的特征量,在任一时刻,可取某一连续区间内的任一值。例如,模拟信号可以连续地跟随表示数据的另一物理量的值。离散信号由时间上相继的各元素组成,其中每一元素都有一个或多个能表示数据的特征量。特征量的例子有振幅、波形、持续时间和当时位置。数字信号是离散信号的一种特例,其中的数据由已明确定义、个数有限的离散值来表示,各值均可由该信号的特征量之一随时间来取。
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