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:

1､一位二进制数值比较器 讨论：A和B相比较的情况有三种可能 在一些数字系统中,经常要求比较两个数字的大小。 为完成这一功能所设计的这种电路称为数值比较器

4.19 解: 设计思路:用同余的概念,也就是说 (0011)余3BCD → (0000)8421BCD

本章主要介绍二部分内容:

上面介绍了动态显示电路

每个器件的逻辑规模小，功耗相对比 较大，用 其构成的系统布线复杂，占 用PCB ( Printed Circuit Board) 板面积大

一、频率响应 二、传输函数 三、简单滤波器 四、一些特殊的传输函数

Stability Condition in Terms of the Pole Locations A causal lti digital filter is BIBO stable if and only if its impulse response h[n] is absolutely summable, i.e

Phase and Group Delays The output y[n] of a frequency-selective LTI discrete-time system with a frequency response(@) exhibits some delay relative to the input x[n] caused by the nonzero phase response 0(@) =arg{()} of the system

1. 工作描述 可用以下四组方程来描述:激励方程､状态方程､输出方程､时钟方程