制作流程 一、住宅楼模型的制作 二、住宅楼材质的制作 三、住宅楼相机和灯光的设置 四、住宅楼效果图的后期处理

8.1概述 (1)吸收的目的 在化学工业种,将气体混合物种的各组分加以分离,其目的是:①回收或捕获气体混合物中的有用物质,以制取产品;②除去工艺气体中的有害成分,使气体净化,以便进一步加工处理,如有害气体会使催化剂中毒,必须除去;或除去工业放空尾气中的有害物,以免污染大气

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:

一、Textbook S.K. Mitra, Digital Signal Processing-A Computer-Based Approach, Third Ed

一、滤波器的图示及分析 二、等效结构 三、基本的FIR滤波器结构 四、基本的IIR滤波器结构

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

Later in the course we shall review various methods of designing frequency-selective filters satisfying prescribed specifications · We now describe several loworder- FIR and IIR digital filters with reasonable selective frequency responses that often are satisfactory in a number of applications Copyright 2001, S. K. Mitra

Linear-Phase FIR Transfer Functions It is nearly impossible to design linear- phase IIR transfer function It is always possible to design an FIR transfer function with an exact linear-phase response

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

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