离散时间信号处理PPT_第二章 离散时间信号系统

2 Discrete-Time Signals and Systems
2.0 INTRODUCTION
The term signal is generally applied to something that conveys information. The independent variable in the mathematical representation of a signal may be either continuous or discrete.
Digital Signal Processor
A kind of microprocessor used to implement digital signal processing algorithm
❖ The foundation of information technology is digitalization.
和距离的不同以及上行速率和下行速率 对称性的不同这两个方面
Digital Camera
Digital Camera
HDTV High Definition TV
PDP (Plasma Display)TV
Home Theater
DVD(Digital Video Disc)
GPS(Global Position System)
（Asymmetric Digital Subscriber Line)
ADSL是非对称数字用户线路 （Asymmetric Digital Subscriber Line）的
缩写，有时也作非对称数字用户环路 （Asymmetric Digital Subscriber Loop）。 它是一种在电话铜缆上进行较高速率数据 传输的方法，是DSL 的一种形式。它以普 通电话线路做为传输介质，既在普通双绞 铜线上实现下行高达8Mbit/s传输速度；上 行高达640Kbit/s的传输速度，我们只要在
Continuous-time signals are defined along a continuum of times and thus are represented by a continuous independent variable. Continuoustime signals are often referred to as analog signals.
❖ The kernel of digitalization is digital signal processing
❖ Most of digital signal processing, especially real-time processing are implemented by DSP processor
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Discrete-time signals are defined at discrete times, and thus, the independent variable has discrete values;
Digital signals are those for both time and amplitude are discrete.
普通线路两端加装ADSL设备，既可使用 ADSL提供的高带宽服务，通过一条电话线，
便可以比普通MODEM快一百倍
DSL（数字用户线路，Digital Subscriber Line）是以铜质电话线为传输介质的传输 技术组合，它包括HDSL、SDSL 、VDSL 、 ADSL和RADSL等，一般称之为xDSL。它 们主要的区别就是体现在信号传输速度
price ratio ❖ Lower power consumption or
longer battery life
CONTENT
➢ 2.DISCRETE-TIME SIGNAL AND SYSTEMS ➢ 3.THE Z-TRANSFORM ➢ 4.SAMPLING OF CONTINUOUS-TIME SIGNALS ➢ 6.STRUCTURES FOR DISCRETE-TIME SYSTEMS ➢ 7.FILTER DESIGN TECHNIQUES ➢ 8.THE DISCRETE FOURIER TRANSFORM ➢ 9.COMPUTATION OF THE DISCRETE FOURIER ➢ APPENDIX B CONTINUOUS-TIME FILTERS
❖ Higher processing speed ❖ Multi-DSP co-operation ❖ More powerful and convenient
development environment ❖ ASIC based on DSP core ❖ Lower wk.baidu.comrice or higher performance
Cruise missile
Smart bomb from F117
Pattern recognization
Fingerprint distinguish
Requirement of DSP Engineers is growing up rapidly
Development of DSP
离散时间信号处理PPT_第二章 离散 时间信号系统
Digital Signal Processing
The College of Electronics and Informatics Zhejiang Sci-Tech University 2005/06
Digital Signal ThPerooryc,emsesthinodg, algorithm
❖ DSP technology becomes hot front edge and is growing up rapidly.
DSP Solution
Mobile phone
The handset is not only used for voice communication
ADSL