数字信号处理英文版课件：Chapter_intro第四版

1、 Digital signal ProcessingIntroduction OutlineTextbook and ReferencesWhat is DSPApplications of DSPWhy DigitalTextbookDigital Signal Processing-A Computer-Based Approach 4eAajit K. MitraMcGraw Hill2012.8Prof. MitraReceived the M.S and Ph.D degrees in EE from U. of California, Berkeley in 1960 and 19

2、62, respectivelyWorked in Cornell U., AT&T Bell Lab, U. of California at Davis, and as Department Chairman at U. of California, St. BarbaraWas President of IEEE Circuits & Systems SocietyPublished over 600 papers in Signal and image Processing, twelve books, and holds five patents. A.V.Oppenheim and

3、 R.W.Schafer, Digital Signal Processing, 19752. S.J.Orfanidis , Introduction of Signal Processing, Prentice Hall,1998,Reference books:What is DSP Digital Signal ProcessingTheory, method, algorithmA kind of microprocessor used to implement digital signal processing algorithmDigital Signal Processor T

4、he foundation of information technology is digitalization.The kernel of digitalization is digital signal processingMost of digital signal processing, especially real-time processing are implemented by DSP processor or ASIC based on DSP core DSP technology becomes hot front edge and is growing up rap

5、idly. Applications of DSPDSP SolutionCommunicationMobile phone(infrastructure and handset)Fashion handsetsDiagram of GSM HandsetSoftware radioBPFLocal oscillatorBPFADCDSPaudioDigital videoLNASmartphone and MID（Mobile Internet Device）MIDGPS( Global Position System)GIS (Geography Information System)GP

6、SGISMeasurement and ControlVirtual Instruments(HP89441 Vector Analyzer)Shenzhou 9 docked with the Tiangong 1 Military and SafetyAir Early Warning，AEW Radar/SonarCruise missileSmart BombPilotless aircraftConsumeDC (Digital Camera), MP3, HDTV, and Home TheaterMedicalUltrasound, CT (Computed Tomography

7、), and MRI (Magnetic Resonance Imaging)Hearing AidWhy digital?（1）Programmability Analog system：Modify hardware design. Digital system：Modify software. Example：Analog filter, digital filter, adaptive filterWhy digital?（2）Precision Analog system：component specification: resistors have a tolerance 5%;

8、capacitors 20% or worse Digital system：ADC bits, CPU word width and algorithmWhy digital?（3）Stability Analog system：the characteristics of analog system components will change along with temperature, humidity Digital system：will show no variation with temperature throughout their guaranteed operatio

9、n range.Why digital?(4) Anti-noiseWhy digital?Amplify AAmplify BSignal generatorcomputer Acomputer B(5) RepeatabilityWhy digital?（6）VLSI (Very Large Scale Integrated circuit)Why digital?(7) Error Correcting CodesData retrieval and transmission systems suffer from a number of potential forms of error

10、.With information in a digital or binary form, we may easily build into the data stream additional “redundant” bits that are used to detect when an error has occurred.Why digital?(8) Data Transmission and StorageThe Internet, Compact Disc (CD) and Digital Video Disc (DVD) brought information based o

11、n high-quality text, audio and video into the office and home.The fidelity of the digital medium is greater than that of the analog one.Why digital?(9) Data CompressionThe information channels cost and transmission bottlenecks make compression necessary for real-time processing.With analog compressi

12、on some information is lost. A typical example is the bandwidth limiting applied to analog telephone lines in order to multiples calls, which limits the frequency response to 3kHz.We still need analog processing（1）Real-Time Processing Analog system：Besides the delay introduced by the circuit, the pr

13、ocessing is in real-time. Digital system：Decided by the processor speed.We still need analog processing（2）Processing very high frequency signals Analog system：may process microwave, mini-meter-wave, even light wave signals. Digital system：By the Nyquist Rule，the processing speed is limited by the S/

14、H, A/D and processor speed.We still need analog processing(3)The most signals in real world are analog.If we want to process these analog signals with digital signal processing system, must change them into digital form first by mixed signal processing.Development of DSPHigher processing speedMulti-DSP co-operationMore powerful and convenient development environmentASIC based on DSP coreLower price or higher performance price ratioLower power consumptio