数字信号处理(英文版)0-引言

The foundation of information
technology is digitalization. The kernel of digitalization is digital signal processing Most 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 rapidly.
Digital system：By the Nyquist Rule，the
processing speed is limited by the S/H, A/D and processor speed.
We still need analog processing
(3)The most signals in real would 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.
Digital system：Modify software.
Example：Analog filter, digital
filter, adaptive filter
Why digital?
（2）Precision
Analog system：component
specification: resistors have a tolerance 5%; capacitors 20% or worse Digital system：ADC bits, CPU word width and algorithm
Why digital?
（3）Stability
Analog system：the characteristics of
analog system components, resistors,
capacitors and operational amplifiers will change along with temperature, humidity Digital system：will show no variation with temperature throughout their guaranteed operation range.
Digital signal Processing
Introduction
Digital Signal Processing
Theory, method, algorithm
Digital Signal Processor
A kind of microprocessor used to implement digital signal processing algorithm
We still need analog processing
（1）Real-Time Processing
Analog system：Besides the
delay introduced by the circuit, the processing 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.
Radar/Sonar
Cruise missile
Smart bomb from F117
Pattern recognization
Fingerprint distinguish
Why digital?
（1）Programmability
Analog system：Modify
hardware design.
PDP (Plasma Display)TV
Home Theater
DB Digital AC-3
DVD(Digital Video Disc)
SET-TOP-BOX
STB（Set-Top - Box）
STB
Watchman
Simulator of airplane
GPS(Global Position System)
MIPS TECHNOLOGIES, INC. AND TI ANNOUNCE A STRATEGIC
RELATIONSHIP
MOUNTAIN VIEW, CALIF. and DALLAS, TX (Feb. 16, 1999) -- MIPS Technologies, Inc. (NASDAQ: MIPS) and Texas Instruments (NYSE: TXN) announced today a relationship to provide TI access to MIPS Technologies' processor cores in support of TI's digital signal processor (DSP) System Level Integration (SLI) solutions.
Why digital?
(7) Error Correcting Codes Data retrieval and transmission systems suffer from a number of potential forms of error. 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?
(4) Anti-noise
Why digital?
(5) Repeatability
computer A computer B Amplify A Amplify B
Signal generator
Why digital?
（6）VLSI (Very Large Scale Integrated circuit)
Requirement of DSP Engineers is growing up rapidly
ANALOG DEVICES AND INTEL
TO DEVELOP DIGITAL SIGNAL PROCESSING TECHNOLOGY
SANTA CLARA, Calif. (Feb. 3, 1999) - Intel Corporation and Analog Devices, Inc. announced today that they have signed a joint development agreement to design a Digital Signal Processing (DSP) core architecture, which will result in a fixed-point, low-power DSP core ideal for processing video, image, voice and data in emerging embedded communications and internet appliances.
数字信号处理(英文版)0-引言 digitalsignal processing introduction digital signal processing theory, method, algorithm microprocessorused implementdigital signal processing algorithm digital signal processor informationtechnology digitalsignal processing most digitalsignal processing, especially real-time processing dspprocessor asicbased dspcore dsp technology becomes hot front edge growingup rapidly. dsp solution programmable switch mobile phone onlyused voicecommunication vop (voice over package) hfc hybrid fiber-coax adsl (asymmetric digital subscriber line) software radio bpf local oscillator bpf adc dsp audio digital video lna digital camera digital camera hdtv high definition tv pdp (plasma display)tv home theater db digital ac-3 dvd(digital video disc) set-top-box stb set-top boxstb watchman simulator airplanegps(global position system) radar/sonar cruise missile smart bomb from f117 pattern recognization fingerprint distinguish why digital? programmabilityanalog system:modify hardware design. digital system:modif
Why digital?
(9) Data Compression The information channels cost and transmission bottlenecks make compression necessary for real-time processing. With analog compression 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 3.4kHz.
DSP Solution
Programmable switch
Mobile phone
The handset is not only used for voice communication
VOP (Voice over Package)
HFC（Hybrid Fiber-Coax）
ADSL
（Asymmetric Digital Subscriber Line)
Software radio
LNA
BPFBPFFra bibliotekADC
DSP
audio Digital video
Local oscillator
Digital Camera
Digital Camera
HDTV High Definition TV
Why digital?
(8) Data Transmission and Storage The Internet, Compact Disc (CD) and Digital Video Disc (DVD) brought information based on trouble-free highquality text, audio and video into the office and home. The fidelity of the digital medium is greater than that of the analog one.
Development of DSP
Higher processing speed Multi-DSP co-operation More powerful and convenient
development environment ASIC based on DSP core Lower price or higher performance price ratio Lower power consumption or longer battery life