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1、Specific English for Electronic Information Engineering Teacher：张培珍 Guangdong Ocean University Lesson 9: Digital signal processing Index Pre-reading 9.1 Signal processing 9.2 Digital signal processing 9.3 The development of Digital Signal processing 9.4 Digital signal processor Pre-reading 1 2 3 wha
2、t is signal processing? what is digital signal processors? What is digital signal processing? Read the lesson, paying attention to the following questions. Remind the Words and expressions Glorious Evident Acoustics Seismography Domain Extract Desirable Interpolation Algorithm Natural Tendency Sophi
3、sticated Logarithm Further Restricted suitable Remind the Words and expressions Curriculum Technique Code Programmable Incorporate Fetch Multiply Execution Bio-engineering Fourier transform Fast Fourier transform (FFT) 9.1 Signal processing (1)Signal processing is evident in different domains, such
4、as bio-engineering medicine, acoustics, radar, seismography, pronunciation correspondence, digital communication, nuclear science as well as other domains; 9.1 Signal processing (2) Extract characteristic parameter in ECG (electrocardiogram) analysis or in speech transmission and speech recognition;
5、 (3) Remove interference and noise; (4) Turns signal for easier to interpret; Words and expressions Signal processing Glorious Bio-engineering medicine Acoustics Radar Seismography Pronunciation- correspondence 信号处理 光荣的，显赫的 生物工程医学 声学 雷达 地震学 语音通信 Words and expressions Digital communication Nuclear sc
6、ience Situation ECG analysis Speech transmission Speech recognition Extract Characteristic parameter 数字通信 核科学 条件，环境 心电图分析 语音传输 语音识别 提取 特征参数 Words and expressions Interference noise Specialist Interpret 干扰 噪声 专家 解释，说明 9.2 Digital signal processing (1)Is concerned with representation of the signal seq
7、uence, expressing and processing the signal sequence; (2)Estimates the signal characteristic parameter; (3)Transform the signal into a desirable form. Digital signal processing algorithms (1) Numerical analysis formula (2) Interpolation, integration, differentiation; Signal processing algorithm sign
8、al processing algorithm as following figure: Words and expressions Representation Signal sequence Estimate Characteristic parameter Classical Numerical analysis Formula Interpolation Integration 代表，表示 信号序列 估计 特征参数 经典的 数值分析 公式 插值 积分 Words and expressions Differentiation Algorithm Promote Ingenious Si
9、multaneous Integrated circuit craft Economical Implementation 差分 算法 促进，推动 巧妙的，设计独特的 同时的 集成电路工艺 经济的，节约的 完成，实现 Fourier transform and FFT (1)A tendency to experiment with sophisticated signal processing algorithms. (2)Requires the explicit evaluation of inverse Fourier transform of logarithms of the Fo
10、urier transform of the input. Logarithm of FT FT Words and expressions Natural Tendency Increasingly Sophisticated Algorithm Explicit Evaluation Inverse Fourier transform logarithm 自然的 趋势 增加的 诡辩的，复杂的精致的 算法 明确的，清楚的 评价 傅里叶反变换 对数 Fourier transform and FFT (1)In 1965, an efficient algorithm for Fourier
11、transform is disclosed. (2)FFT reduced the computation time by orders of magnitude. Fourier transform and FFT Image and its Fourier spectrum Words and expressions Evolution Accelerated Disclosure Efficient algorithm Orders of magnitude Permitted Sophisticated Interaction with 进化 加速的 公开的 有效的算法 几个数量级
12、允许的 复杂的 交互 Implication of FFT (1)Tied to discrete-time concept. (2)Stimulating a reformulation of signal processing concepts and algorithm. Words and expressions Implication Inherently Discrete-time Concept Stimulate Reformulation Mathematics Discrete-time domain 含义，含意 固有的，天性的 离散时间 概念 鼓舞，刺激 再形成 数学的
13、离散时间域 Development (1)Dated from 1960s. (2)Not widely used at that time, was available in universities and scientific research institutions. Words and expressions Dated from Utilize Mainframe Available University Scientific research institution 追溯至 利用 主机 适用于 大学 研究所 Application (1)In the 1980s and the
14、 90s, provide bigger development space to DSP. (2)Quickly entered the commercial marketplace. (3)Arrived at peoples ordinary life. Words and expressions Expensive Restricted Military Government Commercial marketplace Mobile telephone Compact disc player Electronic voice mail 昂贵的 受限的 军事 政府 商业市场 移动电话
15、影碟机 电子语音信箱 Curriculum (1) 1980s, was specialized graduate curriculum in the electronic engineering. (2)1990s, became a part of undergraduate curriculum. (3)Today, becomes a necessary skill by multi- domain scientists and engineers. Words and expressions Specialized Graduate student Undergraduate Cur
16、riculum Multi-domain Revolutionized 专业的 研究生 本科生 课程 多领域的 引起革命的 Digital signal processor DSP (1) Introduced in the late 1970s and early 1980s; (2)DSP is programmable device; (3) Has its own native instruction code; (4) can carry out millions of floating point operations per second; Digital signal processor DSP Words and expressions Introduction Manufacturers Specialize Microprocessor Architecture Programmable Native instructio
