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1、Unit 18 DSP (Digital Signal Processing),数字信号处理,Part Three Communication and Information Processing,Technical terms: Digital Signal Processing (DSP) 数字信号处理 Fourier transform 傅立叶变换 Fast Fourier Transform (FFT) 快速傅立叶变换 spectrum analysis 频谱分析 speech bandwidth compression systems 语音带宽压缩系统 echo removal 回声
2、消除 analog spectrum analyzers 模拟频谱分析仪,Preparing for the text:,Questions for text discussion: 1. Please take some examples about the subfields of DSP. - Digital signal processing is concerned with the representation of signals by sequences of numbers or symbols and the processing of the sequences. 2.
3、What is the propose of DSP? -The goal of DSP is usually to measure, filter and/or compress continuous real-world analog signals. 3. Please describe the processing procedure of DSP. - ADC，digital singnal processing and DAC.,Preparing for the text:,The main idea of this unit:,This unit mainly introduc
4、es DSP technology. What is DSP? Digital signal processing is concerned with the representation of signals by sequences of numbers or symbols and the processing of the sequences. Whats the function of DSP? The goal of DSP is usually to measure, filter and/or compress continuous real-world analog sign
5、als. (3) The processing process of DSP : ADC, digital signal processing and DAC. (4) FFT: fast Fourier transform.,1.sequence n. 序列 * Digital signal processing is concerned with the representation of signals by sequences. 译：数字信号处理主要研究表示信号的序列。 2. estimate vt. 估计 * The purpose of such processing may be
6、 to estimate characteristic parameters of a signal or to transform a signal into a form which is in some sense more desirable. 译：这样处理的目的可能是估算信号的特征参数，也可能是把信号变换成某种更符合要求的形式。,New Words,3. characteristic adj. 特征的 parameter n. 参数 * characteristic parameters 特性参数 4. interpolation n. 内插 integration n. 积分 di
7、fferentiation n.微分 algorithms n.算法 * The classical numerical analysis formulas, such as those designed for interpolation, integration, and differentiation, are certainly digital signal processing algorithms. 译：经典的数值分析公式，如为内插、积分和微分而设计的公式应该属于数字信号处理算法。,5. availability n. 可用性 - available a. 可用的，有效的 6. f
8、oster vt. 促进 * to foster the development of increasingly complex signal processing algorithms 译： 促进了日益复杂和巧妙的信号处理算法的发展 7. promise v. 许诺，承诺 implementation n. 实施 * Recent advances in integrated circuit technology promise economical implementations of very complex digital signal processing systems. 译：近年
9、来，集成电路技术的发展，使比较经济地实现复杂的数字信号处理系统成为可能。,8.explicit adj. 详述的，明确的 9.sophisticated adj. 复杂的 * increasingly sophisticated signal processing algorithms 译： 日益复杂的信号处理算法 10. spectrum n. 频谱 * An example of a class of algorithms of this type was the set of techniques referred to as spectrum analysis. 译：例如有关频谱分析的
10、技术就是这些算法中的一种。 11.demonstrate vt. 证明 * It had been clearly demonstrated on digital computers that 译：在数字计算机上已经清楚地证明 ,12. interaction n. 互动 - “inter-”: 在之间 13. disclosure n. 公布，出现 14. implication n. 含义 15. inherently adv. 天性的，固有的 *Another important implication of the fast Fourier transform algorithm wa
11、s tied to the fact that it was an inherently discrete-time concept. 译：快速傅里叶变换的另一个重要含义是它和离散时域概念联系起来。 16. stimulate vt. 促进 17. reformulation n. 再形成 - “re-”: 再，又 18. advent n. 出现，到来 *with the advent of large scale integration 随着大规模集成的出现,Expressions:,be concerned with 涉及 transforminto 将转换成 be referred t
12、o as 被称作 in terms of 根据 with the advent of 随着的出现,Text,Unit 18 DSP (Digital Signal Processing) Digital signal processing is concerned with the representation of signals by sequences of numbers or symbols and the processing of the sequences. The purpose of such processing may be to estimate characteri
13、stic parameters of a signal or to transform a signal into a form which is in some sense more desirable. The classical numerical analysis formulas, such as those designed for interpolation, integration, and differentiation, are certainly digital signal processing algorithms. On the other hand, the av
14、ailability of high speed digital computers has fostered the development of increasingly complex signal processing algorithms, and recent advances in integrated circuit technology promise economical implementations of very complex digital signal processing systems.,译：数字信号处理这一学科主要研究用数字或符号的序列表示信号以及处理这些
15、序列。这样处理的目的可能是估算信号的特征参数，也可能是把信号变换成某种更符合要求的形式。经典的数值分析公式，如为内插、积分和微分而设计的公式应该属于数字信号处理算法，另一方面，高速数字计算机的出现，促进了日益复杂和巧妙的信号处理算法的发展。同时集成电路技术近年来的发展，使比较经济地实现复杂的数字信号处理系统成为可能。,Text,Unit 18 DSP (Digital Signal Processing) The goal of DSP is usually to measure, filter and/or compress continuous real-world analog sign
16、als. The first step is usually to convert the signal from an analog to a digital form, by sampling it using an analog-to-digital converter (ADC), which turns the analog signal into a stream of numbers. However, often, the required output signal is another analog output signal, which requires a digital-to-analog converter
