电子专业英语Lesson-19-High-Fidelity-Audio课件

Unit 7 Audio&SpeechLesson 19 High Fidelity Audio电子信息工程专业英语教程任治刚 主编电子工业出版社电子工业出版社 7/9/20241电子信息工程专业英语教程Lesson 19 High Fidelity Audio BackgroundsText tour Language in useVocabulary Structure Reading/writing techniques7/9/20242电子信息工程专业英语教程Terminology Audiophile高保真音响爱好者Hearing听力，听觉Microscope显微镜Phonograph留声机Backgrounds7/9/20243电子信息工程专业英语教程Terminology Rpm:revolutions per minute转数分scanning velocity扫描速度Playback录音重放feature size特征尺寸Backgrounds7/9/20244电子信息工程专业英语教程Terminology block diagram框图look-up table查找表Reed-Solomon coding里德-索罗蒙编码Backgrounds7/9/20245电子信息工程专业英语教程Terminology Bessel filter贝塞耳滤波器sin(x)/x correctionsin(x)/x校正Backgrounds7/9/20246电子信息工程专业英语教程Text tour Outline Introduction(para.1)CD playback system(para.2-8)Stereo(para.9,10)7/9/20247电子信息工程专业英语教程IntroductionDigital audio was brought to the world by the compact laser disc,or CD.This was a revolution in music;the sound quality of the CD system far exceeds older systems,such as records and tapes.7/9/20248电子信息工程专业英语教程CD playback system the surface of a compact laser disc the digital information stored as a series of dark pits burned on the surface with a laser During playback,an optical sensor detects if the surface is reflective or nonreflective,generating the corresponding binary information.7/9/20249电子信息工程专业英语教程CD playback system EFMtwo-level Reed-Solomon coding multirate technique 7/9/202410电子信息工程专业英语教程CD playback system Figure 7.1 The surface of a compact disc7/9/202411电子信息工程专业英语教程CD playback system Figure 7.2 The block diagram of a typical CD playback system7/9/202412电子信息工程专业英语教程StereoAudio systems with more than one channel are said to be in stereo The four channel sound used in motion pictures is called Dolby Stereo,with the home version called Dolby Surround Pro Logic.7/9/202413电子信息工程专业英语教程StereoFigure 7.3 Two-channel Dolby Stereo(left)and 5.1-channel Dolby Pro Logic II(right)7/9/202414电子信息工程专业英语教程Vocabulary Feature comply artificial reproduce secondaryStructureReading/writing techniquesLanguage in use7/9/202415电子信息工程专业英语教程Vocabulary7/9/202416电子信息工程专业英语教程Feature in dictionaryAny of the distinct parts of the face,as the eyes,nose,or mouth.面貌特征A prominent or distinctive aspect,quality,or characteristic 特征a feature of ones personality;a feature of the landscape.The main film presentation at a theater.正片A special attraction at an entertainment.特别节目A prominent or special article,story,or department in a newspaper or periodical.特写An item advertised or offered as particularly attractive or as an inducement 特色a washing machine with many features.7/9/202417电子信息工程专业英语教程Feature in dictionaryTo give special attention to;display,publicize,or make prominent.展示To have or include as a prominent part or characteristic:由主演The play featured two well-known actors.To depict or outline the features of.刻画7/9/202418电子信息工程专业英语教程Feature in textAs shown by the geometry in Fig.7.1,the CD stores about 1 bit per(m)2,corresponding to 1 million bits per(mm)2,and 15 billion bits per disk.This is about the same feature size used in integrated circuit manufacturing,and for a good reason.从图7-1显示的几何尺寸可以看出，CD每平方微米存储1位信息（相当于每平方毫米1百万位），共存储1.5亿位信息。这个尺寸（1平方微米）和集成电路制造中的特征尺寸大致是相同的。7/9/202419电子信息工程专业英语教程Feature in use acoustic feature声学特征age feature年龄特征design feature设计特点7/9/202420电子信息工程专业英语教程Comply in dictionaryTo act in accordance with anothers command,request,rule,or wish:遵从The patient complied with the physicians orders.7/9/202421电子信息工程专业英语教程Comply in textThis has the advantage of reducing the error rate due to the optical pickup,but how do you force the binary data to comply with this strange bunching?这样做的好处是降低了光学读取造成的错误率。但是，如何让二进制数值遵循这种奇怪的安排？7/9/202422电子信息工程专业英语教程Artificial in dictionaryMade by human beings;produced rather than natural.人工的Brought about or caused by sociopolitical or other human-generated forces or influences:人为的an artificial economic boom.Made in imitation of something natural;simulated.模拟的Not genuine or natural:假的an artificial smile.7/9/202423电子信息工程专业英语教程Artificial in textMusic played through a monaural(one channel)system often sounds artificial and bland.In comparison,a good stereo reproduction makes the listener feel as if the musicians are only a few feet away.单声道系统播放出来的音乐往往听上去生硬而又平淡。相比之下，一个好的立体声音响系统会使听者感到似乎演奏家们只有几步之遥。7/9/202424电子信息工程专业英语教程Reproduce in dictionaryTo produce a counterpart,an image,or a copy of.复制 To generate(offspring)by sexual or asexual means.生殖To produce again or anew;re-create.再生产To bring(a memory,for example)to mind again.重现7/9/202425电子信息工程专业英语教程Reproduce in textRather than just matching the abilities of the human ear,these systems are designed to exceed the limits of hearing.Its the only way to be sure that the reproduced music is pristine.这些系统不是设计得刚好满足人类的听觉需求，而是超越了人类听觉的极限。这是唯一能够确保再现音乐无任何失真的方法。7/9/202426电子信息工程专业英语教程Reproduce in use accurate colour reproduction 精确彩色重现data reproduction 数据复制frequency reproduction 频率再生hi-fi reproduction 高保真重放image reproduction 图象再现multichannel reproduction 多声道放音signal reproduction 信号再生7/9/202427电子信息工程专业英语教程Secondary in dictionaryOf the second rank;not primary.第二的；不是主要的Inferior.低等的Minor;lesser.不重要的；次要的Derived from what is primary or original:间接的a secondary source;a secondary infection.7/9/202428电子信息工程专业英语教程Secondary in dictionaryHaving an induced current that is generated by an inductively coupled primary.Used of a circuit or coil.产生感应电流的Of or relating to a secondary school:中学的secondary education.7/9/202429电子信息工程专业英语教程Secondary in textAudiophiles demand the utmost sound quality,and all other factors are treated as secondary.高保真音响爱好者对声音质量要求极高，而把除此以外所有其他因素都视作第二位。7/9/202430电子信息工程专业英语教程Secondary in use secondary education中等教育secondary product副产品a secondary cause次要原因secondary infection继发感染7/9/202431电子信息工程专业英语教程Structure7/9/202432电子信息工程专业英语教程p经常不断地学习,你就什么都知道。你知道得越多,你就越有力量pStudyConstantly,AndYouWillKnowEverything.TheMoreYouKnow,TheMorePowerfulYouWillBe写在最后谢谢你的到来学习并没有结束，希望大家继续努力Learning Is Not Over.I Hope You Will Continue To Work Hard演讲人：XXXXXX 时 间：XX年XX月XX日