|
所在平台: Udemy |
课程主页: https://www.udemy.com/course/acoustics-201-loudspeaker-measurements/
课程评论：没有评论
**Coursera课程：声学 201：扬声器测量** 本课程旨在教授学员如何进行准确的扬声器测量，即使在没有专业消声室的普通环境中也能获得无响特性（anechoic response）。 **主要学习内容：** * **频响测量 (Frequency Response Measurement):** * 学习测量单个扬声器单元、整体扬声器系统或音响系统的频响曲线。 * 掌握在家庭环境中复现无响室测量效果的技巧。 * 学会利用测量数据优化音响系统设置。 * 为DIY扬声器设计分频器提供测量依据。 * **电气工程基础 (Basic Electrical Engineering):** * 理解音响系统中的声学与电气组件的联系。 * 学习测量阻抗并绘制阻抗曲线。 * 测量电容、电感、电阻等电子元件的特性。 * 掌握测量未知扬声器单元的 Thiele/Small 参数（T/S 参数）的方法。 * **分频器设计入门 (Introduction to Crossover Design):** * 不直接教授分频器设计，但会指导如何生成用于分频器设计软件的 FRD (Frequency Response Data) 和 ZMA (Impedance Data) 文件。 * 演示如何将这些文件加载到分频器设计软件中，并实验不同分频器电路的性能。 **所需设备：** * **测量麦克风:** 推荐 miniDSP UMIK-1。 * **阻抗测量设备:** 推荐 Dayton Audio DATS v2 (或更新的 v3)。 * 课程内会提供更详细的设备清单、替代选项和更经济实惠的方案。 **软件：** * **Room EQ Wizard (REW):** 免费且直观的声学测量软件，用于进行各种声学测量。 * **Excel 电子表格:** 课程提供了一个 Excel 电子表格，用于 REW 缺失的特定功能。 **课程更新:** * 2018年11月: 添加了英文副标题。 * 2019年6月: 修正了三路扬声器测量的误差，并增加了相关信息。 * 2020年1月: 更新了设备清单。
Learn how to measure frequency responseThe first thing you will learn from this course is to measure the frequency response of a certain speaker driver, loudspeaker or sound system. The difficult part is to get an anechoic response without an anechoic chamber. Using different measuring techniques and with the help of intuitive software, you will learn how to measure the full frequency bandwidth anechoically in your own living room. This will help you set up your audio system using measured data, or it can be used to design crossovers for your particular DIY loudspeaker.A little bit of electrical engineeringA sound system is a combination of both acoustical and electrical parts. You will also learn how to measure impedance and create impedance plots. Measure different electrical components like capacitors, inductors and resistors. Also, if you have an unknown speaker driver you will learn how to measure the Thiele / Small parameters without much fuss.Dip your feet into crossover designWhile this course will not teach you how to design a crossover, it will show you how to create FRD and ZMA files. These are frequency response and impedance files which are used in crossover design apps. At the end of the course I will show you how to load these files into such program, and tryout different circuits and see how adding crossover components behave. A comprehensive course about crossovers will be released in the near future.Do I need certain equipment?Yes, you will need 2 core pieces of gear:A measurement microphone (like miniDSP UMIK-1).A device for measuring impedance (like Dayton Audio DATS v2 (recently released v3 as of 2020).These are roughly 100$ each, but you will get a more comprehensive list of the equipment needed inside the course. With alternatives that you can buy, or more cheaper options. Also, some accessories that will make your life easier are included in the list.Software optionFor the different acoustical measurements we are going to use Room EQ Wizard (or REW). This is a free to use software. Usually, acoustics software are quite expensive and difficult to follow. However, REW is free and quite intuitive to use. Pretty much a complete package. It only misses one function, which I consider important. Don't worry, we're are not going to step up to those complicated application. I devised an Excel spreadsheet which handles this shortcoming. You will find the spreadsheet inside the course.Nov 2018 Update - Added English subtitles.June 2019 Update - Corrected a measurement error for the 3-way speaker and added more info to that sectionJan 2020 Update - Update the equipment list
