毕业设计（论文）--复合频率分离计的设计及其应用.docVIP

东北大学秦皇岛分校 毕业设计（论文） 第 PAGE \* MERGEFORMAT 67页 PAGE  复合频率分离计的设计及其应用 摘 要 复合频率分离在理论界又叫做盲信号分离，在生物医学工程、语音增强、数字通信系统等领域有着较广的应用和应用潜力。 本文首先介绍了复合频率分离的背景及其用途。然后，本文介绍了盲信号分离的一般方法，包括一般计算的信号模型假设以及分析过程。作为文章主体部分，本文介绍了一种在一定条件下的分析复合频率分析的方法，即利用如FFT等算法进行计算及其实现。文章主要描述了算法实现的整体框架、设计思路、硬件结构和软件设计。其中，文章还对于 FFT算法的计算和推导过程进行了详细的描述。为了对系统进行优化，文章还对复合频率分离系统的结果进行评测，并对其中的一些问题，如频谱泄露等，提出了加窗函数解决方法。 另外，本文还介绍了频率分离的实际用途，重点介绍了复合频率分离系统在功率因数校正方面的应用，即计算出电流畸变率，以更加方便地对功率因数校正的评测。 关键词：频率分离，FFT，窗函数，功率因数校正 Composite signal separation system and its application Author：Yu Xiang Tutor：Ma Shuhua Abstract Composite frequency separation is part of Blind Signal separation, and it is applied widely in biomedical engineering, speech enhancement, digital communications, and so has broad applications and potential for applications. Briefly, this paper makes an introduction about the background and the applications about composite frequency separation. To make the theories more explicit, the general means of dealing with Blind Signal separation are illustrated. In the main content of the paper, this thesis makes an introduction about a practical method about separating composite frequency, in other words, with the calculation to make the separation being implemented. In this part, this thesis focuses on give a practical way on designing a system, the structure of the hardware and software etc. To get an optimized result, other methods such as the window functions are added. To make more applications of this separation, the implement for power factor correction (PFC) has been introduced in order to give a clearer explanation of our composite frequency separation system. With the results of the application mentioned, the calculation of PFC will become possible. Key Words: frequency separation, FFT, window function, PFC 目 录  TOC \o 1-3 \h \z \u  HYPERLINK \l _Toc296274520 1 绪论  PAGEREF _Toc296274520 \h 1  HYPERLINK \l _Toc296274521 1.1 研究背景及意义  PAGEREF _Toc296274521 \h 1  HYPERLINK \l _Toc29627