摘要从21世纪开始，电子产品发展迅速，电子产品的产生为人们的生产生活带来了极大的方便。同时人们对电子产品的性能及稳定性有了更多的要求，各大生产商也必须研制出性能更好，系统更稳定的产品才会有更大的市场，被用户接受。自从扬声器的出现到现在已经有一百年左右的时间。国内扬声器的发展也有了半个多世纪的历程，扬声器在我们生活中随处可见，扬声器的应用特别广，比如车载音响，手机，电脑，电视等等。扬声器生产线上，为了保证扬声器的出厂质量以及提高产品合格率，电声厂家需要对扬声器各项参数进行评估测量，要对扬声器的低频特征频率F0进行测试。46505
本课题介绍了扬声器的选题意义、当前背景、以及各个参数，并提出了扬声器的低频特征频率这一项重要参数，并且设计了测试扬声器低频特性频率设备。在二零零二年，我的毕业论文指导老师发明了快速测量扬声器的谐振频率设备，并且申请了专利，它把滤波器、单片机的输出连接到DDS信号发生器的输出，增益控制器的输出端接到功率放大器的输入端，将低通滤波器和单片机的输出接增益控制器的输入，把扬声器连接到功率放大器的输出，单片机的信号输入端接电流响应值相位取样电路的输出端，就可以快速的完成对扬声器谐振频率的测试.
本课题以C8051F005单片机为核心设计了一款基于单片机的扬声器低频频率分析系统。该系统采用模拟信号输入,经AD,数据采集,频谱分析，最终在液晶屏上画波形曲线，显示分析数据,完成示波器功能。
毕业论文关键词：扬声器；低频特性频率；DDS；c8051f005；
Abstract  Rapidly from the beginning of the 21st century, electronic product development, production of electronic products for people's production and life brought great convenience.People at the same time to the electronic product performance and stability have more requirements, each big manufacturer must also be developed better, more stable system of product will have a larger market, accepted by the user.Since the advent of speakers to now has one hundred years or so.The development of domestic speakers also had more than half a century of existence, the speaker can be seen everywhere in our life, the speaker's special widely used, such as car audio, mobile phone, computer, TV and so on.Speaker production line, in order to ensure the quality of the speaker to factory and improve the product percent of pass, electroacoustic manufacturers need to evaluate the speaker parameters measurement, to be on the low frequency characteristics of the speaker frequency F0 for testing.
  various parameters, and put forward the speaker of the low frequency characteristic frequency is one of the most important parameters, this equipment and design the test speaker of low frequency.At the same time, combining with the domestic and international authoritative institutions issued by the industrial test standard, detailed elaborated on the low frequency, in 2002, my graduation thesis guidance teacher invented fast measuring the resonance frequency of the loudspeaker equipment, and applied for a patent, it connects filter, the output of the single chip microcomputer to the output of DDS signal generator, the output of the gain controller receives the input end of the power amplifier, low pass filter and the output of the microcontroller gain controller input, the speaker connected to the output of the power amplifier, signal input terminal current response of the single chip microcomputer phase sampling circuit of the output value, can quickly complete a test to the resonance frequency of the speaker.
  This topic with C8051F005 MCU as the core has designed a speaker low frequency analysis system based on MCU.This system adopts analog signal input, through the AD, data acquisition, spectrum analysis, the final draw waveform curve on the LCD panel, according to analysis of data, complete the oscilloscope function. C8051F005单片机扬声器系统测量软件部分设计:http://www.751com.cn/zidonghua/lunwen_48226.html