基于MSP430F1611单片机的音频信号分析  

Analysis of the audio signal based on MSP430F1611

作　　者：李侠[1] 周立文[1] 李丹[2] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054 [2]复旦大学专用集成电路与系统国家重点实验室,上海201203

出　　处：《电子设计工程》2011年第4期88-91,共4页Electronic Design Engineering

摘　　要：为了使音频信号分析仪小巧可靠,成本低廉,设计了以2片MSP430F1611单片机为核心的系统。该系统将音频信号送入八阶巴特沃兹低通滤波器,对信号进行限幅放大、衰减、电平位移、缓冲,并利用一单片机负责对前级处理后的模拟信号进行采样,将采集得到的音频信号进行4 096点基2的FFT计算,并对信号加窗函数提高分辨率,另一单片机负责对信号的分析及控制显示设备。此设计精确的测量了音频信号的功率谱、周期性、失真度指标,达到较高的频率分辨率,并能将测量结果通过红外遥控器显示在液晶屏上。To make the audio signal analyzer cheaper, smaller and more reliable, this system sends the audio signal to the eight-order butterworth filter, and then amplifies, attenuates, buffers it in a limiting range, transfers the voltage level of the signal before utilizing two MSP430F1611 MCU to realize the audio analysis. One is charged for sampling and dealing with the processed audio signal collected by the 4096 point radix-2 FFF calculation and imposes the window function to improve the frequency resolution. The other one controls the display and realizes the spectrum, periodicity, power distortion analysis in high resolution which is displayed in the LCD screen through the infrared remote control.

关 键 词：MSP430F1611 FFT 窗函数 频率分辨率 周期性 失真度 功率谱 

分 类 号：TP216.3[自动化与计算机技术—检测技术与自动化装置]