摘要
在音频频率电平指示器中,采用OP07构成输入放大电路,对输入或采样的音频信号进行放大,放大后的音频信号经10频段音频带通滤波器在50 Hz～10 kHz内进行分频,各频段所得信号经放大后独立控制一组10LED灯,以每频段灯亮的数目来表示该频段信号的强弱。经测试,该系统10频段分频准确,所控制的LED灯亮数目和亮度符合设计要求。
The system uses the input amplifier composed by OP07 to amplify the input audio signal, and then the audio signal will be divided to ten band frequency by ten band-pass filters within 50Hz-10 KHz. The signal after each band-pass filter will control a group of LED independently, and the LED number of each band represents the amplitude of the signal. The test results show that the number and brightness of the LED lights controlled by ten band frequeney is accurate and can meet the design requirements.
出处
《南通职业大学学报》
2011年第4期101-104,共4页
Journal of Nantong Vocational University
基金
江苏省"青蓝工程"工程项目(苏教师[2008]30号)
苏州市职业大学校级项目(SZD09L24)
关键词
音频频率
电平
实时显示
带通滤波
LM3915
audio frequency
scale of frequency
real-time indication
band-pass filter
LM3915
