摘要
校音器用于识别管弦乐器声音的基音频率和音高。该校音器使用型号为TMS320VC5509A的DSP芯片作数字信号处理,运行8192点快速傅里叶变换算法,实现声音信号频谱分析;利用语音编解码芯片TLV320AIC23将从麦克风获取的模拟信号转化为数字信号,采样率为8 k Hz;该检测仪利用LCD输出频率和音高信息;印刷电路板成品采用4层电路板模式。该检测仪可以有效检测管弦乐器的音域范围为32 Hz^4 k Hz,频谱分辨率达到0.98 Hz。
Tuner is used for identifying fundamental frequency and pitch of orchestral instrument. A TMS320VC5509A DSP chip is used in the tuner for digital signal processing, doing 8192 point FFT algorithm to achieve the sound signal spectrum analysis. A speech codec TLV320AIC23 is used to convert the analog signal from the microphone into digital format, and the sampling rate is 8 kHz. The device has a LCD screen to display frequency and pitch information. The product PCB is 4 layer layout..The device can catch the range of orchestral frequencies from 32 Hz to 4 kHz, and the resolution of spectrum is 0.98 Hz.
出处
《微型机与应用》
2015年第16期30-33,共4页
Microcomputer & Its Applications
