摘要
琴类乐器各个弦或键会偏离应有的位置,需要经常对这些乐器进行校准,如果手工调试势必有一定误差而且不方便。由于不同声音通过不同频率表现,本校音系统通过麦克风采集琴音数据,然后用PIC单片机自带的模数(A/D)转换器对采集的琴音进行模数转换,并对转换后的数据进行快速傅里叶变换(FFT)来分析频谱。另外,为了提高琴音校准系统的准确性和稳定性,电路设计中采用了特殊的放大器对信号采集过程中的噪声进行了抑制。
Each string or key of piano instruments might shift away from the should-be place,so it is necessary to calibrate these instruments.However,manual debugging is not convenient and inevitably has certain errors.For different frequencies of the different sounds,this sound adjusting system,through a microphone,collects piano sound data,and then implements analog-digital conversion on the collected data with ADC Cabasa in PIC microcontroller.Fast Fourier transform（FFT） is done on the converted data for spectrum analysis.In addition,in order to improve accuracy and stability of piano tone calibration system,a specific amplifier is adopted in the circuit design for signal noise suppression in signal the acquisition process.
出处
《通信技术》
2012年第4期40-42,共3页
Communications Technology
