CAJ | 학술논문

为了改善扬声器的频率响应，生成稳定、可重复的宽带脉冲声信号，提出了基于时域逆滤波的宽带脉冲波生成技术。首先利用最长序列（MLS）测量扬声器的单位冲激响应，然后设计基于最小二乘（LS）准则和最小均方误差（MMSE）准则下的 FIR 逆滤波器，最后将信号分别经过 FIR 逆滤波器预处理，再次通过扬声器激励，生成了理想的巴特沃斯宽带脉冲信号。实验证明2种逆滤波算法行之有效，可以用于生成声学测试需要的宽带脉冲声，为实现声学性能现场测量提供了一种解决方案。
위료개선양성기적빈솔향응，생성은정、가중복적관대맥충성신호，제출료기우시역역려파적관대맥충파생성기술。수선이용최장서렬（MLS）측량양성기적단위충격향응，연후설계기우최소이승（LS）준칙화최소균방오차（MMSE）준칙하적 FIR 역려파기，최후장신호분별경과 FIR 역려파기예처리，재차통과양성기격려，생성료이상적파특옥사관대맥충신호。실험증명2충역려파산법행지유효，가이용우생성성학측시수요적관대맥충성，위실현성학성능현장측량제공료일충해결방안。
In order to improve the frequency response of loudspeaker and generate a stable and repeatable broad?band pulse sound, a new technique of pulse sound generation based on time?domain inverse filter is proposed. First?ly, Maximum Length Sequence (MLS) is utilized to measure the impulse response of the loudspeaker. Then, an in?verse filter is designed with Least Squares (LS) rule and Minimum Mean Square Error (MMSE) rule respectively. Finally, by exciting the loudspeaker with pre?filtered voltage signal, the desired Butterworth pulse sound can be produced successfully. Experimental results and their analysis show preliminarily that both inverse filter methods are effective, which can be applied in pulse sound generation and provide a solution to real?time online acoustic meas?urement in the field.