室内声学测量中扬声器瞬态响应的影响及消除

采用数字化球面声源进行测量并运用相关技术进行分析 ,得出房间内实测声压信号与扬声器的激发电压信号间的互相关函数为扬声器与房间相应的脉冲响应函数的卷积 .阐明了扬声器脉冲响应函数在消声室与在现场条件下的测量方法 ,借助反卷积技术消去扬声器响应的影响可获得精确的房间脉冲响应函数 .测量结果表明此方法具有可靠性与可操作性 ,具有在声学测量技术中推广应用的前景 .

Influence of Loudspeaker Impulse Response and Its Elimination in Room Acoustical Measurement

Through the measurement with omi-directional loudspeaker driven by digital signals and analyses with the correlation technique,it turns out that the correlation function between sound pressure signals measured in the room and electrical signal imported to the speaker is equal to the convolution between the loudspeaker and room impulse response.The measurement method of loudspeaker response in anechoic room or in situ is presented.The accurate room impulse response can be obtained by elimination of loudspeaker response with the decorrelation technique.The results show that this method has the reliability,availability and prospects of being applied in the acoustical measurement.