用Butterworth脉冲测量扬声器的频率频响特性

Measurement of the Fequency Response of a Loudspeaker Using Butterworth Impulse

扬声器的频率响应是描述扬声器电声特性的重要参量。脉冲法一次性可以测得较宽频带的频率响应,而且适用于非消声室环境,但脉冲信号质量会影响测量精度。为此,提出了利用Butterworth滤波器响应作为扬声器驱动信号在半消声室和普通房间测量了Hi-WiS6.5R扬声器的频响特性,并和单频测试结果进行了对比,二者吻合良好。

The frequency response is an important parameter which describes the electroacoustical characteristic of a loudspeaker. The impulse FFT technique is one of the methods which can be used to measure the loud- speaker responses with broad band in an ordinary room. Actually, the quality of impulse will affect the measure- ment precision. The signal of Butterworth function is used as the driving signal and the frequency response of a Hi-Wi loudspeaker is measured in a semi-anechoic room and an ordinary room. The results agree well with that measured by the single-frequency technique.