扬声器的互调失真测试分析探究

Analysis and Exploration of Intermodulation Distortion Test of Loudspeaker

以扬声器的互调失真为研究对象,阐述Klippel和Soundcheck这两种测试仪对于互调失真的测试参数设置。将扬声器置于自由场环境中,使用相同的功率放大器和测试线路,馈以双音正弦激励信号,使用两种测试仪器测得的二阶与三阶互调失真存在差异。分析得出,测试结果差异是由于测试仪器软件内置计算公式差异所致。

Taking the intermodulation distortion of loudspeaker as the research object, this paper expounds the test parameter setting of Klippel and Soundcheck. The loudspeaker is placed in the free field environment, the same power amplifier and test circuit are used,and the dual tone sinusoidal excitation signal is fed. The second-order and third-order intermodulation distortion measured by the two test instruments are different. The analysis shows that the difference of test results is due to the difference of built-in calculation formula of test instrument software.