Research on an improved amplitude modulation method of audio directional loudspeaker
Research on an improved amplitude modulation method of audio directional loudspeaker
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一种改进的音频定向扬声器调幅方法的研究
DOI：
10.1109/icalip.2008.4589991
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Jian Ma
中科院分区：
文献类型：
--
作者：
Min Chen;Leon Xu;Yang Cao;Li;Xia Wang;Xuesheng Li;Jian Ma
针对音频定向扬声器中采用的DSB（双边带）方法的谐波失真问题，研究了一种改进的幅度调制（AM）方法。根据参量声阵原理和自解调理论，建立了改进AM方法的理论自解调模型，得出改进AM方法中的变分相位几乎不影响第二压力的结论。此外，对改进的AM方法的谐波失真进行了理论分析并通过实验进行了测试，结果表明，在调制因子相同的情况下，改进的AM方法的总谐波失真远小于DSB方法。然而，改进的AM方法只有在调制因数较小时才能合理应用，因为当调制因数较高时其总谐波失真非常显着。
Aimed at solving the harmonic distortion problem of the DSB (Double Side Band) method which is employed in audio directional loudspeaker, an improved amplitude modulation (AM) method is investigated. According to the parametric acoustic array principle and self-demodulation theory, the theoretical self-demodulation model of the improved AM method is established, and a conclusion that the variational phase in the improved AM method hardly affects the second pressure is drawn. Furthermore, the harmonic distortion of the improved AM method is analyzed theoretically and tested by experiments, and the results show that the improved AM method has a far smaller total harmonic distortion than the DSB method when their modulation factors are equal. However, the improved AM method can only be applied reasonably when the modulation factor is small, because its total harmonic distortion is notable when the modulation factor is high.