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一、引言组合扬声器(箱)测量时,如何确定测试参考点,参考轴及测量距离,是很重要的。所谓参考点,就是测量时测试传声器对准被测组合扬声器(箱)平面的那一点。参考轴是通过参考点垂直于辐射平面的一条直线。沿参考轴从参考点到测试传声器的距离,就是测量距离。组合扬声器(箱)是由多只扬声器单元组合而成的,其辐射声场比单只扬声器辐射声场要复杂得多。因而在测量工作中就不能简单地仿照测量单只扬声器那样进行了。应如何正确的 相似文献
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针对混响室低频混响时间测量的偏差大这一问题,提出对随机噪声信号进行限幅或改用一系列单频信号发生器作稳定激发可显著改善测量结果的偏差。 相似文献
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In this paper,theoretical and experimental results for study of the acoustical mechanism ofthe active sound absorber are presented.Several conclusions have been drawn: (1)When the secondary source system is a unidirectional source,all the energy in the in-cident wave will be absorbed by the secondary source system with no energy reflection. (2)The energy absorbed by the secondary source system is lost in heat in the loudspeakercoils. (3)The process of energy absorption may be described as follows:the incident energy is partlyabsorbed by source Ⅰ in the secondary source system,the transmiting energy will be reflected backby source Ⅱ in the secondary source system and absorbed finally by source Ⅰ. 相似文献
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