混响室内声源的声功率输出及声强分布

SOUND INTENSITY DISTRIBUTION AND ACOUSTIC POWER OUTPUT OF A SOUND SOURCE IN REVERBERATION CHAMBER

摘要: 本文讨论了混响室内的声强分布,指出混响室内声强分布与自由场一样,对点声源服从平方反比律。对混响室及消声室的声压及声强随时间的起伏作了初步摸索,得到了几条实验规律,指出声强起伏比声压起伏更大。采用声强测量方法对同-声源在消声室及混响室内的声功率输出作了测量,说明声源的声功率输出是随环境变化的声学量,在混响室内声源的低频发射要比消声室内的发射要低。

Abstract: The sound power measurements using sound intensity measuring indicated that the emission of sound source varied in different acoustic environments,the low frequency output of a sound source in reverberation chamber is Lower than that in anechoic room.The direct sound from a source was measured by mesuring the sound intensity in a reverberation chamber.There are some phenomena showing the differences between sound pressure and intensity both in anechoic room and reverberation chamber.