声学软件Odeon中声线数对声源指向性的影响

Effect of the ray number on the directivity of the source in acoustic software Odeon

使用声学软件Odeon对演播厅堂模型仿真,得到厅堂中18个受声点的声压级,并通过各点声压级比较声场的均匀性。通过探索Odeon中不同的声线数对声源指向性的影响,得出了声线数对于指向性声源的影响存在一个阈值:小于100条声线可以较好地体现出声源的指向性;100～500条声线声源的指向性变得较为模糊;500条以上声线数声源近似为无指向性,声场的均匀性较好。

In this paper,the sound pressure levels (SPLs) at 18 receiving points in an auditorium are obtained by the simulation using acoustic software 'Odeon'.According to comparison of sound field uniformity,the effect of ray number on the directivity of the source is explored.It is shown that for the effect on directional source,a threshold of ray number exists: for less than 100 rays,the directivity of the source can be better revealed;for the ray number between 100 and 500,the directivity is vague;for more than 500 rays,the sound field has good uniformity,so the source is similar to an omnidirectional one.