Room acoustics

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Room acoustics describes how sound behaves in an enclosed space.

The way that sound behaves in a room can be broken up into roughly four different frequency zones:

• The first zone is below the frequency that has a wavelength of twice the longest length of the room. In this zone sound behaves very much like changes in static air pressure.
• Above that zone, until the frequency is approximately 11,250(RT60/V)^1/2, wavelengths are comparable to the dimensions of the room, and so room resonances dominate.
• The third region which extends approximately 2 octaves is a transition to the fourth zone.
• In the fourth zone, sounds behave like rays of light bouncing around the room.

在米制中,11250应为2000.

关于这个问题,记得水仙和初哥早已讨论和回答过了.

我在这儿贴上WIKI的一段,要义是什么呢?

一个封闭空间(腔体或房间)里的声波会怎么样表现呢?

是分四个频率区:

声波波长大于房间最长尺度的两倍(?)的低频区,声音大致按静态压强的规律变化,即所谓是声压场.

从低频到那个界限频率 2000(RT60/V)^1/2
的这个频域,声波波长是和房间的尺度相比较了,房间内的谐振起主导.

从上述那个界线频率到它的四倍(注意这个四是和WIKI中的二有所差别,引用自另一文献)这段频域,称之为过度区.

频率高过上述那个界线频率的四倍的频域,声波就像光线那样来回反射了,这是第四频域.

注意在第一区和第二区,是房间的简正振动方式为主.

在第三区和第四区,混响是可能的.

"318耳的结构是属于什么样的声场？"

说明书里讲了的吧.

或者,根据它的内尺寸,和声波波长比一比,再参考上面的引文,
就能得到答案了吧.

"扩散场和声压场有哪些差别？"

还是找水仙和初哥的有关帖子看看.