人类除了时刻离不开空气外，另一个时刻离不开(并且是想离也离不开)的东西大概就是声音了。不是吗?我们可以闭上眼睛而看不见，却不能闭上耳朵而听不见。在我们赖以生存的这个世界上，也没有绝对无声的地方，这说明了声音对人类的重要性。正因为如此，追求优美的声音，消除有害的声音，就成了人们始终在努力实现的目标。
In addition to the human time cannot do without air, another moment cannot do without (and want to leave also cannot do without) is probably the sound of something. Not? We can close your eyes and do not see, but not close ear and hear. The world in which we live on, there is no absolute silent place, it shows the importance of the human voice. Because of this, the pursuit of beautiful voice, the elimination of harmful sound, became people always trying to achieve the goal of.
室内的一些声学现象
Some indoor acoustic phenomenon
每个人的一生中至少有1/3到1/2的时间是在房间内渡过的，听音乐则更是如此。因此室内的声学现象必然引起人们的关注。
Each person's life is at least 1/3 to 1/2 of the time is spent in the room, listen to music is even more so. Therefore the indoor acoustic phenomenon must cause the attention of people.
如同镜子会反射光线一样，房屋的墙壁、地板、天花板都会对声音产生反射，可惜的是声波并不能被看到，这种现象就往往被忽视了。其实呢，声音的反射现象是非常普遍的和有趣的(如北京天坛的回音壁)。从房屋内某一处发出的声音，都会以波的形式传播，并且从无数条途径到达听音位置。实际的反射现象是非常复杂的，并且随着房屋的形状及室内物体的不同而千差万别，相信这是不难想像和理解的。
A mirror reflects the light, walls, floor, ceiling, housing will have a reflection of sound, it is a pity that the sound waves and can't be seen, this phenomenon is often overlooked. In fact, the sound reflection phenomenon is very common and interesting (such as the Tiantan Beijing echo wall). From the sound of a place to send out to the inside of the housing, will be to spread the wave form, and from the numerous ways to reach the listening position. The actual reflection phenomenon is very complicated, and with the object shape and indoor housing is different and differ in thousands of ways, I believe it is not difficult to imagine and understand.
由于反射现象的存在，在听音位置，我们实际听到的并不是纯粹由音箱发出的声音，而是济南音响 http://www.jnzqyx.com/ 的直达声和各次反射声叠加后的效果。那么，这种叠加后的效果究竟是怎样的呢?“混响时间”这个概念是比较常用和重要的，它是指在直达声之后，声波在不断反射中能量逐渐减小的时间过程。这里“混”字的应用非常形象，因为在室内某处听到的声音总不是单一的，而是从各个方向来的、混乱不堪的。通常就把反射声统称作混响声(或者再细分为早期反射声和混响声)。关于混响时间的概念，声学上有它准确的定义，是指声源停止发声后残余声能密度下降为原值百万分之一时所经过的时间。值得指出的是用它可以描述声音的清晰度、丰满度，一般来说混响时间短则声音清晰度好，混响时间长则声音丰满度好。
Because of the existence of the phenomenon of reflection, in the listening position, we actually hear is not purely by speaker sound, but the sound of Ji'nan direct sound and reflected sound each time after the superposition effect. So, whether the superimposed effect how? "The reverberation time" this concept is relatively common and important, it refers to the direct sound, acoustic energy in constant reflection gradually decreasing in time process. Application of this "mixed" very image, because the total sound heard indoors somewhere is not single, but from all directions, chaos. Usually the reflected sound system called the reverberation sound (or subdivided into early reflected sound and reverberation sound). About the concept of reverberation time, defined it accurate acoustic, refers to the original value of the sound source to stop after one millionth time decreased when residual sound energy density of vocal. It is worth pointing out that it can be used to describe the sound definition, fullness, generally reverberation time is short sound good definition, reverberation time long the fullness of sound good.
下面再介绍另一个与反射有关的现象，即被称作房间内“简正激发”、“共振”、“共鸣”的声学现象。这指的是房间因其几何尺度而对某些频率的声波特别优惠，予以加强(形成驻波)的现象，这也是普遍存在的现象。对于通常的家庭居室来说，这种共振的基频频率是在低音区，约在100Hz以内。
Again below another and reflection about the phenomenon, known as the room "Jane is inspiring", "resonance", "resonance" acoustic phenomenon. This refers to the room because of its geometric dimensions and on some frequency sound waves to special offers, to strengthen (standing waves) phenomenon, which is a common phenomenon. The family room generally speaking, fundamental frequency of this resonance is in the bass, less than 100Hz.
假如房间不能吸声
If the room is not sound
我们可以从上述声学现象出发来想像一下，如果房间内没有吸声物，房间本身也不吸收声音，将会是怎样一种情景。那时声音一旦发出就会不停地反射下去，前后发出的声音都将混叠在一起。例如，在这样的房间内播放语言广播，第二个字音出现的时候第一个字音仍在响，第三个字音出现的时候前两字音仍同时在响……再加上会激发出不同频率的共鸣音，则无论是语言或音乐我们都将完全无法分辨(除了第一个音)，更不用说去欣赏了，听到的只能是一片噪音!读者如果有兴趣，也可以这样来模拟一下：找来一台复音电子琴(复音数越多越好)，顺次压下它的键不要放手，听一听从乐音到噪音的转变。当然这些只是在一种极端情况下的想像。实际上由于墙壁、空气、人体都会吸收声能，反射声总是要逐渐消失的。不过通过这样的想像，可以使我们进一步理解房间吸声的重要性。幸亏我们并没有生活在完全不吸声的环境中，否则真是不堪设想!
We can from the acoustic phenomena to imagine, if there is no sound absorption material inside the room, the room itself does not absorb sound, what will be a kind of scene. Then the sound once issued will be continually reflected down, before and after the voice will be mixed together. For example, play language radio in this room, second word appears when the first word is still ringing, when the third phoneme occur before the two pronunciation still also in the ring...... Plus will inspire resonance sound of different frequencies, then both the language or music we all will be completely unable to distinguish (except the first sound), not to mention to appreciate, hear is only a noise! If readers are interested, you can also simulate a: find a polyphonic electronic Qin (polyphony as possible), press keys don't it in order to let go, listen to music to change from noise. Of course, these are only in an extreme case of the imagination. In fact, because of the wall, the air, the body will absorb sound and reflected sound always disappearing. But through this imagination, so that we can further understand the importance of room sound absorption. Fortunately, we do not live in the completely acoustic environment, otherwise is really unthinkable!
尽管现实中的房间都可以吸收一些声能，但是往往很不理想。如果我们购买了很好的音响设备，它们发出了高保真的声音，可由于听音的房间吸声特性不好，不该有的混响和共鸣使原有的声音受到严重扭曲，那是何等遗憾!因此，真正的高保真放音的追求者，应当也是房间合理吸声的追求者。
Despite the reality of the room can absorb some energy, but it is often not ideal. If we buy a good audio equipment, they produced high fidelity sound can be due to listen to the room sound absorption characteristics of sound is not good, not some of the reverberation and resonance makes the original sound is severely distorted, what a pity! Therefore, hi fi playback real pursuit, should also be reasonable room sound-absorbing pursuit'.