【 Weak current College 】 room decoration ([thirteenth article] to create a good room sound listening environment)---Power By 【 China power house network 】

<br> [chapter XIII] emphasis on creating a good listening room acoustic environment is inseparable from human beings in addition to air time, another time can not be separated (and want to leave can not be separated) is probably the sound of things. .Is not it? We can close your eyes and see, but can not close my ears and hear. .We live in this world, there is no absolute quiet place, which explains the importance of the human voice. .Because of this, the pursuit of beautiful sound, the elimination of harmful sound, it becomes a people always trying to achieve. .Some of the indoor acoustic phenomena in each person's life, at least 1 / 3 to 1 / 2 the time is spent in the room, and listening to music is even more so. .Therefore, the inevitable phenomenon of indoor acoustics cause for concern. .As the mirror will reflect light, like the housing walls, floors, ceilings will have a reflection of sound, sound waves can not be a pity to see that this phenomenon is often ignored. .Actually, the sound reflection phenomenon is very common and interesting (such as the Echo Wall Beijing Temple of Heaven). .From the house at the sound of a will in the form of waves propagation, and the myriad ways to get from listening position. .The reflection phenomenon is actually very complex, and with the house interior object shape and vary different, I believe it is not hard to imagine and understand. .The reflection phenomenon, in the listening position, we actually hear is not only the sound from the speakers, but the speaker's direct sound and reflected sound superposition of various post-effects. .Then, after the effect of this superimposed what is it? "Reverberation time" concept is more common and important, it refers to the direct sound, the sound is constantly reflected in the time course of energy decreases. .This "mixed" is the image of the application of the word, because somewhere in the room heard the sound is not always single, but coming from all directions, chaotic. .Usually referred to as mixed put the sound reflected sound (or further divided into the early reflections and reverberant). .On the concept of reverberation time, acoustic precise definition of it on, is the audible sound source, stop the decline of residual acoustic energy density millionth of the original value when the elapsed time. .It is worth noting that it can be described with the sound clarity, fullness, in general, reverberation time is short, the sound clarity, and reverberation for a long time, the sound fullness. .Next, introduce another phenomenon associated with the reflection of it called the room "Jane is excited," "resonance", "resonance" of the acoustic phenomenon. .This refers to the geometric scale of the room because of the frequency of sound waves on some special offer, be strengthened (the formation of standing wave) phenomenon, which is a common phenomenon. .For the typical family room, this rate is frequently the base resonance in the bass area, about 100Hz or less. .If the room is not sound-absorbing acoustic phenomena that we can proceed from the above to imagine, if the room is not sound-absorbing material, the room itself does not absorb sound, what will be a scene. .Once the issue of time will keep the sound down reflex, before and after the sound will be mixing together. .For example, in this room playing language broadcasting, and the second occurred when the first pronunciation pronunciation is still sound, the first three words before the word sounds when there is still the same time in the ring tone ... ... together with different frequencies will be excited .resonant tone, language or music, whether we will be completely unable to tell (except for the first sound), let alone to enjoy, and to hear only a noise! readers If you are interested, it may be to simulate it: .recruited a keyboard polyphony (polyphony better), sequential reduction of its key not to let go and listen to the noise from the music changes. .Of course, these only in an extreme case of imagination. .In fact the walls, the air, the body will absorb the sound energy, reflected sound is always disappearing. .Through this imagination, however, allows us to further understand the importance of the room acoustic. .Fortunately, we do not live in an environment totally absorbing, or really unthinkable! Although in reality the room can absorb some sound energy, but often far from ideal. .If we buy a good audio equipment, they sent a high-fidelity sound, but because sound absorption properties of the listening room is not good, should not have reverb and resonance to the voice of the original have been seriously distorted, that is how .sorry! Thus, the true high-fidelity playback of the suitors, but also the room should be reasonably sound absorption suitors. .Acoustic environment, if given the opportunity to create a method, it is best to visit to the anechoic chamber, acoustic and other professional recording studio environment, so you can open up our horizons. .Should at least pay attention to acoustic design of movie theaters, or other places, to learn something useful experience. .In principle, if the playback to be truly authentic, it should be free from the interference of reflected sound, just listen to the direct sound. .This requires a completely acoustic environment, which can often be difficult to (expensive anechoic chamber, it is not used), so the room is usually the part of the absorption, retention and use of a number of reflections. .According to the author for some understanding of the family listening environment, most of which did not use sound-absorbing design, although some families have used the expensive equipment and even a fever wire. .Thus, in these families in the pursuit of sound absorption is a small part of the minimum choice, because it is from scratch, you can receive an immediate effect, that is: significantly reduced low-frequency roar, and make sound becomes .more clear and melodious. .Has been used for a small amount of absorption of the family, you may wish to most of the absorption and balanced acoustic efforts to make high-fidelity equipment closer to the scene to re-release the sound. .Can refer to the books, the use of engineering calculation approach to acoustic design. .Average family size is not large listening room, the design would be appropriate to control the reverberation time in 0  6 seconds or less, the smaller the better, this calculation and select the appropriate sound-absorbing material. .Because does not require very accurate, or can be roughly estimated. .Photos is the author of Under the formula, according to a small listening room is about 15m2 area calculated reverberation time - the average absorption system curve, for reference use. .According to the author's experience and feelings, that the absorption material is usually always room to worry about the more Zhichou the less, so in general, do not you make calculations, the following about this treatment method is not quantitative absorption .. .First look at the ground, bad ground will make the bass reflex is too strong, if the listening room room has wooden flooring, it is ideal, and its absorption characteristics is uniform. .If it is a hard ground to be covered with thick carpet. .To facilitate the move, the carpet area can be limited to between the speakers and listening position, the key is to have a thickness, can draw in its Xiadian cardboard, wood, fiberboard, etc. to achieve. .Ceiling and four wall panels with different specifications of the perforated sound-absorbing materials to decorate. .Together with a small amount of soft acoustic material, but also allows the frequency characteristics of uniform, but the need for housing renovation. .Room is not convenient to do so, may wish to adopt a simpler approach: do not deal with the ceiling, walls hung only in the four-absorption properties, a variety of soft materials such as cotton, hemp, silk, hair type, or other types of fiber fabric .things are available, all kinds of foam plastic to kill the surface of cloth decorated with a beautiful post is a good choice. .For example, if you hang on the wall quality 1mm thick velvet (or other similar texture) curtain fabric, it can only absorb about 1 / 5 of the acoustic energy (in the middle and high frequency, low frequency even worse), and the remaining .reflected out, so will not be able to eliminate low frequency resonance. .Solutions include: wall-curtains does not matter, leaving about 10cm distance (the gap in the absorption should be linked to other objects); discount or multiple hanging curtains; together with good low frequency sound absorption characteristics of large soft sofas, etc. .can achieve a certain effect. .Here in passing that the poor sound absorption characteristics in the listening room, it is inappropriate to use the kind of hardwood sofa. .Because various materials have different absorption characteristics, it is best to have the choice, the goal is to make high, medium and low frequency are symmetrical and balanced absorption. .Table 1 shows the absorption properties of several commonly used materials for reference. .Sometimes, the device can also be combined with their own characteristics and tastes of the absorption of non-equilibrium, for example, some people prefer the bass, while the amplifier output power with another is not big enough, or the poor low frequency response speakers, it may be appropriate to reduce .low frequency absorption. .This is not an ordinary sense of the high-fidelity option, but there is some defect in the equipment itself can still be used when. .In addition, because high-frequency directional speakers, listeners behind the rear wall and side wall reflections on the weakened high-frequency sound effects in recent times bigger, and for the elimination of low-frequency resonance, the effect of the wall around the base is the same ., and can be neglected. .Reduce the ambient noise sound absorption interior layout and interior sound absorption material with the advantage of a sound insulation performance of the atrioventricular some improvement, so that we can be more favorable environment in the music. .In the modern city, the environmental noise has become a public hazard, and this has been recognized by most people. .Please take a look at Table 2, which is a request of environmental noise of the table. .It can be seen, in addition to recording outdoors, listening to music room also requires a very low noise level - 30dB! This is what the concept? To know that people normally talk about the sound level in 60dB. .Therefore 30dB noise level, given a very quiet environment, for example: In this environment, you will be able to clearly hear the walls of a quartz clock ticking weak, or even a needle landing .sound. .Only in such a quiet environment, be possible to go deep into the details of music to really listen to good music, especially those large dynamic range of symphonic music. .Unfortunately, today most of the city's residents have no such blessing. .Room noise level is usually more than 40dB, the residents side of the road more often by the sound level to 60dB above the noise violations. .Therefore, in order to listen to good music, but also to physical and mental health, we must pay attention to less noise. .As a listening room with the house more to the right choices, not choose one side of the road in the Pro. .When we arranged the listening room sound absorption material, it begins to place a double effect: not only can absorb the sound room, the same can be rumored room came the sound absorption and reduce the proliferation of indoor sound to the outside (although slightly worse these effects .point). .Because the noise is mainly passed through the window, so there should pay special attention, in addition to the heavy curtains to absorb the noise, using the double windows is a better way, thicker glass, the distance between two larger, can be .reduced noise up to 10 ~ 20dB. .Building a sound absorption, sound insulation is good listening room, every home should be the goal. .It not only create a good environment can give yourself, but also reduces the interference neighborhood, because even the best music, for people who do not need it, all the noise! Readers, if you currently listening too much room sound absorption material .less to increase it <BR> Note.