【 Weak current College 】 how to create a good listening environments---Power By 【 China power house network 】

Apart from the moment of humanity is inseparable from the air, another time without (and want to leave it without) thing is probably the sound. ? We can close your eyes and see, but cannot close your ears and hearing. We live in this world, nor absolute silence, this illustrates the importance of the human voice. Because of this, the pursuit of a beautiful voice, the Elimination of harmful sound, people are always trying to achieve. Indoor acoustics phenomenon in everyone's life is at least 1/3 to 1/2 time is spent in the room, listening to music. Therefore an inevitable phenomenon of indoor acoustics of concern. As the mirror will reflect light, house walls, floor, ceiling will produce reflection about the sound, unfortunately Sonic and cannot be seen, this phenomenon is often neglected. In fact, the sound reflection phenomenon is very common and interesting (if Beijing tiantan echo wall). From housing in a sound that is transmitted in the form of waves, and from the numerous approaches to reach the listening position. The actual reflection phenomenon is very complex, and as housing shape and Interior objects of the senses, I believe that this is not difficult to imagine and understand. Due to the reflection of the existence of the phenomenon, in the listening position, we actually hear and not purely by the speaker sound is sound and sound directly to the various reflections superimposed. So, this kind of overlay effect after what? " Reverberation time "this concept is more popular and important, it refers to the sound, the sound continues gradual decrease in energy reflection time. Here the "mix" of the image because the application is in the Interior of a sound master is not a single, but from all directions to, chaos. Usually the reflections are collectively referred to as mixed noise (or subdivided into early reflections and the mixed sound). On the concept of the reverberation time, acoustics has its precise definition refers to sound sources stopsounding acoustic energy density after residual drops original values one millionth time elapsed time. It is worth pointing out that it can describe the audio clarity, chubbiness, generally speaking, the reverberation time is short the articulation, the reverberation time is the sound richness good long. The following then introduce another reflection on the phenomenon, which are called "normal room fire," "resonance," resonance "acoustic phenomenon. This refers to the room because of its geometric scale and for certain frequencies of sound waves to special offers, be strengthened (formation of standing waves), it is also a widespread phenomenon. For a typical family houses, this kind of resonance frequency of the pitch is about bass area in 100Hz. If the room can not be sound absorption we can start from the acoustic phenomenon to imagine, if there is no sound in the room, the room itself was not absorb sound, will be how a scene. Then the sound once issued is endlessly reflection on, and the sound will be mixed together. For example, in the room playing language broadcasting, the second pronunciation appeared the first pronunciation still ringing third pronunciation appeared for the first two simultaneous ringing sound is still ... Plus will inspire different frequency resonant sound, regardless of language or music we are completely unable to tell (apart from the first tone), let alone to enjoy it, you can only hear a noise! readers if you are interested, you can simulate this: find a complex organ (tremolo few better), in turn, screw-down its key don't let go and listen to listen music to noise. Of course these are just in an extreme case of imagination. In fact as the walls, the air, the human body can absorb sound energy, reflections always disappearing. However by imagining that allows us to further understand the importance of sound absorption in a room. Luckily we did not live in completely acoustic environment, otherwise it is unimaginable! Although thereal room can absorb some of the sound energy, but often very unsatisfactory. If we purchase a very good sound equipment, they issued a high-fidelity sound, because listening room acoustic characteristics, not the reverb and echo the voice of the original is severely distorted, that's what a pity!, therefore, a true high-fidelity playback of admirers, should also be room for reasonable sound absorption of admirers.
Sound-absorbing atmosphere method if there is a chance, it's best to visit anechoic rooms, recording studios and other professional acoustic environment, so you can explore our horizons. At least, it should be noted at the cinema or other acoustic design, draw point useful experiences. From the principle, if you want to replay the pursuit of a truly authentic, you should not affected by the interference of reflections, only listen to the sound. This requires a full acoustic environments, which are often difficult (anechoic room cost, use also inconvenience), it is usually a part of the room acoustic, retain some reflections and use. According to the author for some family listening environments, and most are not using the sound-absorbing design, although some families have used the expensive equipment and fever wire. Therefore, these family pursuit of small parts of the sound absorption is a fundamental choice, because it is from scratch, you can receive the stanchion see shadow effect that obviously low frequency ROAR, and make the sound becomes more clear and pleasing to the ear. Sound absorption for a small number have been adopted, the family may wish to recommend to the most balanced sound absorption and sound absorbing efforts, so that devices can be closer to the scene to produce high-fidelity sound. You can refer to books, the use of engineering calculation methods for sound design. General family room area is not large, the design of the times the reverberation time control in 0 6 seconds, the smaller the better, according to this calculationand select the appropriate sound-absorbing materials. As does not require very accurate, can be roughly estimated. The drawings are the author according to the formula, follow around small 15m2 listening room area calculated the reverberation time-average sound absorption system curve, is available for reference use. According to the author's experiences and feelings, that usually room sound-absorbing material always worry about it much, just worry its small, so in general you can also do not have to be calculated, below on this quantitative absorption treatment method. First look bad on the ground floor, makes strong reflections in low frequency, if you listen toSound room has a wooden floor coverings, it is desirable, it's a uniform sound absorption characteristics. If you are a hard surface, it should be covered with thick carpets. For the convenience of walking, carpet area can also be limited to the speaker and the listening position, the key is to have a thickness, you can use in their underlying cardboard, wood, fibreboard, etc. Ceiling and wall with different specifications of microperforated material to decorate. With a small amount of soft sound-absorbing material, or you can enable frequency characteristics even, but the need for housing decoration. It is not convenient to do so, may wish to use the room of the simpler approach: no ceiling, only four wall hanging sound absorbing materials, all kinds of soft materials such as cotton, linen, silk, wool or other fibres textiles are available, all kinds of foam on the surface it with attractive cloth decoration is also a good choice. For example, if the wall hanging 1mm thick wool quality (or other similar texture) curtain fabric, it can only absorb approximately 1/5 of the sound energy (in the medium and high frequency, low frequency worse), the rest of the reflex to go out, it will not be able to eliminate low-frequency vibrations. Solution: curtain fabric not matter against the wall, leaving around 10cmdistance (gap should be linked to other sound absorption in); curtain fabric at a discount or more layers of suspension; then with the use of low frequency sound absorption characteristics of a good large soft sofas, etc, you can achieve a certain effect. Here in passing that, in the sound absorption characteristics of listening room, is not that kind of hardwood sofa. Due to the absorption characteristics of various materials have different, so it is best able to selectively use, the goal is to high, medium and low frequency be symmetrical and balanced absorption. Schedule 1 lists several commonly used materials for sound absorption characteristics, for reference. Sometimes, it can also be combined with own equipment's characteristics and hobbies for the absorption of non-equilibrium, for example, some people prefer the bass, and the hard place of output power and is not large enough, or poor low frequency response of the sound, it may be appropriate to reduce the frequency of absorption. Although this is not a common sense of the Hi-Fi choice, but some of the equipment itself or you can use when defects. In addition, because of the nature of the high-frequency sound, listen and people behind the wall and the side wall rear on reflects high frequency in recent times reduced sound effects to larger, and for the Elimination of low frequency resonance, front and rear wall of the basic effect is the same, be dispensed with. Indoor sound absorption and reduce ambient noise-absorbing fabrics for interior layout of a fringe benefit is that the sound insulation of atrioventricular node gets some improvements, so that we can in a more favorable environment to enjoy the music. In the modern city, environmental noise has become a major nuisance, this has been known by most people. Please take a look at the Schedule 2, this is a request for environmental noise. As can be seen, in addition to recording rooms, listening to music room also requires very low noise level – this isa 30dB! what concept? you know, people normal conversation sound level at approximately 60dB. So the noise level, 30dB given is a very quiet environment, for example: in such an environment, you will be able to clearly hear the wall a quartz clock ticking sound of weak, even a spin down to the ground. Only in this quiet environment, will it be possible to drill down into the details of the music, can we truly listen to good music, especially those dynamic range very large symphonic music. Unfortunately, today the city inhabitants, most of all, there is no such place. Indoor noise level is usually more than 40dB, road residents more often affected by sound level noise in more than 60dB. Therefore, in order to listen to good music and to physical and mental health, care must be taken to reduce noise. As room with room to choose correctly, should not be selected on the side of the road in the Pro.
When we hear the sound of the sound-absorbing interior layout, it began to occur in a double function: not only can absorb Interior voice, also can absorb outdoor incoming voice and sound to the outdoor diffusion (although these effects on the poor). Since noise is from the Windows of the incoming, so there will be special attention, in addition to the use of heavy curtains to absorb noise, use a double window is a better way, glass thickness, distance between two layers of bigger, reduces noise up to 10 ~ 20dB. Building a sound absorption, sound is good, the room should be every family goal. Not only does it give ourselves to create a good environment, but also reduces disturbing adjacent, because even the best music that does not require it, are all noise!