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Non Contact Thermometer, Infrared Thermometer,Non contact Baby Thermometer,COVID19 Axiswell Technology Co., Ltd , https://www.medhealthycare.com If you have the opportunity, it is best to visit the professional sound-absorbing environment such as the anechoic room and the recording studio, which will open up our horizons. At the very least, you should also pay attention to the theater or other places with sound absorption design, and draw some useful experience.
In principle, if you want to pursue the true original taste during playback, you should not be disturbed by the reflected sound, just listen to the direct sound. This requires a complete sound absorbing environment, which is often difficult to achieve (the anechoic chamber is expensive and inconvenient to use), so it is usually a partial sound absorption of the room, retaining some of the reflected sound and using it. According to the author's understanding of some family listening environments, most of them do not use sound absorption design, although some of them have used expensive equipment and even fever wires. Therefore, the pursuit of a small part of the sound absorption in these families is a minimum choice, because it is from scratch, you can receive the effect of immediate results, that is: significantly weaken the low-frequency roar and make the sound become More clear and sweet. For families that have used a small amount of sound absorption, it is advisable to work hard on most sound absorption and equalization sound absorption, so that the device can reproduce the sound of the field closer to high fidelity. You can refer to the relevant books and use the engineering calculation method to design the sound absorption. Generally, the size of the listening room in the home is not large. When designing, the reverberation time should be controlled within 0-6 seconds. The smaller the better, the appropriate sound absorbing materials should be calculated and selected accordingly. A rough estimate can also be made because it is not required to be accurate. The figure is the reverberation time calculated by the author according to the relevant formula according to the area of ​​the small listening room of about 15m2 - the average sound absorption system curve, which can be used for reference.
According to the author's experience and feelings, it is generally believed that the sound absorption in the room is always too much, only a small amount, so it is not necessary to calculate in general, let's talk about this kind of non-quantitative sound absorption treatment. . First look at the ground, poor ground will make the low-frequency reflection too strong, if the listening room has been paved with wooden floor, it is ideal, its sound absorption characteristics are more uniform. If it is a hard floor, it should be covered with a thick carpet. In order to facilitate walking, the carpet area can also be limited between the speaker and the listening position. The key is to have thickness, which can be achieved by using the underlying cardboard, wood board, fiberboard, and the like. The ceiling and the four walls are decorated with sound-absorbing materials of different sizes of perforated plates. Combined with a small amount of soft sound absorbing material, the frequency characteristics can be made uniform, but this requires renovation of the house. Inconvenient to do this, it may be easier to use: no handling of the ceiling, only hanging sound absorbers on the four walls, a variety of soft materials, such as cotton, hemp, silk, wool or other fiber-like fabrics They are all available, and all kinds of foaming plastics are also a good choice when they are decorated with beautiful cloth. For example, if you hang a 1mm thick velvet (or other similar texture) curtain on the wall, it can only absorb about 1/5 of the sound energy (in the middle and high frequency bands, the low frequency is worse), the rest The reflection goes out so that it will not eliminate the resonance of the low frequencies. The solution is as follows: the curtain cloth should not be close to the wall, leaving a distance of about 10cm (the other sound absorption should be hung in the gap); the curtain fabric is folded or multi-layered; and the large soft sofa with good low-frequency sound absorption characteristics is used. It can achieve a certain effect. By the way, it is pointed out that in a listening room with poor sound absorption characteristics, it is not suitable to use that kind of hardwood sofa. Since the sound absorption characteristics of various materials may vary, it is preferable to use them selectively, with the goal of achieving symmetrical and balanced absorption of high, medium and low frequencies. Table 1 lists the sound absorption characteristics of several commonly used materials for reference. Sometimes, you can also use the characteristics and hobbies of your device to absorb unbalancedly. For example, some people prefer bass, and the power output of the amplifier is not big enough, or the speaker's low frequency response is not good enough, it can be appropriately reduced. Low frequency absorption. Although this is not a high-fidelity choice in the ordinary sense, it can still be used when there is some defect in the equipment itself. In addition, due to the high-frequency directivity of the speaker, the rear wall of the listener and the rear of the side wall have a greater effect on attenuating the high-frequency near-resonant sound, and the effect of the front and rear walls is basically the same for eliminating the low-frequency resonance. Can not be neglected.
Indoor sound absorption and reducing environmental noise
An added benefit of arranging indoor sound absorbers is that the sound insulation performance of the room is improved, allowing us to enjoy music in a better environment.
In modern cities, environmental noise has become a major public hazard, which has been recognized by most people. Please take a look at Schedule 2, which is a table that asks for environmental noise. It can be seen that in addition to the recording room, the room listening to music requires a relatively low noise level - 30dB! What is the concept? You know, the sound level of people's normal conversation is about 60dB. So the 30dB noise level gives a very quiet environment, for example: in such an environment, you will be able to clearly hear the faint hum of a quartz clock on the wall, even a steel needle landing sound. It is only in this quiet environment that it is possible to go deep into the details of the music in order to really listen to the music, especially those with a wide dynamic range. It is a pity that most of the residents in today's cities do not have this kind of blessing. The noise level of the living room is usually above 40dB, and the residents on the side of the road are often subject to noise levels above 60dB. Therefore, in order to listen to music, but also for physical and mental health, we must pay attention to reduce noise. As a room for listening to the sound room, it is better to choose it properly. It should not be chosen on the side of the road.
When we placed the sound absorption in the listening room, it began to have a dual effect: not only can absorb the sound inside the room, but also absorb the sound from the outdoor and reduce the spread of the indoor sound to the outside (although these effects are slightly worse) a little). Since the noise is mainly transmitted from the window, it is necessary to pay special attention to it. In addition to using heavy curtains to absorb noise, it is better to use double-layer windows. The glass is thicker and the distance between the two layers is larger. Attenuate noise by 10 to 20 dB.
Building a listening room with sound absorption and good sound insulation should be the goal of every family. It not only creates a good environment for itself, but also reduces the disturbing neighbors, because even the best music is noisy for those who don't need it!
Readers, if you have too few sound absorbers in your current listening room, please pay attention to increase it.