Talking about sound insulation

For many years, most enthusiasts, or self-proclaimed enthusiasts, have done some processing for their listening environment in order to improve listening conditions and make it beautiful. Then someone put a felt on the wall and put two SOUND TUBE in the corner. There are also some SONEXs that are bought at a price that are expensive and placed on the left. And some will buy some "hippocampus" sponge pads (of course much cheaper) but they can achieve similar results. Some more, like the author more than a decade ago, picked up a lot of paper cards for eggs, sprayed them with different colors, and then on the wall, the ceiling, one by one, the effect is quite Not bad. Some friends have heard me say that there are several pots of plants in different locations in the home. If the sound is good, the acceptance of other family members will be higher. Well, all these measures are basically to play the role of tuning. In extreme terms, it can only be used for sound absorption, but it must not play the role of sound insulation. why would you say so? Because this is indeed the illusion of many enthusiasts, everyone is thinking that since the sound is sucked, isn't it just running away? But the cruel reality is this: the sound sucks away only the wishful thinking of the people. Yes, the above-mentioned various measures will really absorb the "single" sound, but the amount of the sucking and the remaining comparison are Slightly speaking, sucking the sound is to convert the sound from sound energy into another kind of energy (usually heat). In the listening room, if you talk about the energy of the sound, the engineer will smile and tell you this. Can ignore it.

But if you are a more serious fan, the sound insulation may have a deeper meaning for you. In professional recording and listening, sound insulation is a very important topic, and there are many universities asking. Here is a simple example. When we listen to music with headphones, in addition to the sound field pointer, you will find that whether it is frequency domain, or transient, dynamic, fineness of music, etc. can be easily Better than the speakers in our home. Why is the difference between the two? There are many reasons for this, and one of them is that the sound insulation conditions of the two are very different.

We usually listen to HiFi at home, and the sound pressure is generally maintained at 90 to 100 dB, and then the family or neighbors will complain. Here, on the one hand, the sound pressure of the sound, close to 110dB is the upper limit of the general home, in this range the equipment is very prone to fatigue, and on the other hand, as a listener may be happy, but once longer Time is exposed to strong sound pressure, our ears are already at the limit of the sound pressure, so our hearing sensitivity, such as analytical ability, will become dull. In the general urban home, the environmental noise is not low, and the smallest is about 40dB. If it is so prosperous and densely populated in Hong Kong, it will be more than that. So let's see if we listen to music at home, the sound pressure is maintained at 100dB and the neighbors can accept it, minus the noise level (Noise Platform) 40dB, so the remaining available dynamics is only 60dB. In general, 60dB of available dynamics is quite good, but equipment, especially speakers, often have inaccurate performance when they are at the limit, so we will feel the sound is not very good. If you want to increase the dynamics, for example, increase to 65dB, then the upper limit of the sound pressure will be increased to 105dB. At this time, the nonlinear distortion of the equipment will increase in geometric progression, and your hearing will become less fascinating at 105dB. So when you add up, you will feel bored. Here, smart readers may have thought, why can't the noise step be reduced? Yes, if the noise step is reduced by 5dB, that is, 35dB, so when the upper limit of 100dB sound pressure is maintained, the upper dynamics will be 65dB. At this time, compared with the above example 105dB, the equipment and our hearing are not in a state of fatigue, so the listening quality is It will have an order of magnitude improvement over the 40dB noise step and the 105dB sound pressure limit. Readers will also know that the sound will be better in that case. To reduce the noise step, you have to talk about sound insulation.

Gaming Projector

Whether the game can be played smoothly depends on the low latency of the projector, whether it can be optimized to within 30ms, or within 50ms, which is difficult for non-professionals to perceive. However, the cable and network speed and the configuration of the computer (game console) have an impact on the game delay, so you can't completely throw the pot to the display device.

The first is the problem of memory. Be sure to choose a larger one, the bigger the better, otherwise the screen will freeze. The second is that the resolution must be above 1080p, otherwise the details of the projected game screen will not be clear, which will greatly affect the game experience and viewing experience. The other is about motion compensation. The game screen is generally faster for animation playback. It must be equipped with motion compensation, otherwise the screen will be stuck.

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