Let's talk about the most basic requirements for getting the effect on the spot.
1. Video section
To put it simply, to get a real presence effect, the screen needs to cover what the eye can see. Generally speaking, the width and viewing distance of the screen have already determined more than half.
Generally, an angle of the artificial triangle is required, and the width of the screen is the opposite side of the angle. The angle formed by the person must be at least 30° to obtain the effect of the scene. If the angle reaches 120°, the person will be completely in the picture. Of course it is very difficult unless in the cinema.
The second requirement is the problem of depth of field, which is related to the problem of the distance between the display device and the person from the screen. When the display device can't be replaced (mainly contrast), if you are too close to the screen, you will see a picture with no stereoscopic effect. When the distance from the screen is more than 3 times the height of the screen, you can compare it. Good depth of field.
The third requirement is resolution. The human eye has a certain resolution to the resolution. Too low resolution will lose the sense of reality. At least 1200 pixels or more in horizontal resolution can deceive the eyes and let the eyes think that it is a real one.
The above three points can be summarized as follows: try to choose 16:9, resolution 1280*720 or more, large-screen high-contrast display device, viewing distance is about three times the screen height. With a 16:9 screen, you can get a wider viewing angle at a triple screen height distance.
2. Audio section
With a good picture, the sound is naturally not less, because many details are not only manifested from the picture.
As a home theater, the sound system must have at least 4 channels, which are left front, right front, left rear, and right rear. The better nature is 5 channels, because when 4 channels, the most important sound in the picture will appear in the middle of the picture. At this time, the same sound can only be emitted through the two front channels to fix the sound image. intermediate. If you add a center speaker, you can share the sound of this part.
Surround speakers can express a lot of information outside the screen. For example, an F15 fighter flies from the screen to the back of the audience. If there is no surround speaker, the sound you hear will only be concentrated in front, so it is not true, or The picture is in a jungle, but you only hear the sounds of various animals in front, and the silence behind them, so that you can't feel the immersion.
The consistency requirements of the five speakers are unified. For another example, for example, the Boeing 747 is flying in front, but when it flies to you, it sounds like a small airplane, which is not good.
Let me talk about the problem of adding subwoofer, 5.1, 7.1 channels are more than 0.1 channel, that is the subwoofer, also called subwoofer. The main purpose is to supplement the low frequency of the whole speaker system. If your main speaker (5 or 7) is very strong, you can also disable it. At this time, you must turn off the decoder's bass. The signal is assigned to the main speaker. But for the small main speakers, adding a heavy bass can be a good rendering of the picture. When the big bang happens around, it will be true.
Finally, talk about the speaker placement problem, AV system speaker placement is not as high as HI-FI, but also pay attention to the correct position. Now take the 5.1 channel system as an example. The front and rear speakers will be placed in their respective positions. The center speaker is located in the middle of the screen or above the screen. (For large screens, it is best to put a center speaker up and down and connect them in parallel. You can pull the sound image point to the middle of the screen. If the screen is large, you need to point the speaker, especially the tweeter, to the head of the person. The front left and right speakers are placed on both sides of the screen (this is nonsense), which is more than 45° angle with the listener, but not more than 90°, and the hollow feeling is too large (the HI-FI system is 60°), so that the line is used. Pulling the person-left speaker-right speaker becomes an isosceles triangle. The surround speakers are located behind the person, separated from the left and right, and the angle formed by the person is 120°, and the position is about 60 cm higher than the human ear, which can create a better sense of envelopment.
Because the ear responds to the sense of the direction of the bass is relatively slow, so the heavy bass can just find a place to put it, but be careful not to have a common shock around, so as not to produce sound.
Finally, set the delay of the decoder according to the distance from the speaker to the person.
90-inch screen, height is about 1.1 meters, viewing distance is about 3 meters
Explanation: Sound image - what appears from the day the stereo was born is actually the use of the human ear to distinguish the position of the position, so that more than two sound sources emit a different sound, so that the ear produces a sense of position. When the two speakers emit the same sound but the volume is different, what the person feels is that the sounding body is in the position where the volume of the two speakers is on the side of the volume, rather than from the speaker itself.
No Hand Washing Soybean Milk Machine
White Color Soy Milk Maker,No Hand Washing Soybean Milk Machine,No-Wash Smart Soymilk Maker,Automatic Soymilk Maker
JOYOUNG COMPANY LIMITED , https://www.globaljoyoung.com