How to improve the sound effect of the multimedia conference system?Bar music sound

　　In a multimedia conference room or home theater, in addition to the influence of the indoor acoustic environment on the sound field, the placement of speakers is particularly important. Under the premise of a good indoor acoustic environment, the more accurate the sound image positioning and the more realistic the timbre, the more lifelike the sound and image integration effect will be. Below, we will discuss the placement of the three front (left, center, and right) speakers, surround speakers, and subwoofers in turn.

　　1. Placement of center channel speakers

　　The front center speakers are generally placed as close to the center of the image screen as possible. The center speaker has the greatest impact on the sound quality of the language. In order to ensure that the dialogue is accurately positioned in the center of the screen and the sound is clear, a separate speaker specially designed for the center channel should be used. Most of the center channel speakers are horizontal horizontal boxes, and the best placement is the top of the TV (if a front projection display screen is used, it should be placed behind the screen), that is, it should be as close to the screen as possible.

　　2. The placement of the left and right channel main speakers

　　The placement of these two speakers has a certain relationship with the position of the center channel speakers. In order to ensure the stability of the left and right movement of the sound image, they should be placed on both sides of the center channel speaker, and the three speakers should be at an equal distance from the position of the best listener in front of the screen. Generally speaking, the placement of the center speaker should be a certain distance back from the left and right speakers, until the sound fields of the two can be completely combined to create a truly unified sound image positioning. In addition, the vertical height of the left and right channel speakers should be 0.3m lower than the center speaker axis, otherwise the height difference of the left, center and right speakers is too large, and the front sound image will be horizontal When shifting, it will give people the feeling of sound and image jumping. Usually floor-standing speakers can meet the above requirements. If bookshelf speakers are used as left and right speakers, they should be fixed on the speaker brackets so that their heights meet the above requirements.

　　The distance between the left and right channel speakers from the screen is related to the size of the screen. If a color TV with a large or medium screen is used in a small room, the left and right channel speakers can be placed close to both sides of the screen. If the screen is small, place them a little further away from the screen for a wider stereo field. To sum up, the sound directivity of the speakers of the left, center and right channels is more important than the diffusion, that is, the radiation angle range of these three channels should be mainly towards the best listening position. This can reduce the impact of reflected sound from the floor, walls and roof, and properly ensure the clarity of sound image localization.

　　3. Placement of surround channel speakers

　　The placement of surround speakers should vary depending on the audio-visual environment (room conditions) and the type of surround speakers. For the left surround and right surround speakers, the diffusion of the sound should be more important than the directionality, which is conducive to creating a rich surround atmosphere. When placing dipole speakers, two factors should be considered: resonance and self-attenuation. The best position for anti-resonance is 20% of the indoor space height from the ceiling (or ground). To make the frequency response smoother, a new device called a low frequency "trap" (absorb low frequencies) can be added to eliminate reflections that cause the sound to decay.

　　For direct radiating loop speakers, there are many layout options to consider. For example: fixed on the walls on both sides, and make them point to the rear corner; fixed on the rear wall, so that they open outward and upward in a figure-of-eight shape and face the junction of the side wall and the ceiling; placed on the sides against the wall on the floor and pointing upwards where the wall meets the ceiling, etc. There are many other options available depending on the room. The surround sound field of a home theater is mainly formed by the sound reflection and refraction of the reflections in the room facing the surround speakers, and the indoor acoustic conditions of different rooms vary widely. As long as you experiment patiently and compare carefully, you will be able to find the best placement plan.

　　4. The placement of the subwoofer

　　Usually, the subwoofer is placed near the front corner, preferably more than 1m away from the corner, which can reduce the interference of standing waves. You can also place the subwoofer on both sides of the best listening position and keep a proper distance, because the human ear is not very sensitive to the directionality of the subwoofer coming from both sides, so the subwoofer will not interfere with the front three at this time. The original sound image localization of the channel.

　　The following methods can effectively help find the best placement of the subwoofer: put the subwoofer in the best listening position (move away the nearby debris temporarily), connect its speaker cable and repeatedly play a section with strong bass effect music, then go around the room and listen carefully. When listening, the ears are required to be on the ground, roughly at the height of the subwoofer. At this time, find the point where the bass is stable, deep and clear, which is the best placement of the subwoofer.

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