[Audio Network Information]
Introduction to Linear Array Speakers <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> However, some people have caught this point to apply, the different arrangement of the speakers in the audio, and the cooperation of the external balancer make the sound quality have another feeling. The linear array is based on the "line sound source" practice and is a form of speaker system that is also referred to as a "point source" of conventional speakers, often referred to as a line array. The ideal line source (which is of course difficult to achieve), the speaker is twice as wide as the listener, and the listening area is doubled. Point source. The speaker is 4 times larger than the listener, and the listening area is increased by 4 times. Therefore, the point source increases the distance attenuation by 10log1/4=-6dB; the line source increases the distance attenuation [AD: line 10log1/2=-3dB. That is to say, in the fantasy situation, the line source is longer. The distance is twice as small as the attenuation of the point source. This is why linear arrays are used in large-scale art performances.

But the linear array of most companies is a quasi-linear array, not a linear array in the true sense. Linear arrays are the easiest to confuse, because many people don't know how to distinguish them. To identify them, there are two main methods:

First: the treble vertical control angle can not be greater than 1 degree, otherwise it will inevitably interfere after 85 meters, and must explain the angle of control, otherwise it must be a quasi-linear array.

Second: After 150 meters, can you clearly hear the high frequency above 10KHZ, often most people will not have the opportunity to audition linear arrays 150 meters away, therefore, many brands can confuse others through the near-listening effect.

The middle and high sounds of the traditional speaker are the sound energy through the horn. Just like the flashlight is concentrated by the lampshade, the light is diverging and the range is limited. Our sound lens gathers the sound energy in the same way that the laser collects the light energy. Far, the sound pressure is more strengthened.

The significance of full-frequency acoustic coupling technology <br> The trend of sound reinforcement has been to increase the actual SPL (sound pressure level) in the concert, and increase the coverage range covered, which inevitably leads to an increase in the number of speakers. Conventional horn-loaded speakers are usually combined into a fan-shaped array with the horizontal coverage angle of each speaker to reduce overlapping coverage areas that cause mutual cancellation interference. In this arrangement, only one speaker can be provided in the same direction. High definition sound. The "straight array" design taken to achieve the furthest distance and higher SPL (sound pressure level) results in severe interference in an uncontrollable direction. Affect the quality of the sound, the analytical power, the coverage, even if arranged according to the instructions (always the "best" compromise, because the polar coordinate response of the individual horns varies with frequency), the sound waves radiated between the speakers still cannot be organized Coupling, so the traditional system solution is fundamentally flawed. What is more troublesome is the chaotic sound field generated by the coherent sound source, which wastes the sound energy, so in order to achieve the same sound as the vertical array of a single clear acoustic lens. For pressure levels, traditional arrays require several times more power and more power than the speakers used in the vertical array of acoustic lenses, even if the volume is large enough but not equal to the sound quality.

To illustrate this principle, think about what happens when we throw stones into the water. If we throw a stone into the water, we will expand the circular ripple from the place where the stone enters the water. If we still have a stone in the water, we will See what is the so-called chaotic wave field.

If we throw a large stone of the same size and weight as the stone, we will see a circular ripple like a small stone, but the amplitude is very large. If you stick the individual stones together, the effect is the same as that of the big stones. This illustrates our idea that if we can create a single sound source with separate speakers that can be transported and operated separately, then we have achieved our goal of providing a generally coherent and predictable Sound field. Therefore, through this research and development, we have developed a fully modular, adjustable single source of sound as a characteristic vertical array of acoustic lenses, and its significance and value are obvious.

Traditional big-name speaker factories have developed their own linear arrays in order to prove their technical strength. There are also some high-end brands. For the face, there must be a linear array, but the core technology of the vertical array of acoustic lenses is not a hot brain. Do it. According to the theory of 1933, the core technology of linear array is the coupling technology of treble above 6K. This is a world problem, because the linear array will only be established if the treble sound is controlled at a vertical projection angle of "0". If you can do it, then this manufacturer will become the world's largest audio industry leader.

We compare all of these manufacturers with linear arrays and understand that they are still using conventional horn and phase plug structures to solve the projection angle problem, which does not play a fundamental role in changing the physical properties of sound waves, because it can be controlled at most vertically. About 10 degrees, then for a vertical array, the projection is less than a few meters, and it has begun to interfere, and the purpose of coupling is not achieved.

The reason is: over the years, based on the limitations of industry technology, many of the world's top famous brand manufacturers still use the traditional horn extrusion method, but can not change the physical characteristics of the sound waves in the air (spherical wave), single speaker The projection angle is at least 10 degrees vertical, and the coupling condition requires a large gap of almost "0", and the horn is naturally scented (sounds unreal).

Combining with other scientific principles, research and invented the acoustic lens, which is the real beginning of what we have studied called full-frequency acoustic coupling splicing technology. It is the heart of full-frequency acoustic coupling technology, which can change the characteristics of traditional acoustic waves. The traditional sound wave is changed into a parallel wave by it, the vertical angle has reached a substantially parallel state of 0.12 degrees, and the horizontal angle reaches 120 degrees. Because it is not a horn, there is no sound dyeing and the volume can be reduced. In physical acoustics, the near field expansion makes one The person walks a long distance from the acoustic lens system, and the sound pressure level changes little because of the unconventional attenuation rate of the system. In fact, many listeners experience the high fidelity of the near-field listening experience from far away, the improved stereo image and the extraordinary clarity. Subjectively, the speaker seems to be very close to you and the sound is in front of you.

As a speaker for the conference environment, the advantages of the vertical array speaker for small acoustic lens modules for conferences are even more prominent. Because like the lecture hall, the auditorium, the large and medium-sized conference hall, most of the surface decoration is very smooth, and the relative echo is relatively large. With the traditional speaker, there will be many serious phase interference problems, plus the echo is heavy, that is, the return sound and the direct sound. Crossing together to form a secondary interference, the microphone feedback problem is also caused by these reasons (even if the microphone head is not facing the speaker). The small conference-specific acoustic lens vertical array speaker is composed of several full-range modules arranged vertically. The vertical angle of the sound wave of each module is 0.12 degrees, which is almost parallel to the ground and ceiling.

The characteristics of the vertical array speaker for the conference acoustic lens module are as follows:

1. Due to the vertical alignment, the sound waves are coupled together without phase interference.

2. Since each acoustic lens full-frequency module emits parallel sound waves, the sound attenuation is not 6 dB, but 3 dB, for every 1× increase in distance from the unit module. This means that the sound waves will travel very far.

3. Based on the vertical angle of the single acoustic lens module, it is “0” degrees, and a new attenuation characteristic is generated. In the vertical direction, a plurality of identical acoustic lens modules are arranged in the vertical direction, and the human ear can only hear one module. The sound, when you hear it, you will hear the sound of several modules together. (Only when the vertical diffusion angle of the sound wave is "0", it is possible.) In addition to its unique attenuation, the result is common sense. Unexplained phenomenon: the far-talking sound is not small, the near-listening sound is not loud (large), the direct-frequency sound of the full-frequency acoustic coupling characteristic (parallel wave), and its unique horizontal coverage full-frequency audience area with a diffusion angle of 120 degrees Loud coverage.

4. Since the vertical angle of each full-frequency module is controlled to “0” degree, based on the fact that the microphone only constitutes a feedback relationship to one of the modules, the anti-howling ability is very obvious, and the anti-calling volume is nearly 20dB higher than the traditional speaker volume. .

5. The coverage of the site is determined by the length of the array. The length of the array (the number of modules) is increased, and the frequency response bandwidth can also be increased (one of the characteristics of the acoustic lens).

Another benefit of the acoustic lens is the high sound pressure level suppression outside of the specified coverage area, making the acoustic lens a good solution when environmental noise control is a challenge. For example, in the case of outdoor amphitheatre and open-air sound reinforcement venues close to residential areas.

In short, the precise directivity inherent in the acoustic lens, the flexible and predictable sound reinforcement method, and the unprecedented sound reinforcement concept and vision for the acoustic design are a global revolution in the field of audio sound reinforcement!

Guangzhou Ehang Electronic Co., Ltd. , https://www.ehangmobile.com