With the development of the times, the corresponding audio is also developing rapidly. Among the many audio systems currently on the market, linear array speaker systems have appeared in many large-scale sports games and large-scale performances around the world. So what is line array audio, what are its advantages and disadvantages, and what is the principle? The following editor will introduce you to one or two.
What is a linear array
A chirped linear array is a group of radiating elements arranged in a straight line and closely spaced with the same amplitude and phase.
Although they are arranged in a straight line, the coverage angle is different. The concept of linear arrays is not unique today. It was originally proposed by American acoustics expert H.F Olson. In 1957, Olson published the classic acoustic monograph "Acoustical Engineering" (Acoustical Engineering), discussing that linear arrays are particularly suitable for long-range acoustic radiation. This is because linear arrays can provide very good directivity of vertical coverage for good acoustic results.
The early linear array speaker system appeared in the 1970s, but it was incomplete. In the form of a "sound wall". Dozens or even hundreds of speakers are stacked horizontally and stacked vertically to form a sound wall. When the power of 10,000 watts is turned on, it really shakes the mountain and is imposing. But people quickly discovered its shortcomings. Not only do they need too many speakers, but also the interference between speakers makes the sound quality worse, and the directivity and coverage are affected. At the European AES Conference in 1983, Philips introduced the concept of a Bessel function matrix using a simple weighting factor to solve this problem. However, to manufacture Bessel arrays, a license must be obtained from Philips and a corresponding price must be paid. It is interesting that companies using linear array loudspeakers are silent about Bessel arrays. The current linear array speaker system has been fully improved, and it is not the same as the early days. It is also quite practical in structure. For example, dozens of boxes can be assembled, hung, and wired within one hour, and put into use immediately.