Acoustic system and its variants

The acoustic system is now part of any multimedia solution. The term itself presupposes the possibility of sound output. For example, a couple of decades ago, the audio card and the speaker system were not present in all computers, and to hear the squeaking of the system speaker, many users soldered the solution connected to the parallel port (LPT), and the "multimedia" was determined by the presence of MMX command support in the central processor . Now everything is different. The acoustic system has become an indispensable attribute of even the simplest computer. Moreover, many applications simply refuse to work without finding a sound card.

Types of sound solutions

Depending on the application, the speaker system can be home (home), concert, studio, etc. This determines its capabilities and final cost: it is obvious that, for example, it is not necessary for the house to purchase an expensive studio model.

Since different layouts are allowed, ceiling, wall, desktop and floor acoustic systems are distinguished. Usually this characteristic is indirectly related to the previous one.

It is known that sound vibrations can differ in the form of a wave. Therefore, the division into high, medium and low frequencies is conventionally accepted . Systems that reproduce sound can use one of two design solutions: be broadband and with a separate output. The first is usually budget decisions. Each speaker uses a single speaker, capable of reproducing from 40 Hz to 20 KHz (ideal, as a rule, unattainable in practice). The fee for such versatility is relatively low quality of playback. This is easily explained if we recall the principle of the dynamics. The alternating current passing through the coil creates a magnetic field that interacts with the field of a permanent magnet. Thanks to the forces of attraction, the diffuser shifts, squeezing the air in front of it. It is this compression that a person perceives as a sound wave.

But what happens when it becomes necessary to simultaneously reproduce the sounds of different frequencies? After all, the sound picture of the world is complex: in it sources of oscillations do not go in order, but overlap. The answer is simple: reproduction with a broadband speaker is a trade-off between the simplicity of the device design and the sound picture. By the way, a portable speaker system is most often done exactly this way.

The second solution is to use your speaker for each frequency group. Such devices are called multiband ones. The different-frequency electric current transmitted to such an acoustic system is divided in the crossover filter into components that are reproduced on the respective speakers. The smaller is a peeple, reproduces high frequencies; Large diffuser - subwoofer for low; And the driver is a mid-range speaker. The crossover mutes all other frequencies, except those designed for each specific diffuser.

The next characteristic is the presence of a built-in amplifier. It is present in active systems and is absent in passive systems. In the latter case, the amplification problems are solved by a third-party instrument.