What is a dot matrix speaker? 20, What is a dot matrix speaker?

A concept introduced to focus on the periodicity of crystal structure. First, consider an image of a two-dimensional periodic structure. You can choose any point on the diagram.

Lattice. o as the origin. On the diagram, you can find a series of ideas that are exactly the same as the O point environment, this set of infinite number of points.

The dot matrix constitutes the dot matrix. Make an image.

A translation, corresponding to the position of the shift from the origin o to any matrix, the image remains unchanged. This invariance indicates that the lattice reflects the translational symmetry of the original structure. Obviously, the above considerations can be generalized to infinitely large crystals with three-dimensional periodic structures.

It should be noted that the origin position can be arbitrarily chosen, but the resulting lattice is equivalent. The lattice translation vector l can always be expressed by the combination of three non-coplanar base vectors a1, a2 and a3: l = ma1 + na2 + pa3, where m, n and p are three integers.

The parallelepiped formed by A1, A2 and A3 is called a unit cell or primary unit cell, which contains the basic repeating units of the crystal structure. It is worth noting that neither the base vector nor the unit cell are unique, and there are an infinite number of options. A primordial unit cell is the smallest unit of crystal structure.

Sometimes, however, in order to better reflect the symmetry of the lattice, a slightly larger non-primary unit cell (i.e., the unit cell contains more than one lattice) can also be used.

Dot matrix speakers? Not a line array?

A line array speaker is a group of radiating units arranged in a straight line up and down, spaced as closely apart as possible, and have the same amplitude and phase. Due to the same phase, the speakers are close to each other. A set of line arrays can be thought of as a whole loudspeaker.

In the performance or large space and long-distance sound reinforcement, the number of listeners is often tens of thousands or tens of thousands, and the power of the current pair of speakers is far from meeting the power required for listening. Therefore, in the past, in such a sound reinforcement place, several pairs or more loudspeakers were often stacked into a speaker wall, called a speaker matrix. But such a matrix, because of the phase problem.

Some of the frequencies in the speaker interfere. Seriously affect the restoration of sound. That's why there is the birth of wired array speakers.

Answer: The line array speaker is a remote speaker, the power is mostly 3 ways of frequency, the sound is linear, suitable for outdoor large-scale party sound reinforcement; Ordinary speakers are short-range speakers, with small power and mostly 2-way frequency, which is suitable for indoor celebrations or home use. Line array speakers are also known as linear whole row speakers, and multiple speakers can be combined into a loudspeaker group with the same amplitude and phase (line array group) called a line array speaker. The line array speaker has a wide range of sound coverage, but it does not essentially change the sound quality, because he cannot ignore the problem of mutual interference.

A speaker is a device that converts an audio signal into sound. Generally speaking, it means that the speaker host cabinet or subwoofer cabinet has its own power amplifier, and the audio signal is amplified and the sound is played back by the speaker itself, making it louder.