I believe everyone knows about audio and speakers. Do many friends think that audio and speakers are actually a product? Actually they are not. There is a difference between audio and speakers. Today I will introduce you to the difference between audio and speakers. Where is it?
1. The difference between the whole and the part.
That is, sound is a complete system, and speakers are only part of this system. It is a sound-producing device, and the system also includes other equipment such as mixing.
2. The difference between professional and amateur.
Both can also make sounds. But the sound is a professional-level sound system from the function to the configuration. The speaker is usually a simple sound system composed of one or two ordinary speakers. Just like home theater can be called audio, and computer speakers are usually just called speakers because of their simple functions and low effects.
Speaker refers to a device that can convert audio signals into sound. In layman's terms, it means that the main speaker cabinet or the subwoofer cabinet has its own power amplifier. After amplifying the audio signal, the speaker itself will play back the sound to make the sound louder.
The speaker is the terminal of the entire sound system, and its function is to convert audio energy into corresponding sound energy and radiate it to the space. It is an extremely important part of the sound system and is responsible for the task of converting electrical signals into acoustic signals for direct listening by human ears.
The composition of the speaker:
The speakers on the market come in various shapes and colors, but no matter which one, they are composed of the two most basic parts of the speaker unit (called speaker unit in the terminology) and the cabinet. In addition, most speakers use at least two or more The speaker unit implements the so-called multi-channel crossover playback, so the crossover is also an indispensable part. Of course, there may be other components in the speaker, such as sound-absorbing cotton, inverted tube, folded "labyrinth pipe", ribs/reinforced partitions, but these components are not indispensable to any speaker, the most basic composition of the speaker The element has only three parts: speaker unit, cabinet and crossover.
Classification of speakers
The classification of speakers has different angles and standards. According to the acoustic structure of the speakers, there are airtight boxes, inverter boxes (also called low frequency reflection boxes), passive radiator speakers, and transmission line speakers. See their respective characteristics in detail. Related questions and answers. The inverter box is the mainstream of the current market; from the perspective of the size and placement of the speakers, there are floor-standing boxes and bookshelf boxes. The former is relatively large and is generally placed directly on the ground. Sometimes, shock-absorbing feet are also installed under the speakers. nail. Due to the large volume of the cabinet and the convenience of using larger and more woofers, the floor-to-ceiling box usually has better low frequency, higher output sound pressure level and strong power carrying capacity, so it is suitable for larger listening areas or more comprehensive requirements For occasions.
The bookshelf box is small in size and usually placed on a tripod. It is characterized by flexible placement and does not take up space. However, due to the volume of the box and the limitation of the size and number of woofers, its low frequency is usually lower than that of a floor box, carrying power and output sound pressure The level is also smaller, suitable for use in a smaller listening environment; according to the narrow bandwidth of the playback, there are wideband speakers and narrowband speakers. Most speakers are designed to cover the widest possible frequency band. , Belongs to broadband speakers. The most common narrow-band speakers are the subwoofers (subwoofers) that emerged with home theaters, which are only used to restore the ultra-low frequency to a very narrow frequency band; according to whether there is a built-in power amplifier, it can be divided into passive speakers and Active speakers, the former does not have a built-in amplifier and the latter has. At present, most home speakers are passive, but subwoofers are usually active.
Acoustics refer to other sounds besides human language and music, including sounds of natural environment, sounds of animals, sounds of machines and tools, and various sounds made by human actions. Audio probably includes a power amplifier, peripheral equipment (including compressor, effector, equalizer, VCD, DVD, etc.), speakers (speakers, speakers), mixer, microphone, display equipment, etc. add up to a set. Among them, speakers are sound output devices, speakers, subwoofers, and so on. A speaker includes three loudspeakers, high, low, and medium, three but not necessarily three. The development history of technology can be divided into four stages: electron tubes, transistors, integrated circuits, and field effect transistors.
Audio equipment probably includes power amplifiers, peripheral equipment (including compressors, effects, equalizers, exciters, etc.), speakers (speakers, speakers), mixers, sound sources (such as microphones, musical instruments, VCD, DVD) display devices And so on, add up to one set. Among them, speakers are sound output devices, speakers, subwoofers, etc. A speaker includes three types of speakers, high, low, and medium, but not necessarily three.
The sound principle of the speaker:
To know the principle of sound from speakers, we first need to understand how sound is transmitted. The transmission of sound requires a medium (vacuum cannot transmit sound); the sound space depends on all gases, liquids, and solids as a medium to spread out, and these substances as the medium of transmission are called media. It is like a water wave. If you throw a stone on a calm water surface, there will be a wave on the surface of the water, and then it will travel from the opposite shore to 4 weeks; sound waves are formed in this way. The frequency of sound waves is in the range of 20-20, 000 Hz, which can be heard by the human ear; below or above this range, the human ear cannot hear it.
The propagation mode of water waves and sound waves is the same. Through the propagation of the medium, the human ear can hear the sound.
Sound waves can propagate in gas, solid, and liquid
Let's talk about the working principle of the speaker. A horn is a device that converts electrical signals into acoustic signals. It is composed of coils, magnets, paper cones, and so on. The current (alternating current) output by the amplifier is moved by the coil under the action of the magnetic field. The coil is connected to the paper cone to drive the paper cone to vibrate, and then the vibration of the paper cone pushes the air to produce sound.