Composition structure
The reason why the sound system can be called sound, the most basic condition is - the function of playing back the sound. In the audio system, at least the following points proposed by the author must be included in order to be called audio. This is true of any audio system, and car audio is no exception. Car audio mainly includes three parts: main unit, speaker and power amplifier. The mainframe is the most important part of the car's audio, just like the human brain, what kind of sound to make, is controlled by the brain. The popular host has RADIO host with broadcast receiving function, RADIO plus MP3 host, CD host, MP3 plus CD disc box, CD plus navigation host and CD/DVD/car MP5 host. MP5 host has replaced the general car CD sound system. Massive hard drive capacity has replaced traditional discs. Car MP5 has become the mainstream today.
2. Main classification
According to the geographical division of the car audio brand, it can be divided into Japanese brands and European and American brands. This is also a familiar classification, and home audio is often compared in this category.
The sound of the Japanese brand is known for its reading and modification of sound quality. Sound reading is the process by which the host acquires signals from digital and analog sources. The Japanese brand's audio technology is very mature, and the sound quality is pure and delicate. The modification of sound quality refers to the use of mathematical means to create various field effects to please the human ear, such as BBE, DHE, various field simulations, etc. These functions break the true color of the sound source, but it is more in line with the habit of the human ear, so very Please pleasing the consumer. In general, the sound quality of most Japanese audio is generally balanced, in line with the public's consumption.
The sound of European and American brands is known for its true reduction in power amplification and low shock. Europeans and Americans pay attention to the true nature of music, while some manufacturers pay special attention to bass. In the home audio, European and American brands of amplifiers and speakers are highly respected.
3. Technical points
There are five points to pay attention to in car audio technology, one is the installation size and installation technology, one is the suspension technology of the sound itself, one is the sound quality processing technology, one is the anti-interference technology, and the active application in the automotive field. Noise reduction technology.
Installation size and mounting technology
Most of the sounds on the car are installed in the position of the instrument panel or the sub-dashboard. The space inside these dashboards is relatively narrow, and the volume of the car audio host must be limited. Therefore, a universal mounting hole has been created internationally. The standard size is called DIN (German Industrial Standard) size. The standard DIN size is 178 mm x 50 mm x 153 mm (length x width x depth). Some of the more advanced car audio consoles have multi-disc CD audio and other devices, the mounting hole size is 178 mm × 100 mm × 153 mm, also known as 2 times DIN size, more common Japanese machine. The car with individual brands has a non-standard size, and can only be specified to install a certain type of car stereo. Therefore, to purchase car audio, we must pay attention to the size of the audio host and the size of the mounting hole on the instrument panel.
In addition to the mounting hole size of the instrument panel, the installation of the car audio is more important for the installation of the entire audio system, especially the installation technology of the speaker and the machine. Because the sound quality of a car is not only related to the quality of the sound itself, but also directly related to the installation technology of the sound.
Suspension technology
The vibration of the car is relatively large, and the installation technology of the sound system is to pursue high stability and high reliability. Therefore, the car audio has the following characteristics: the car tape playback part adopts the horizontal placement mode, and the upper and lower clamps are used to ensure stable sound reproduction; the high quality ceramic coated permalloy magnetic head ensures the sound quality and durability; CD Part of the multi-stage damping method requires absolute soldering of components on the board.
Sound quality processing technology
The sound quality of car audio has been developed towards digital technology. Advanced car audio with DAT digital audio, DSP (digital signal processor), MP3 technology, etc., formed a digital, logical, high-power Hi-Fi stereo system. In addition to the host configuration, the quality of the car audio is very important. Some people think that in general car audio, speakers should account for at least half of the total investment. Because the manufacture of high-quality speakers requires complex technology, the price is high, but the high and low-frequency effects it produces are often not achieved by ordinary speakers. Therefore, the speaker of the car stereo is generally more elegant, especially the multi-way crossover speaker.
The space of the car compartment is limited, and the car audio speaker is impossible to bring a large speaker. This requires the use of the instrument panel, the door, the rear partition and other components to be organically combined with the speaker to form a structure principle of the speaker. The superposition of sound waves. Of course, the installation position of the speaker often affects the sound quality of the car audio. The same pair of speakers will have different effects in different installation positions. Therefore, the installation position of the mid-to-high-end car audio speaker can be determined after various tests.
Anti-jamming technology
Car audio is in a very complicated environment. It is subject to electromagnetic interference from automobile engine ignition devices and various electrical appliances. In particular, all electrical appliances in the car use a battery, and will pass through power lines and other line pairs. The sound creates interference. The anti-jamming technology of car audio separately uses the choke coil to filter between the power supply and the sound. The space radiation interference is sealed by a metal casing, and the anti-interference integrated circuit is specially installed in the audio. Reduce external noise interference.
Active noise reduction
While people are constantly pursuing the sound quality of car audio, they also put forward higher requirements for the use environment of car audio. Some manufacturers have applied active noise reduction technology similar to noise reduction headphones to the environment of automobiles.
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