What are the types of sound systems in the car audio system：

Channel sound channel refers to the sound recording or broadcast in in different space range of collect or playback of independent audio signal, so channel number is recording the sound source number or playback corresponding to the number of speakers.
Sound card is supported by the sound track
Sound card support the channel number is a measure of the sound level is one of the main indicators, from mono to stereo latest coiled, below one introduces in detail:
Single channel Mono
Single channel is compared to the initial sound imitation form, the pre selection of the sound card throughout. When the two speakers play a single channel, we can feel that the sound is transmitted from the center of the two speakers to our ears. This lack of sense of direction of the recording method is very backward looking at nature, but in the sound card has just started, is now a very advanced skills.
Stereo Stereo
Lack of the sound of a single channel positioning, and the stereo skills will completely change the situation. Sound in the process of recording was assigned to the two independent channels, and then reached an excellent sound positioning effect. This skill is particularly useful in music appreciation, the audience can clearly distinguish the direction of a variety of musical instruments, and then make the music more imaginative, more close to the presence of feelings. Stereo skills are widely used in the future from the Blaster Pro Sound a lot of sound cards, become a far-reaching impact of an audio standard. Today, the stereo is still a lot of goods to comply with the technical standards.
Quasi stereo stereo Prospective
The basic concept of stereo sound card is: during the recording time sound selection of mono and playback is sometimes stereo, sometimes is a single channel. Use this skill card also in the popular market over a period of time, but now it has disappeared.
Four voice coil
Our desire is endless, stereo although satisfied us on the track of left and right sides range sense experience request, but follow the skills further, we gradually found two channel has become increasingly unable to our demand satisfaction. Because the PCI card has brought many new skills, which carry the most rapidly when the number of 3D sound. The purpose of three-dimensional sound effect is to bring us a virtual sound environment, after a special HRTF skills to build a real sound field, and then make a very good game sound effect and sound field positioning. To achieve good effect, just depends on the two speakers is far from enough, so stereo skills in front of the 3D sound it is more than sufficient, but four channel coiled audio skills is excellent processing the this problem.
Four channel 4 bit pronunciation rules around: front left, front right, rear left and right, the audience is surrounded by the center. Together with the idea of adding a low sound box, in order to enhance the playback of the low frequency signal processing (which is now the 4.1 channel speaker system is widely popular factors). On all the effect, the four channel system can bring listeners from a number of different direction of the voice coil, proximity to a variety of different environment of auditory feeling can be achieved, new experience to users. Now the four channel skills has been widely into various kinds of high-grade sound planning, become the mainstream trend in the future.
5.1 channel
5.1 channel has been widely used in all kinds of traditional cinema and home theater, compared with some famous sound recording tightening pattern, such as Dolby AC-3 (Dolby Digital and DTS are in 5.1 sound system is modeled on the skills, during the ". 1" channel is a specialized planning of ultra low sound channel, the channel can occur frequency response scale 20 to 120Hz super low. In fact, the 5.1 sound system from 4.1 coil, not the same is that it adds a central unit. The mid unit as transfer less than 80Hz sound signal, in appreciation of film is conducive to strengthen the voice, the dialogue and gathered in the middle of the sound to add all the effect. Trust every real experience AC-3 Dolby sound of the brothers will be 5.1 channels are convinced.
Do not think that now is the peak of 5.1 around the stereo, now 7.1 system stronger presents. It adds two points left and right pronunciation and on the basis of 5.1, in order to achieve more perfect. Due to the high cost, not widely spread.
7.1 channel
Briefly the effect of 7.1 channel system is establish a before and after field relative balance of sound field around the listener, to 5.1 channel sound, it on the basis of the original added after the sound field in the channel together, it is not the same in ordinary 6.1 sound track sound field, due to the dual rear midship 7.1 channel, and the double the maximum effect of mid is in order to avoid errors due to not sit in the emperor imperial throne but the sound field in the hearing of the listener. Because the human ear mercy two, then if you only after a mid horn, sound field will have an error, the error will sometimes form do you think sound is in contrast to the left, due to your left ear to receive sound, sometimes feel sound on the right, and sound field does not have stereo feeling, almost plane is very sound, the sound wrong. The reason is: when your ears are not facing the front of the point, you need two speakers to correct the phase difference, which is why listening to music to at least two speakers (stereo). So, the sound field and phase in two after the horn is coiled can build more high-end home theater configuration category.