Mono is a relatively primitive form of sound reproduction, and the early sound cards used it more commonly. When playing back monaural information through two speakers in a two-speaker system, we can clearly feel that the sound is transmitted from the middle of the two speakers to our ears. This kind of recording method that lacks a sense of position is naturally very backward from the current perspective, but when the sound card just started, it was already a very advanced technology.
The mono channel lacks the location of the sound, and the stereo technology has completely changed this situation. The sound is allocated to two independent channels during the recording process, so as to achieve a good sound localization effect. This technique is particularly useful in music appreciation. The listener can clearly distinguish the direction from which various instruments come from, which makes the music more imaginative and closer to the on-site experience. Stereo technology is widely used in a large number of sound cards since Sound Blaster Pro and has become an audio standard with far-reaching influence. To this day, stereo is still a technical standard followed by many products.
The basic concept of a quasi-stereo sound card is: use mono when recording sound, and sometimes the playback is stereo, sometimes mono. Sound cards using this technology have also been popular on the market for a while, but they have now disappeared.
People’s desires are endless. Although stereo sound satisfies people’s need to experience the position of the left and right channels.
Speaker system requirements, but with the further development of technology, everyone gradually found that the dual-channel has become less and less able to meet our needs. The appearance of PCI sound card has brought many new technologies, among which the most rapid development is three-dimensional sound effects. The main purpose of the three-dimensional sound effect is to bring people a virtual sound environment, through the special HRTF technology to create a sound field that tends to be real, so as to obtain better game auditory effects and sound field positioning. To achieve good results, only relying on two speakers is far from enough, so stereo technology appears to be stretched in front of three-dimensional sound effects, but four-channel surround audio technology solves this problem well.
Four-channel surround stipulates 4 pronunciation points: front left, front right, rear left, and rear right, and the audience is surrounded in the middle. It is also recommended to add a subwoofer to strengthen the playback processing of low-frequency signals (this is the reason why 4.1-channel speaker systems are widely popular today). As far as the overall effect is concerned, the four-channel system can bring the listeners surround sound from multiple different directions, can obtain the auditory experience of being in a variety of different environments, and give users a brand-new experience. Nowadays, four-channel technology has been widely integrated into the design of various middle and high-end speakers, becoming the mainstream trend of future development.
5.1 channel has been widely used in various traditional theaters and home theaters, some of the more well-known sound recording compression formats, such as Dolby AC-3 (Dolby AC-3)
Digital), DTS, etc. are all based on the 5.1 sound system. The ".1" channel is a specially designed subwoofer channel that can produce subwoofers with a frequency response range of 20~120Hz. . In fact, the 5.1 sound system comes from 4.1 surround, the difference is that it adds a center unit. This center unit is responsible for transmitting the sound signal below 800Hz, which is helpful to strengthen the human voice when watching the film, and concentrate the dialogue in the middle of the entire sound field to increase the overall effect. I believe that every friend who has really experienced Dolby and AC-3 sound effects will be impressed by the 5.1 channel.
Don't think that 5.1 is already the pinnacle of surround sound, and a more powerful 7.1 system has appeared. On the basis of 5.1, it adds two pronunciation points, center-left and center-right, in order to achieve a more perfect state. Due to the relatively high cost, it has not been widely used.