Multimedia speaker with new speaker unit
Due to the gradual popularization of LCD monitors, computer systems using these new devices have also put forward corresponding requirements for the volume of multimedia speakers, and some new speaker technologies have also entered the multimedia speaker industry. The most representative ones are NXT technology from the UK and aluminum ribbon speaker technology. The main feature of these technologies is that the speaker unit is particularly thin and does not require a speaker box, but their sensitivity is low (only about 80dB), and the power is not high enough. The frequency band is not wide enough, and the high and low frequencies of NXT products are not very good (about 200HZ for low frequencies and about 10KHZ for high frequencies). The medium and low frequencies of aluminum strip units are not very good (about 300HZ for low frequencies), but the medium and high frequencies are very good. Therefore, it is best to equip these speakers with subwoofers. With the advancement of technology, we believe that these shortcomings will gradually be improved. In Chapter 4, we will introduce the products and manufacturers in this area.
Multimedia speakers using new computer interface standards
USB is the abbreviation for Universal Serial Bus, which is a new generation interface for computers. Using USB, a personal computer can be connected in series with different USB devices. It supports hot swapping and its transmission speed is higher than current serial and parallel ports. The use of USB interface can effectively prevent electromagnetic pollution inside the computer, and also facilitate full software control (such as automatic shutdown without signal, automatic startup with signal, etc.). So it is simple and convenient to use, not affected by other devices, and has high efficiency and good results. The new generation of peripherals all support USB interfaces. In Chapter 4, several multimedia speakers using USB interfaces will be introduced.
Multimedia speaker using voice processing technology
This sound effect technology that simulates real environments is the Dolby surround sound technology proposed and implemented by the Dolby laboratory in the United States. Such technologies include: Dolby Directed Logic, Dolby AC-3 (DolbyDigital. Dolby Digital Logic), THX and dts. The multimedia speaker products using AC-3 technology include several products from manufacturers such as Innovation, Hisense, and Great Wall.
Multimedia speaker products using sound field simulation technology (including virtual simulation technology) are mainly used for the appreciation of DVD, VCD and other film and television software or among game enthusiasts, and users will have the same "immersive" feeling as cinemas. The above introduction is about multimedia speakers using real simulation technology. Multimedia speakers using virtual simulation technology are more common in the market (especially in the domestic market), but their usage effect is not very good. Therefore, from the perspective of development direction, the virtual sound field simulation technology built into multimedia speakers is not the direction (except for USB speakers), and the research direction is the virtual sound field processing technology built into sound cards. The innovative company's new generation sound card products all adopt sound field processing technology.
