Du Bi-directional logic ii

Working principle

Right Figure 1 gives the working principle of Dolby Orientation Logic II technology, which can handle any high-quality stereo (double channel) movies and music programs to There are 5 surround sounds of the full range channel. As a matrix surround decoding technique, Du Bi-directional logic II can identify the direction information naturally present in the stereo program, and use this information to bring five-channel surround play experience. Therefore, this technology is ideal for home theater systems, personal computers, gaming machines and multi-channel car audio (called Du Bi-directional logic II surround technology).

Du Bi-directional logic II Speaker Configuration

Right Figure 2 gives the speaker configuration diagram of Dolby Orientation Logic II technology, which can see the technical speaker configuration of the technology in the figure. A speaker. Du Bi-directional logic II Technique Design a servo (negative feedback) circuit to modulate 5 channel signals. A music mode is also designed, and the delay of each channel is optimized in this mode, and the user adjustable parameters are added, such as the width of the front stage. Du Bi-directional logic II also has a model for gameplay, Sony's PS2 gaming machine, Ren Hou's Wii TV game machine all uses one of the standards of digital interfaces as a digital interface. Du Bi-directional logic II coding technology has now become the standard of most home theater systems, even with ordinary two-channel playback, the audience will not feel the loss of key acoustic tracks.

Advantages

1. Du Bi-direction logical II technology brings new vitality to the CD record. By home theater system to play the music of the CD record, you will hear the sound effects of seminated and more deep sense and detail expressive. The technology will bring a new listening to the audience, just like listening to a replenished CD record.

2. In addition to strengthening the playback effect, Du Bi-directional logic II technology can also be used to encode TV shows, can play in 5.1 channel home theater systems, for thousands of The video tape and TV programs encoded in four Dolby provide optimal audio, bringing surround audio experiences to audiences with stereo television systems.

3. Du Bi-directional logic II is fully compatible with all Du Bi-directional logic technology, which also enables video game consoles to encode five-channel surround information into a sound signal, this There is almost no impact on the CPU of the game console, which means that these special sound will not slow the game.

Application Field

Dolby Surround Pro Logic II is a high degree of transition to any two-channel source Realistic and convincing five-channel surround sound listening experience. Users can be implemented as long as Dolby Digital 5.1 is selected in the driver menu and open the Dolby Pro Logic II. This technology has been widely used in all kinds of home theater systems and A / V receivers. The application cost of this technology is much lower than Dolby Number 5.1, and since only two audio signals are required to be used as a signal source, there is a wide range of uses in multimedia, especially the game.

Example

Current car audio application

According to Director Tang Yuan, director of the China Electronic Access Industry Association, foreign car users have begun to treat the car as a mobile In the entertainment venue, its car audio is to entertain in order to any time. The budget car and SUV multi-function cars in China's auto market have become mainstream, most of the young owners choose to promote their individuality through car audio, and the new generation of Dolby Laboratory's new generation is to achieve flow. Ideal for audio and video space. Right Figure 3 gives the arrangement of the departure audio, Dolby Lab has promoted various audio technology represented by Du Bi-directional logic II technology in 2001, which is to hope that the family theater is in the car. It is achieved in multiplication. Today, if the car is equipped with Dolby Orientation Logic II technology, Dolby Digital, MLP non-destructive compression (DVD-Audio) and Dolby Headphones can feel the same shocking effect as the cinema.

Superior Auto Audio Standard

China's "2003", "2003 Fengwen Vehicle" selection activities, the DuLVO (Volvo) XC90 sports and leisure cars will contain Du The audio of the proportional logic II (Pro Logic II) is used as its original configuration, which represents the development trend of car audio. At the same time, car audio enthusiasts can also find car audio and video products containing Dolby Orientation Logic II technology in the domestic auto audio rear market, including ALPINE PXA-H700, Pioneer's AVH-7550DVD And the DX-Z935 such as Clarion. In such a car sound boom, Dolby scraped the "surround sound" hurricane, introducing Chinese auto audio into the surround era.