(Dolby Digital AC-3) is a new-generation home theater multi-channel digital audio system developed by Dolby Corporation. Dolby Pro Logic is an analog system. Its four channels are decomposed from the two channels after encoding, so it is inevitable that it has the disadvantages of poor separation, low signal-to-noise ratio, lack of stereoscopic surround sound, and narrow band of surround sound. AC (Audio Coding) refers to digital audio coding. It abandons analog technology and adopts new digital technology.
Dolby AC-3 featuresThe surround sound system provided by Dolby Digital AC-3 consists of five full-frequency channels plus a subwoofer channel, so it is called 5.1 channels. The five channels include the front "left channel", "center channel", "right channel", rear "left surround channel" and "right surround channel". The frequency range of these channels is the full frequency domain response 3-20000Hz. The sixth channel, the subwoofer channel, contains some extra bass information, making some scenes such as explosions, impact sounds, and so on more effective. Since the frequency response of this channel is 3-120 Hz, it is called ".1" channel.
Dolby Digital AC-3 is a multi-channel surround sound coding system developed based on feeling. It divides the frequency of each sound into many narrow and small frequency bands according to the hearing characteristics of the human ear. During the encoding process, it is analyzed according to the principles of acoustic psychology to retain effective audio and delete multiple signals and various noise frequencies. , Make the reproduced sound more pure, the separation is extremely high.
The Dolby Digital AC-3 system can use the front left and right speakers, and the center speaker produces a very deep and well-defined sound field. It uses two rear or side surround speakers and ultra-low speakers to express a wide and magnificent The sound field, and the information of the six channels are all digitized during the production and restoration process, with little loss of information. The details of the whole frequency band are very rich, with true stereo.
Dolby Digital AC-3 has good compatibility. In addition to performing its own decoding, it can also serve for Dolby Pro Logic decoding. Therefore, all Dolby Pro Logic film and television software that has been produced so far can be reproduced using the Dolby Digital AC-3 system. Because the encoding of the Dolby Digital AC-3 system is very flexible, it has many formats. It is currently adopted by the United States as a high-definition television (HDTV) audio system, and the latest DVD player also includes Dolby Digital AC-3. Therefore, the Dolby AC-3 surround sound system may be a very promising technology.
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