Dolby AC 3 comes from Dolby Laboratories founded by Dr. Dolby in 1965. He started with the development of a tape recording noise reduction system. After more than 40 years of development, Dolby Laboratories has become a leading enterprise in the acoustics industry. The products affect the entire industrial chain of the acoustics industry, and drive the entire industry through its research and development results. The development of the industrial chain. Since the advent of multichannel technology, Dolby Laboratories has dedicated itself to the research of surround sound. In 1975, Dolby Lab invented Dolby stereo technology for movie soundtracks. In 1987, Dolby Orientation Logic came into being around Lu, which has been popular in the world for more than ten years. However, due to the limitations of analog technology, its sound effects are still not perfect. In 1994, Japan Pioneer Corporation and Dolby Experimental Beijing jointly developed a brand new digital multi-channel video and audio system, and named it Dolby AC 3 ". In early 1997, Dolby Laboratories officially adopted Dolby AC-3 Surround sound was renamed Dolby Digital (CDolbySuroundDigital), referred to as DolbyDigtai. AC3 was originally developed for use in movie theaters, because the space on the film is limited, so AC3 sound data is stored in the perforations and perforations on the film Because this part of the space on the film is too small, the engineers of Dolby Lab use the listening characteristics of human psychoacoustics to be sensitive to high-level sounds, while shielding other insensitive sounds. Lossy compression of the sound of each channel to save space. Dolby Laboratories uses this horizontal jade shrinking technology to put the completely independent front left L). Front right R), center (C), left surround (La), right surround (Rs) and subwoofer (S) large channels (5.1 channels) are down-coded into two channels, which are recorded on film or video discs. All digitized during the production and restoration process, so there is little loss of information, more detailed details, and stronger stereo effects. At the same time, Dolby AC3 has good compatibility. In addition to its own decoding, it can also be used for Dolby. Directional logic decoding service.
DTS technology is an audio format developed by Deli Bellegger in the United States Digital Cinema System (DTS) company, which was created in January 1993. It can also be said to be a scatter audio processing technology. In order to solve the problem of frequent reading errors when writing digital sound signals directly into film, DTS was ingenious. They decided not to put digital sound signals directly on the film, because that was too much restriction, but only recorded on the stock The time code is then based on this time code. Simultaneously play the CD-ROM that records the sound, so that the sound of the movie and the face can be synchronized. In this way, the data space for recording Lu Yin has expanded many times, providing technical advantages for the high-quality sound effects of the DTS system. It has been highly valued by major directors Spielberg and Universal Pictures, and was first applied to In the classic sci-fi block Paul Ji Park, its breathtaking surround sound effects and superb real-world stunt productions conquered the audience, making the film one of the most realistic movies ever.
As a veteran audio giant, Shebi Digital has long been indestructible. DTS has attracted attention as a new favorite in the industry, and it has a tendency to become the top. The coexistence and development of the two have brought us more space for choice. Dolby AC-3 and DTS are not rivals fighting each other, and the existence of one does not pose a fatal threat to the other because they each have their own strong technical advantages. Under strong circumstances, people may care who is better, but in fact it is very difficult to make comparisons and judgments.
Dolby AC 3 is a multi-channel surround sound coding system developed on the basis of feeling. It divides the frequency of each sound into many narrow and small frequency bands according to the noisy 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 unnecessary signals and various noise frequencies. , Make the reproduced sound more pure, the separation is extremely high.
The AC-3 system can use the front left and right speakers, and the center speaker produces a deep sense of sound and a well-defined sound field. It uses two rear or side surround speakers and ultra-low speakers to express a wide and magnificent sound. Field, and the information of the six channels is completely 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 AC 3 has good compatibility. In addition to performing its own decoding, it can also serve for Dolby directed 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 AC 3 system is very flexible, it has many formats. It has been adopted by the United States as a high-definition television (HDTV) audio system. The latest DVD players also include Dolby Math AC-3. Therefore, the Dolby AC-3 surround sound system may be a very promising technology.
The advantage of DTS over Dolby AC-3 is that its compression is relatively small (Dolby AC 3 is 12: 1, DTS is 3: 1), of course, the data transmission rate is also more DTS ( Dolby AC-3384Kbis seconds, DTS1411Kbits seconds), as for the difference in sound quality, DTS said their sound quality reached the level of 20-bit resolution, while Dolby AC 3 is equivalent to 16-bit CD records.
Obviously, DTS has a lower compression rate, a higher data transmission rate and a higher number of bits, all of which point to a richer amount of information and historical sound quality. What is the actual situation? The sound quality of DTS is obviously more detailed than that of Dolby AC 3. Some improperly adjusted Dolby AC-3 systems have no stimulus high frequencies that appear easily, and the reproduction of details is the strength of DTS. It is obvious that it is not ideal.
However, since both Dolby Digital and DTS use psychoacoustic principles to encode sound tracks, traditional noise and distortion measurements cannot indicate which system has better performance and the only way to determine which system has better performance It is listening test. There are auditory differences between the DTS version and the Dolby AC-3 version. These differences may be due in part to the differences between the social digital processing technology and the DTS processing technology. At present, Pu You can see that the low frequency part of the DTS encoding at about 60 Hz may be slightly inferior, and the effect of the midrange and each vocal is better. However, the difference that people can hear is quite small, especially for multi-channel systems. Perhaps a fairer statement is that the two are very close opponents. In some cases, people may prefer the effect of Dolby AC-3, and in some cases they will prefer the effect of DTS.
Now, with the next-generation high-definition disc battle ended. As the industry's standard setters, Dolby Experimenter and DTS, in the era of high definition, they have launched a new generation of audio standards Dolby TrueHD and DTS-HD. They will launch a new round of competition in the next generation of lossless compression technology.
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