In short: the main difference is that the audio file of the DTS system has higher accuracy and capacity than the AC-3 system.
Dolby Digital Sound System Advantage1. Only the surround sound provided by Dolby Digital is the true stereo surround sound. The surround sound source is the independent and highly isolated two-channel stereo surround sound solved by the AC-3 decoder. It feeds the left rear (Ls) and right rear (Rs) surround speakers separately, giving the surround speakers the same stereo sound as the front main channel speakers. The sound behind the listener can be accurately positioned at a point in the rear sound field. The surround sound provided by Dolby Pro Logic is only a single source that is fed to the left rear and right rear speakers respectively. This rear surround sound reproduced by mono is only surrounded by lack of sense. Sound image localization and sound image movement. For example, when the 007 series action blockbuster "Golden Eyes" was first filmed, when the plane flew over from the reservoir dam from the left front to the rear, Dolby Pro Logic could simply identify the aircraft from going back and forth, and Dolby Digital However, it can be accurately determined that the aircraft is passing from the front left to the right rear. Another example is the Dolby Pro Logic system, which is difficult to reproduce the acoustics of a helicopter hovering around a room when the helicopter is hovering in the air in the film "The Desperate Island". In the Dolby Digital system, this sound effect can be reproduced very realistically, giving people a real sense of excitement, so that you can't help but look up or look down.
2. The frequency bandwidth of the surround channel in the Dolby Pro Logic system is only 1OOHz-7kHz, which greatly reduces the amount of information contained in the surround sound effect. The low frequency and high frequency in the background music are ruthlessly limited. Therefore, the actual sense of hearing is monotonous and dry, and the resolution and details of music are even more difficult to talk about. The frequency response of Dolby Digital's 5 channels is strictly designed according to AC-3 standard to 2OHz-2OkHz (+-5dB) or even wider, plus the specially designed subwoofer active subwoofer to help, almost It reproduces all the sounds in the audible range of the people within 360 degrees of the front, back, left and right, so that the whole sound field is more grand, the sense of direction and the sense of presence are more prominent. Because of this feature, it is absolutely impossible to meet the requirements of the Dolby Digital Surround System with small surround speakers (especially satellite speakers) with a narrow frequency range. Otherwise, the surround sound effect of the AC-3 system will definitely be greatly reduced.
3. Dolby Pro Logic's 4-channel isolation is very limited, generally only 3OdB, and it is best not to exceed 55dB. And Dolby Digital technology completely separates 5.1 channels, and its isolation is up to 1O5dB, which completely eliminates crosstalk interference between channels, makes the picture and sound more harmonious, the sound image is more accurate and prominent, and the scene is more realistic. Greatly improved the artistic appeal of the film.
4. Dolby Pro Logic Due to the limitation of analog technology, the decoded signal of the system often has a high noise level, which directly affects the dynamic response range of the whole machine, and greatly reduces the audible range. The Dolby Digital system has almost no background noise, a wide dynamic range, and the ability to easily reproduce an unbeatable violent explosion, while also playing a sound that is almost inaudible to the rain. The dynamic range of its sound is several times that of Dolby Pro Logic, and the Dolby Digital Surround system also allows users to change the width of their dynamic range as needed. For some friends whose housing conditions are narrower, the room is less soundproof, or they often like to enjoy the intense action movies in the middle of the night, they often have to listen to the big dynamic burst at a small volume. At this time, use the small volume setting function of Dolby Digital. The dynamic range of the whole machine can be reasonably compressed, and the low and medium level parts of the signal are still clear and full. In addition, you can choose the optimal mode according to the choice of large, medium or small speakers, and consider whether you want to connect the active subwoofer and the distance between the listening position and each speaker. Whether it is the size of the listening environment, the size of the speaker, the noisy day or the night of the night, we can adjust the sound of the whole machine to a very satisfying listening effect.
5. Dolby Digital has now been compatible with other audio systems, including Dolby Pro Logic Surround, 2-channel stereo and even mono systems. Since there is a pilot signal Pilot Tone for each program mode (mono, stereo, surround, etc.) in its "bitstream", this will allow Dolby Digital to automatically indicate this to you during work. The way and orientation of the program source can even compress the 5.1 channel audio content into mono and output it in cable broadcast or TV, thus solving a large number of program sources, greatly facilitating various users. Use, upgrade and interchange, because Dolby Digital has so many advantages, so when the DVD team was looking for an optimal audio coding technology, it was chosen as the two mandatory track formats in the CD product. one. That is to say, every DVD disc on the market must have two-channel PCM encoded audio tracks (compatible with CD) and Dolby Digital audio tracks, so Dolby Digital naturally becomes the mainstream audio source of today's home theaters. .
In addition, just like Dolby Digital, DTS requires a special decoder built into the player or AV amplifier, and your DVD player must also be the 3rd generation with DTS reading capability. In other words, “DTS Digital Out†must be indicated on the DVD panel. So if you already have a device with Dolby Digital, you don't have to feel outdated. However, if you are preparing to configure a home theater, you must pay attention to an AV amplifier and DVD player that can broadcast Dolby Pro Logic, Dolby Digital, and DTS. At present, there are several kinds of AV amplifiers with full compatibility decoding in the Chinese market. Generally, the Dolby Digital and DTS certification marks on the panel can be confirmed.
DTS is the abbreviation of "Digital Theatre System" and means "digital cinema system". Technically, DTS is completely different from other sound processing systems, including Dolby Digital. The so-called DTS audio track uses the 5.1 channel standard encoded by DTS (Digital Theater Systems). The maximum coded traffic of DTS is the same as LPCM, which is 48000*16*2=1536000bps=1536kbps per second. Relatively speaking, this is another popular multi-channel encoding system - 448kbps provided by Dolby Digital (AC3). In other words, DTS is much less distorted during the compression of multi-channel audio. . This feature makes DTS have an inherent advantage in multi-channel coding systems. Dolby Digital stores sound data between the perforations of motion picture film. Because of space constraints, a large number of compression modes must be used, so that part of the sound quality has to be sacrificed. DTS solved this problem in a simple way by storing the sound data in another CD-ROM and synchronizing it with the image data. In this way, not only the space is increased, but also the data traffic can be relatively large, and the CD storing the sound effect data can be replaced to play different language versions.
AC3 is Dolby Digital 2.0 (5), but only two channels have sound. In the Dolby Digital 5.1-channel system, the left (L), medium (C), right (R), left rear (LS), right rear (RS) independent directions of the 5 channels of output sound, in addition to A subwoofer channel, because its frequency range is only 1/10 of the standard channel, it is called 0.1 channel, 5.1 channel got this name. Listening to this kind of music will give you the feeling of being in the concert hall, feeling the direction and change of the sound, and feeling full of the scene. When playing DTS-encoded WAV, you need to change the WAV suffix to DTS. If you load the CUE file, change the CDImage.wav in the CUE file to CDImage.dts, and then you can use foobar to put the .DTS-CD. Just porting DTS technology to the CD. As for the DTS CD, as the name suggests, it is the audio Audio-CD of the DTS audio track. It is stored in the same way as a normal music CD, and is 16bits, 44.1kHz sampling frequency. Only the actual content recorded in the DTS CD is not the PCM sampled signal of the ordinary CD, but the DTS encoded track signal. Since the DTS CD file recording format is compatible with a normal CD, it can be copied, created and played in the same way as a music CD. Moreover, most DVD players and CD players with digital output function on the market support direct output of DTS digital signals, and DTS decoding devices already available in most audio enthusiasts or equipment stores, so that DTS can be enjoyed. The CD can be as arbitrary and convenient. DTS-CD generally comes in two sources, one is made by the record company using multi-track recording technology, and the DTS track of DVD is captured. The current DTS-CD is not a successful audio format. Because there are four more tracks than ordinary CDs, and the capacity is the same, it can be inferred that the quality of each track is definitely not as good as that of ordinary CDs, just pursuing a surround effect. . To play DTS-CD, use the 5.1 channel configuration, which is the usual AV home theater. The speakers are 2 main speakers (front) +1 center + 2 surround +1 subwoofers. Some cheap home theaters in the mall do not have a subwoofer, but it is ok. To play this format on a computer, you need WinDVD or PowerDVD, as well as a virtual CD-ROM software, or just play it on the disk, but the effect on the computer is generally not good, and few people configure 6-channel or even 8-channel on the computer. Speaker's.
DTS uses a 6-channel surround system, similar to Dolby, but also has a big difference with Dolby, and is used by many theaters like Dolby.
In theaters, Dolby records sound coding with movies, while DTS uses a separate CD to store sounds and uses a synchronization technique to align sound with images. At the same time, DTS stores the two backup channels together with the movie for use when there is a problem with the CD stereo.
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