DTS, Dolby 2.0, Dolby 5.1, AC3

DTS is short for "Digital theatre System", which means "Digital Cinema System. Technically, DTS is completely different from other sound processing systems, including Dolby Digital. Dolby Digital stores audio data between the tooth holes of the film. Due to space limitations, it must adopt a large number of compression modes, so it has to sacrifice part of the sound quality. DTS solved this problem with a simple method, that is, storing audio data in another CD-ROM to synchronize it with image data. This not only increases the space, but also increases the data traffic. You can also change the CD for storing audio data to play different language versions.
AC3 means that Dolby Digital 2.0 (Dolby 2.0) is also 5 channels, but only two channels have sound.
In the Dolby Digital 5.1 audio channel system, left (L), center (C), right (R), left rear (LS), and right back (RS) are used) in addition, there is an ultra-heavy and sub-woofer sound channel, which is called 1/10 sound channel because its frequency range is only 0.1 of the Standard Sound channel. Listening to this kind of music will make you feel like you are in the concert hall. You can feel the direction and change of your voice, and you will feel the scene.
change dimensions to cdimage. DTS, and then you can use foobar to put it. DTS-CD only transplanted DTS technology to CD, DTS-CD generally has two sources, one is the recording company with multi-track recording technology manufacturing, in addition, the DTs audio tracks of the DVD are captured. The current DTS-CD is not a successful audio format, because than the ordinary CD more than four audio tracks, and the capacity remains unchanged, can infer that the quality of each audio track is certainly not as good as ordinary CD, it's just about pursuing a surround effect. Play DTS-CD to use the configuration of 5.1 channels, that is, the usual AV home theater, the speaker is 2 main speaker (Front) + 1 center + 2 surround + 1 subwoofer. Some cheap cinemas in the mall do not carry off-frequency sound cannons. Windvd or powerdvd are required for playing the video on the computer, as well as the virtual optical drive software, or play the video on a dial. However, the effect on the computer is generally poor, few people configure 6-or even 8-channel speakers on their computers.

AC3 is a traditional audio standard developed by the Dolby lab. It is designed for cinemas. In the past, the sound of a movie was recorded between the tooth holes of the film, and AC3 was no exception. But that is not enough, so AC3 adopts the compressedAlgorithm. Later, Pioneer cooperated with Dolby to improve AC3 standards so that it could support 5.1 channels. AC3's data traffic (that is, the audio bit rate) is 384 kbps. It is also compatible with two-channel stereo and single-channel systems. AC3's two-channel bit rate is only 128 Kbps, this is actually the audio data bit rate of MP3. The most detailed AC3 standard, with a bit rate of 448 kbps, is widely used as the storage standard for movie audio because of its reasonable compression and small size.

Data transmission (Digital theater systems) was jointly launched by global Film Corporation and data transmission Corporation. it cleverly avoided the problem of using film to store sound and switched to CD to store it separately, synchronous playing of sound during video playing, also supports 5.1 channels. Of course, sound data must be compressed, but after all, it is more generous. The bit rate can be divided into two types: full code rate 1509 kbps and half code rate 754kbps, even if it is a half code rate of 754k, it is nearly twice higher than the highest AC3 standard. In this way, the voice distortion rate is smaller and clearer. For full-code DTS data, let's take a simple calculation. Taking a 90-minute standard movie as an example, it requires 1018575 or 1 GB of data space. To avoid occupying too much image space, therefore, DTS's usage in D5 is not high, and even D9 is only used in some movies.
People are less sensitive to sound than images. in medicine, the auditory system is not as complex as the visual system. The human brain has 2/3 of its functions to recognize images. If there is no suitable device and direct comparison, then the well-made Ac3 and DTS do not sound very different.

Link: http://hi.baidu.com/jinglin178/blog/item/b91a766065f2f942eaf8f862.html