DTS (originally Digital Theater Systems) was founded in 1993 to compete with Dolby Labs for surround sound supremacy. DTS an audio compression technology, allowing movie makers to record surround sound that can be reproduced in cinemas as well as homes, deliver spine-tingling multi-channel sound. DTS is encoded at a higher bit rate and therefore is considered to be better quality. DTS has since released a plethora of more advanced surround sound formats including DTS-HD High Resolution, which supports up to 7.1 speaker channels. DTS has also brought out a lossless format, DTS-HD Master Audio. There's also DTS:X, which competes with Dolby's Atmos
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DTS stands for Digital Theater Systems. While Dolby Digitalis the standard 5.1 digital surround format on all DVD players, DTS is becominga possible alternative. DTS, first introduced in the movie Jurassic Park
DTSAudio CDor5.1 Music Discis an audioCompact Discthat contains music surroundsoundconfigurations.The specification permits discrete channel configurations - 2.0 (L, R) to 6.1 (L, R, C, LFE, Ls, Rs,Cs), although 5.1 (L, R, C, LFE, Ls, Rs. Physically, a DTS Audio CD conforms totheRed Bookstandard;however a DTS bitstream, is actually encapsulated in each PCM audio track. Thisconfiguration permits any non-DTS enabled player to output multi-channel audiowhen connected to an external DTS-compliant processor (e.g. a typical AVreceiver) via a digital interface like S/PDIF or HDMI, provided that the playerdoes not modify the bitstream internally.
Although the DTS audio track is read at the same fixedbitrate as 16-bit linear PCM (1,411 kbit/s) only 14 bits(1,234 kbit/s) are used for the encoded data stream; the remaining twobits are always zeros. This has the effect of attenuating the noise that wouldresult (by roughly 12 dB) should one attempt to play a DTS Music Disc witha non-DTS system, and thereby reducing the chance of speaker damage. Howeverthis is a non-issue for players with internal DTS decoders, such as someDVD-Audio and Blu-ray players; these devices will output a properly decodedaudio signal through their analogue ports.
Although all compliant DTS decoders support surroundconfigurations of up to 5.1 channels, a DTS ES decoder must be used to fullydecode discs with 6.0 or 6.1 channels of audio. DTS ES comes in twoflavors: DTS ES Matrix and DTS ES Discrete. Depending on the disc and decoderused the Cs (center surround) channel will either be derived from the Ls and Rsof a conventional 5.1 track via matrix decoding, or exist as a fully discretedigital extension to a 5.0 or 5.1 core. In either case, backward compatibilityis maintained with non-ES decoders.
SPDIF (Sony/Phillips DigitalInterconnect Format) - digital audio interface. SPDIF was first used only totransmit stereo 16-bit PCM data (CD player was the only source of digitalaudio). It is very straightforward: audio samples are transmitted at constantfrequency, one-by-one (and bit-by-bit) in 32-bit blocks where 8 bits are usedfor synchronization and some side info and 24 bits are used for sample. In mostcases, only 16-bit transmission is supported (CD carries only 16-bit sound) andlow 8 bits of a sample are always zeroed. This interface is very simple andcheap and so it became widespread.
Therefore, when multi-channel soundera came to home theaters, SPDIF was an ideal candidate for digital interfaceto transmit multi-channel sound. However, it is a problem: current interfaceimplementations work only with stereo sound, but now it is required to transmitup to 6 channels (or 8 channels at present). It was decided not to change theinterface but to transmit compressed multi-channel sound instead of PCM data(for digital interface it does not matter what to transmit). So receiver mustrecognize compressed data and decode it. For this purpose a new standard wasintroduced (IEC 61937) that describes how compressed data must be transmittedand how receivers can distinguish PCM and compressed data.
PCM data transmission mode and
Unless noted we well use SPDIFtransmission, SPDIF output mode and SPDIF stream terms only for encoded streamsafterwards.
Compressed data may be transmittedover SPDIF instead of PCM data. Therefore, we can prepare a CD disk and placecompressed AC3 or DTS data instead of usual PCM tracks. When we playback thisdisk with a CD player connected to a receiver we will get true multi-channelsound!
But this trick does not work with analog connection andportable CD players: we will get terribly loud noise instead of nice music.Because of this CD disks with AC3/DTS tracks are relatively rare.When a mediaplayer tries to playback a multi-channel disk it does not know that it containscompressed data. It's just because it is no simple method to distinguish usualand multi-channel disks. We have to read some data from the disk and have somemethod to know what kind of data we got. Hardware receivers have a specialdetection circuit, but software media players (most of it) have no. That's thepoint why media player cannot playback such discs right even when some AC3 orDTS decoder is installed.
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DTS CDsare encoded in 5.1 surround sound using the DTS compression algorithm. As such,the fidelity is of lower quality than the sound quality offered by CDs,DVD-Audio discs, and SACDs. DTS CDs are not encoded in stereo. We can play DTSCDs in three ways:
- On a CD playerconnected to a 5.1-channel receiver or pre/pro with a DTS decoder via an optical or coaxial digital cable.
- On a DVD-Video player with the 'DTS Digital Out' logo on the frontpanel (meaning any player available today) to a 5.1-channel receiver or pre/prowith a DTS decoder via an optical or coaxial digital cable.
- On a DVD-Videoplayer with a built-in DTS decoder connected to a 5.1-channel receiver orpre/pro via the 5.1-channel outputs (i.e., six RCA cables).- On a DVD-Video player with the 'DTS Digital Out' logo on the frontpanel (meaning any player available today) to a 5.1-channel receiver or pre/prowith a DTS decoder via an optical or coaxial digital cable.
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SONY DVD COMBO Players: