DTS (sound system)
DTS ( originally: Digital Theater Systems ) refers to a multi-channel sound system of the same California-based DTS, Inc., which is used both in cinema and Laser Discs, DVDs, Blu -ray discs, special audio CDs and on D -VHS for use, which, however, differ the versions for cinema and consumer technically fundamental.
- 3.1 Additional formats
History of development
The company DTS Inc. was founded in 1990 by the scientist Terry Beard and some investors. The first film, which was produced with DTS, was Jurassic Park (1993 ), which the company DTS supported with only five staff employed. Within six months 876 DTS systems were installed in cinemas worldwide. 1996 units were available for the consumer market that could play DTS for the first time.
Cinema
The DTS movie sound is depending on movie length to between one and three CD -ROMs and data reduced with APT -X100 at a data rate of 882 kbit / s The CD- ROM transmits five discrete channels. The LFE is not a separate channel, but is transferred to the surround channels. Playback side, the surround channels are divided at 80 Hz and distributed to the subwoofer and surround speakers.
Synchronizes the sound for the film by means of a time code (consisting of dots and dashes similar to a barcode) that is located between the optical sound track and the actual image, and is read with a small sampler. Since each image has its own timecode, the sound even with film tear or missing images will be tracked. Should turn the timecode or not legible, the sound for about six seconds the game continues from the CD before switching back to a backup source. This is usually the optical sound track (now usually Dolby SR ), but can also be another digital audio source such as Dolby Digital or SDDS depending on configuration.
The first DTS decoder had two CD -ROM drives, even newer than three, which expands the maximum overall length film to 300 minutes. A DTS system basically consists of a 386 PC with two or three SCSI CD-ROM drives as well as two special decoder cards.
Another development is the DTS - channel effect. This can be controlled via the time code, up to six effects devices ( strobes, fog machines, etc. ) can be controlled in the room. In the fall of 1997, the Rear Window Captioning became the film The Jackal presented system, a new addition to the DTS standard. This subtitles for the hearing impaired are included on the CD. These are then presented back of the hall mirror on a bright line. Who wants to read the Scriptures, can one ( from the movies provided ) mirrors hang on the seat of the person in front and read the subtitles.
Shortly after Dolby with Star Wars: Episode I 6.1 extension Dolby Digital Surround EX introduced, DTS, DTS-ES offered with a similar system. The theatrical versions of the extension are compatible as opposed to the home versions between the two manufacturers.
DTS can be retrofitted to all standard projectors. It is the only integrated digital audio system that is suitable for 70 -mm films. To play a scanner for 70 mm film must be fitted to the corresponding 70 - mm projectors only. In the commercial mainstream cinema plays the 70 -mm film format - even with the original magnetic sound - but no matter.
Recent Developments
In May 2008, DTS sold its cinema division to Beaufort California Inc., also known as Datasat Digital Entertainment.
Digital cinema according to the standard of the Digital Cinema Initiatives provides for the tone only uncompressed PCM, so that classical cinema sound systems like DTS or Dolby Digital are no longer needed there.
End-user system
DTS is marketed as an alternative to the Dolby Digital and used as the contention system, compressed audio data which are generated by a lossy process. The data rate used is Laser Discs and CD 1,235 kbit / s and DVD are up to 1509.75 kbit / s are possible, but these are rarely used.
The bit rate of DTS sound tracks on DVD video discs is either 754.5 or 1509.75 kbit / s The data rates are significantly higher than Dolby Digital. The soundtrack may contain an LFE channel that serves only responsible for the low frequency response subwoofer. The vollfrequenten channels range from 20 Hz to 22 kHz, the bass channel extends to 80 Hz (with Dolby Digital 5.1 up to 120 Hz). The encoding method used is called Coherent Acoustics.
In order to realize multi-channel audio on a CD, DTS - CD can be used.
Other formats
The DTS system for end users has been widely developed and added:
- DTS 5.1 discrete ( independent ) channels
- DTS -ES Discrete 6.1 - discrete ( independent ) channels
- DTS -ES Matrix 6.1 - Surround Back channel is from Surround -Left and Surround Right channel is calculated (see Dolby Digital EX )
- DTS NEO: 6 - multi-channel sound from a stereo signal is calculated (see Dolby Surround, Dolby Pro Logic II)
- DTS-96/24 - increased sampling frequency ( 96 kHz Quantization: 24-bit) for high quality sound playback of 5.1 channel sound.
- DTS-HD - High Definition format for use in HDTV as well as HD DVD and Blu -ray discs.