DTS (company): Difference between revisions

DTS, Inc. was acquired by Tessera Technologies Inc. in December 2016<ref>{{Cite web |date=2016-12-01 |title=Tessera Completes Acquisition of DTS |url=https://www.businesswire.com/news/home/20161201005268/en/Tessera-Completes-Acquisition-of-DTS |access-date=2023-09-19 |website=www.businesswire.com |language=en}}</ref> and combined under the newly-created Tessera Holding Corporation. The combined company was renamed to [[Xperi]] Corporation in February 2017.<ref>{{Cite web |date=2017-02-22 |title=Tessera Holding Corporation Announces Name Change to Xperi Corporation |url=https://www.businesswire.com/news/home/20170222005478/en/Tessera-Holding-Corporation-Announces-Name-Change-to-Xperi-Corporation |access-date=2023-09-19 |website=www.businesswire.com |language=en}}</ref>

In theatrical use, a proprietary 24-bit [[time code]] is optically imaged onto the film. An LED reader scans the timecode data from the film and sends it to the DTS processor, using the time code to synchronize the projected image with the DTS soundtrack audio. The multi-channel DTS audio is recorded in compressed form on standard [[CD-ROM]] media at a bitrate of 882 &nbsp;kbit/s. The audio compression used in the theatrical DTS system (which is very different and completely unrelated to the home Coherent Acoustics-based DTS Digital Surround format) is the APT-X100 system. Unlike the home version of DTS or any version of Dolby Digital, the APT-X100 system is fixed at a 4:1 compression ratio. Data reduction is accomplished via sub-band coding with linear prediction and adaptive quantization. The theatrical DTS processor acts as a transport mechanism, as it holds and reads the audio discs. When the DTS format was launched, it used one or two discs with later units holding three discs, thus allowing a single DTS processor to handle two-disc film soundtracks along with a third disc for theatrical trailers. The DTS time code on the 35mm print identifies the film title which is matched to the individual DTS CD-ROMs, guaranteeing that the film cannot be played with the wrong disc. Each DTS CD-ROM contains a DOS program that the processor uses to play back the soundtrack, allowing system improvements or bug fixes to be added easily. Unlike Dolby Digital and SDDS, or the home version of DTS, the theatrical DTS system only carries 5 discrete channels on the CD-ROMs. The .1 LFE subwoofer track is mixed into the discrete surround channels on the disc and recovered via low-pass filters in the theater.

In addition to the standard 5.1-channel DTS Surround codec, the company has several other technologies in its product range designed to compete with similar systems from [[Dolby Labs]]. Those which conceptually extend DTS (to add more channels or more accurate sound reproduction) are implemented as extensions to a core DTS Coherent Acoustics data stream.<ref>{{cite web |url=http://www.dts.com/DTS_Audio_Formats/DTS_Audio_Formats/Overview.aspx |title=Audio Technologies & Software {{!}} Professional |archive-url=https://web.archive.org/web/20090721114216/http://www.dts.com/DTS_Audio_Formats/DTS_Audio_Formats/Overview.aspx |archive-date=2009-07-21 |publisher=DTS |access-date=2013-12-09 }}</ref> The core stream is compatible with DTS decoders which do not support the extension(s); the extension(s) provide the additional data required to implement the additional functionality.

'''DTS-HD High Resolution Audio''', along with DTS-HD Master Audio, comprise the DTS-HD extension to the original DTS audio format. It delivers up to 7.1 channels of sound at a 96&nbsp;kHz sampling frequency and 24-bit depth resolution. DTS-HD High Resolution Audio is selected as an optional surround sound format for [[Blu-ray Disc]], with constant bit rates up to 6.0 &nbsp;Mbit/s and 3.0 &nbsp;Mbit/s, respectively. It is intended to be an alternative for DTS-HD Master Audio where disc space may not allow it. DTS-HD High Resolution Audio is implemented as a core DTS stream plus an extension containing the two additional channels plus details to enable 96/24 sound reproduction.

DTS-HD Master Audio is selected as an optional surround sound format for [[Blu-ray Disc|Blu-ray]], where it has been limited to a maximum of 8 discrete channels. DTS-HD MA supports variable bit rates up to 24.5 &nbsp;Mbit/s, with up to [[5.1 surround sound|6 channels]] encoded at up to 192&nbsp;kHz or [[7.1 surround sound|8 channels]] and nine objects encoded at 96&nbsp;kHz/24 bit. If more than two channels are used, a "channel remapping" function allows for remixing the soundtrack to compensate for a different channel layout in the playback system compared to the original mix.

'''DTS Surround Sensation''': Previously known as DTS Virtual. It allows a virtual 5.1 surround sound to be heard through a standard pair of headphones.<ref>[http://investor.dts.com/releasedetail.cfm?ReleaseID=511228 DTS Stirs Surround Sensation(TM) at CES 2008] {{Webarchive|url=https://web.archive.org/web/20130522100740/http://investor.dts.com/releasedetail.cfm?ReleaseID=511228 |date=2013-05-22 }}, (January 7, 2008)</ref>

* '''DTS Interactive''': This is a real-time DTS stream encoder. On the PC, it takes multichannel audio and converts it into a 1.5 &nbsp;Mbit/s DTS stream for output. Because it uses the original DTS codec to transmit audio, fidelity is limited to 5.1 channel at 48&nbsp;kHz, 24bit. More than 5.1 channels, a higher sampling frequency or data rate are not supported, due to the lack of support for DTS variants such as DTS 96/24. It can also be found on some standalone devices (e.g. Surround Encoder). Nearly a dozen titles on the [[PlayStation 2]] feature the "DTS Interactive" real-time stream encoder, such as ''[[Grand Theft Auto: Vice City]]'' and ''[[Terminator 3: Rise of the Machines (video game)|Terminator 3: Rise of the Machines]]''.