Difference between revisions of "DTS-HD"
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'''DTS-HD''' is a family of audio [[codec|codecs]], primarily used in Blu-ray and HD-DVD – optionally, competing with the Dolby codecs family. It is an extension of the older [[DTS|DTS Coherent Acoustics]] codec found in DVDs, and maintain compatibility with devices that only support those. | '''DTS-HD''' is a family of audio [[codec|codecs]], primarily used in Blu-ray and HD-DVD – optionally, competing with the Dolby codecs family. It is an extension of the older [[DTS|DTS Coherent Acoustics]] codec found in DVDs, and maintain compatibility with devices that only support those. | ||
| − | * '''''DTS-HD Master Audio''''', previously known as DTS++, provides for lossless audio. It is a [[hybrid codec|hybrid lossless/lossy]] codec with a "core" DTS CA stream, for devices only supporting that format, and a correction stream | + | * '''''DTS-HD Master Audio''''', previously known as DTS++, provides for lossless audio. It is a [[hybrid codec|hybrid lossless/lossy]] codec with a "core" DTS CA stream, for devices only supporting that format, and a correction stream specified in the DTS "Lossless Extension". DTS-HD devices will decode both to reconstruct the signal losslessly. In Blu-ray it supports streams up to 192/24 at 5.1 surround, and up to 96/24 at 7.1 surround. |
* '''''DTS-HD High Resolution''''' works a similar way with an extension stream, but is a lossy codec working at 6 kbit/s or 3 kbit/s constant bit rates (for use when disc space is a constraint). For example, the core stream can be 5.1 at 48 kHz sampling rate, and the extension stream can contain the additional two channels – and even doubling the sampling rate for the extra (inaudible!) ultrasonic octave. | * '''''DTS-HD High Resolution''''' works a similar way with an extension stream, but is a lossy codec working at 6 kbit/s or 3 kbit/s constant bit rates (for use when disc space is a constraint). For example, the core stream can be 5.1 at 48 kHz sampling rate, and the extension stream can contain the additional two channels – and even doubling the sampling rate for the extra (inaudible!) ultrasonic octave. | ||
| − | The above description is incomplete. | + | The above description is incomplete. In particular, the DTS-HD codec suite offers configurations not found in Blu-ray: The "Lossless Extension" (XLL) can operate as an ordinary lossless audio codec without core stream, sacrificing backwards compatibility. Also the DTS suite offers a ''Low Bitrate'' codec / coding profile that can encode 5.1 surround down to 192 kHz sampling rate, intended for streaming purposes when bandwidth is constrained. |
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| − | For additional information: Wikipedia or the [https://wiki.multimedia.cx/index.php/DTS-HD Multimedia Wiki entry]. | + | For additional information: Wikipedia or the [https://wiki.multimedia.cx/index.php/DTS-HD Multimedia Wiki entry] with link to the specification. |
Latest revision as of 10:47, 14 April 2024
DTS-HD is a family of audio codecs, primarily used in Blu-ray and HD-DVD – optionally, competing with the Dolby codecs family. It is an extension of the older DTS Coherent Acoustics codec found in DVDs, and maintain compatibility with devices that only support those.
- DTS-HD Master Audio, previously known as DTS++, provides for lossless audio. It is a hybrid lossless/lossy codec with a "core" DTS CA stream, for devices only supporting that format, and a correction stream specified in the DTS "Lossless Extension". DTS-HD devices will decode both to reconstruct the signal losslessly. In Blu-ray it supports streams up to 192/24 at 5.1 surround, and up to 96/24 at 7.1 surround.
- DTS-HD High Resolution works a similar way with an extension stream, but is a lossy codec working at 6 kbit/s or 3 kbit/s constant bit rates (for use when disc space is a constraint). For example, the core stream can be 5.1 at 48 kHz sampling rate, and the extension stream can contain the additional two channels – and even doubling the sampling rate for the extra (inaudible!) ultrasonic octave.
The above description is incomplete. In particular, the DTS-HD codec suite offers configurations not found in Blu-ray: The "Lossless Extension" (XLL) can operate as an ordinary lossless audio codec without core stream, sacrificing backwards compatibility. Also the DTS suite offers a Low Bitrate codec / coding profile that can encode 5.1 surround down to 192 kHz sampling rate, intended for streaming purposes when bandwidth is constrained.
Open source DTS-HD decoders are available through FFmpeg and libdca (used by VideoLAN/VLC). The Matroska container format supports DTS-HD.
For additional information: Wikipedia or the Multimedia Wiki entry with link to the specification.
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