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Dolby TrueHD is a lossless audio codec used in Blu-ray contexts. It compresses digital audio originally represented as linear PCM so that decoding can reproduce the encoded PCM content without the information loss associated with lossy codecs. Whether your system can play a disc’s TrueHD track depends on the disc, player, receiver and connection.
What does “lossless” mean for Dolby TrueHD?
Dolby describes TrueHD as “100 percent lossless” and says the decoded audio is bit-for-bit identical to the master recording. More precisely, lossless describes the codec’s encoding and decoding of the audio data; it does not guarantee that every later step in playback preserves the signal unchanged. Downmixing, dialogue or dynamic-range processing, and other equipment behavior can affect what reaches the speakers.
Dolby defines TrueHD as a lossless coding system for digital audio originally represented as linear PCM. It is distinct from Dolby Digital Plus, which Dolby classifies as lossy. TrueHD is not simply a higher-bitrate setting of Dolby Digital Plus: Dolby identifies them as separate codecs with different coding approaches.
Sources: Dolby TrueHD; Dolby TrueHD Bitstream Guide; Dolby Digital Plus.
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What audio formats and capabilities does TrueHD support?
Dolby’s Blu-ray specifications describe these supported capabilities. They are format limits, not a description of every soundtrack encoded in TrueHD.
| Capability | Dolby’s stated specification |
|---|---|
| Full-range channels at 96 kHz/24-bit | Up to eight |
| Full-range channels at 192 kHz/24-bit | Six |
| Sampling-frequency range | 44.1–192 kHz |
| Word length | Up to 24 bits |
| Maximum bit rate on Blu-ray Disc | 18 Mbps; this is a ceiling, not a rate guaranteed for every soundtrack |
A TrueHD stream can also contain up to three separate mixes: 7.1-channel, 5.1-channel and two-channel stereo. Dolby describes support for dialogue normalization, dynamic-range control and downmix options. These are format and metadata capabilities; the specific mixes and options available to a viewer depend on how the title was authored.
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Source: Dolby TrueHD. Dolby does not state a publication date for these specifications on that page.
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How is Dolby TrueHD different from Dolby Digital Plus?
| Question | Dolby TrueHD | Dolby Digital Plus |
|---|---|---|
| Coding type | Lossless | Lossy |
| What that means | Decoding can reproduce the encoded PCM audio content without codec-related information loss. | Lossy coding does not preserve all of the original audio information. |
| Relationship between formats | A separate lossless codec used in Blu-ray contexts. | A separate lossy codec, not simply another name for TrueHD at a lower bitrate. |
The codec label alone does not establish which track will sound better in a particular setup. For a specific disc or system, check the available track, mix, playback support and signal path rather than inferring audible superiority from the format name.
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Sources: Dolby Digital Plus; Dolby TrueHD technical paper.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do you need to play a Dolby TrueHD track?
TrueHD has a documented Blu-ray use case. Compatibility is model- and title-specific, so verify the entire playback chain rather than assuming that a Blu-ray label alone guarantees TrueHD support.
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- Check the exact disc. Read its audio-track listing and confirm that the version or region you plan to play includes a Dolby TrueHD track.
- Check the player’s specifications. Confirm that the exact Blu-ray player model supports TrueHD playback and the relevant output behavior.
- Check the receiver’s specifications. If using an AV receiver, confirm that the exact model supports TrueHD and the channel setup you intend to use.
- Check the connection and settings. Consult the manuals for the player and receiver to confirm that your chosen connection and audio-output settings can pass or decode the track as intended.
- Confirm the selected track during playback. A disc may offer multiple audio tracks or mixes; select the TrueHD option if it is present and appropriate for your setup.
Dolby’s category pages identify Blu-ray players, discs and AV receivers within its product ecosystem, but they do not establish support for every model. The cited Dolby material also does not establish a universal rule about streaming-service availability or guarantee the signal path for any specific device.
Sources: Dolby TrueHD; Dolby TrueHD Bitstream Guide; Dolby Home Entertainment; Dolby Blu-ray.
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