Dolby True HD
Dolby TrueHD is an advanced lossless multi-channel audio codec developed by Dolby Laboratories which is intended primarily for high-definition home-entertainment equipment such as Blu-ray Disc and HD DVD. It is the successor to the AC-3 Dolby Digital surround sound codec which was used as the audio standard for DVDs. In this application, Dolby TrueHD competes with DTS-HD Master Audio, another lossless codec from DTS.
Dolby TrueHD uses Meridian Lossless Packing (MLP) as its mathematical basis for compressing audio samples. MLP was used on the earlier DVD-Audio format, but details of Dolby TrueHD and DVD-Audio differ substantially. A Dolby TrueHD bitstream can carry up to 14 discrete sound channels. Sample depths up to 24 bits/sample and audio sample rates up to 192 kHz are supported. Like the more common legacy codec Dolby Digital, Dolby TrueHD bitstreams carry program metadata. Metadata is separate from the coding format and compressed audio samples, but stores relevant information about the audio waveform. For example, dialog normalization and dynamic range compression are controlled by metadata embedded in the TrueHD bitstream. TrueHD is a variable bit-rate codec.
Read more about Dolby True HD: Blu-ray Disc, HD DVD, Transport
Famous quotes containing the word true:
“This was what you might call a bran-new country; the only roads were of Nature’s making, and the few houses were camps. Here, then, one could no longer accuse institutions and society, but must front the true source of evil.”
—Henry David Thoreau (1817–1862)