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The maximum bitrate of an audio stream including metadata is 18 Mbit/s (instantaneous, since it is variable bitrate), and a TrueHD frame is either 1/1200 seconds long (for 48000 Hz, 96000 Hz or 192000 Hz) or 1/1102.5 seconds long (for 44100 Hz, 88200 Hz or 176400 Hz). In the Blu-ray Disc specification, Dolby TrueHD tracks may carry up to 8 discrete audio channels ( 7.1 surround) of 24-bit audio at 96 kHz, or up to 6 channels ( 5.1 surround) at 192 kHz. In addition, Dolby Atmos, a multi-dimensional surround format encoded using Dolby TrueHD, can embed more advanced metadata to spatially place sound objects in an Atmos-compatible speaker system. Dolby TrueHD metadata may include, for example, audio normalization or dynamic range compression. Like its predecessor, Dolby TrueHD's bitstream carries program metadata, or non-audio information that a decoder uses to modify its interpretation of the audio data. A Dolby TrueHD audio stream varies in bitrate, as does any other losslessly compressed audio format.
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Dolby's compression mechanism for TrueHD is Meridian Lossless Packing (MLP) prior to Dolby TrueHD, MLP was used for the DVD-Audio format, although the two formats' respective implementations of MLP are not mutually compatible. The Dolby TrueHD specification provides for up to 16 discrete audio channels, each with a sampling rate of up to 192kHz and sample depth of up to 24 bits. Dolby TrueHD competes with DTS's DTS-HD Master Audio (DTS-HD MA), another lossless surround sound codec.
#DTS HD MA VS DOLBY TRUEHD PLUS#
Dolby TrueHD, along with Dolby Digital Plus and Dolby AC-4, is one of the intended successors to the Dolby Digital (AC-3) lossy surround format. Dolby TrueHD is a lossless, multi-channel audio codec developed by Dolby Laboratories for home video, used principally in Blu-ray Disc and compatible hardware.