DTS-HD Master Audio (DTS-HD MA; known as DTS++ before 2004[1]) is a multi-channel, lossless audio codec developed by DTS as an extension of the lossy DTS Coherent Acoustics codec (DTS CA; usually itself referred to as just DTS). Rather than being an entirely new coding mechanism, DTS-HD MA encodes an audio master in lossy DTS first, then stores a concurrent stream of supplementary data representing whatever the DTS encoder discarded. This gives DTS-HD MA a lossy "core" able to be played back by devices that cannot decode the more complex lossless audio. DTS-HD MA's primary application is audio storage and playback for Blu-ray Disc media; it competes in this respect with Dolby TrueHD, another lossless surround format. DTS-HD MA has enjoyed the greater share of this market since 2010,[2] with the notable exception of the TrueHD-encoded Dolby Atmos spatial surround format, which is more popular than DTS's competing DTS:X (encoded with DTS-HD MA).
DTS-HD Master Audio Suite v2.0
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DTS-HD MA is encoded in three steps. First, the audio master is fed to a DTS CA encoder, which generates the core (lossy) audio stream. Next, this lossy audio is decoded and compared to the master, with "residual" data being recorded wherever the two differ. Finally, the residual data is compressed losslessly and merged with the core into one bitstream. A DTS-HD MA decoder simply performs this process in reverse.[8]
Current HD remastered prints of Super Why! will be mixed and recorded in DTS-HD Master Audio for multi-dimensional 5.1 surround sound. The audio is made up to 6 channels. It will also be available soon for the first time ever in true 1080p High Definition on Blu-ray and Digital HD from PBS Distribution.
DTS-HD Master Audio is an extension of DTS' previous DTS Coherent Acoustics codec. Prior to 2004, it had been known as DTS++. Though it is an optional audio format for Blu-ray Disc format, by 2010, it had become the dominant Blu-ray lossless audio format over its competitor Dolby TrueHD. DTS-HD Master Audio is also the carrier for home delivery of DTS:X. Users can create DTS-HD Master Audio content using the DTS:X encoder suite, or the legacy DTS-HD Master Audio Suite.
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