According to Dolby Labs, DD+ achieves compression ratios of around 4:1 (3.75:1, according to some sources). See Table 1 for more information about sound schemes, SPDIF, and HDMI handling for DD+. Black Friday deals: see all the best early offers right here.Those HD DVDs that supported DD+ invariably used 1.5 Mbps bitrates. Audio Bit Rate values can go as high as 6.144 Mbps for encoded data (this translates into 13.5 Mbps uncompressed), but might be either 1.5, 4.5, or 6.144 Mbps, depending on the bandwidth the studio decides to allocate to this type of audio track.Audio Fidelity data: the DD+ specification indicates it can be either 16 or 24 bits deep, and can be recorded at 44.1 kHz, 48 kHz (typical for DVDs and Blu-ray discs), or 96 kHz.
The Audio Channels (sound scheme) can appear as 5.1 (most typical) or 7.1 (unusual) the specification indicates it can support levels up to 13.1, but so far, 7.1 is as high as things go on commercial Blu-ray discs of any kind.But if a Blu-ray DD+ title were to appear, the entries would look something like this: In fact, the only movies we could find that indicated support for DD+ were recorded for HD DVD, such as A View From Space With Heavenly Music, Unleashed, and so forth. Only a very few Blu-ray movies claim to include DD+ encodings, and PowerSquid includes no listings in this category.
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