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Dolby Digital Plus is seeing increasing use in digital television systems, particular in cable and satellite systems, as a replacement for Dolby Digital. Many such applications do not take advantage of its higher channel count or ability to support multiple independent programs; instead it is used as a higher-efficiency codec than AC-3.
Dolby AC-3 (a backronym for Audio Codec 3, Advanced Codec 3, or Acoustic Coder 3), also known as ATSC A/52 (name of the standard) [18] or simply Dolby Digital (DD), is the common version containing up to six discrete channels of sound.
Any converter box converts the digital signal for the current digital sub-channel to an analog signal (at the reduced screen resolution of the analog standard), outputs that signal onto analog channel 3 or 4 (set by the user to avoid any conflict with local over-the-air channels) and sends that signal to the analog tuner on the TV.
Dolby Digital AC-3 is used as the audio codec, though it was standardized as A/52 by the ATSC. It allows the transport of up to five channels of sound with a sixth channel for low-frequency effects (the so-called "5.1" configuration).
When connected via component or D-Terminal cables, 1080p content is downscaled to 1080i or lower. [ 11 ] Output of Dolby Digital Plus , Dolby TrueHD , DTS-HD High Resolution Audio and DTS-HD Master Audio codecs , as well as multi-channel LPCM , is not supported on the Xbox 360 HD DVD player since the Xbox 360 itself does not support them.
The Dolby Laboratories recommendation for dialnorm has the force of law for US Digital Broadcasting, through the FCC's adoption of ATSC A/53 Annex B, section 5.5 Dialogue Level: "The value of the dialnorm parameter in the AC-3 elementary bit stream shall indicate the level of average spoken dialogue within the encoded audio program."
Some matrix encoding surround sound systems use a single back center channel surround (Dolby Digital EX, Dolby Pro Logic IIx 6.1) or a back left and back right (Dolby Pro Logic IIx 7.1) speaker configuration. Often the standard surround channels are misconceived to be "rear channels" when they are in fact meant to be placed at 90-120 degrees.
Cinema 5.1 surround formats include Dolby Digital and DTS. Sony Dynamic Digital Sound (SDDS) is an 8-channel cinema configuration that features 5 independent audio channels across the front with two independent surround channels, and a Low-frequency effects channel.
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