49
Dolby Digital audio coding includes such consumer formats as DVD and
DTV. As with fi lm sound, Dolby Digital can provide up to fi ve full-range
channels for left, center, and right channels, independent left and right
surround channels, and a sixth (“.1”) channel for low-frequency eff ects.
Dolby Surround Pro Logic II is an improved matrix decoding technology
that provides better spatiality and directionality on Dolby Surround
program material; provides a convincing three-dimensional sound fi eld
on conventional stereo music recordings; and is ideally suited to bring
the surround experience to automotive sound. While conventional
surround programming is fully compatible with Dolby Surround Pro Logic
II decoders, soundtracks can be encoded specifi cally to take full advantage
of Pro Logic II playback, including separate left and right surround
channels. (This is also compatible with conventional Pro Logic decoders.)
Dolby Digital EX creates six full-bandwidth output channels from 5.1-
channel sources using a matrix decoder that drives three surround
channels from the two in the original recording. For best results, Dolby
Digital EX should be used with movie soundtracks recorded with Dolby
Digital Surround EX.
About Dolby Pro Logic IIx
Dolby Pro Logic IIx technology delivers a natural and immersing 6.1
channel listening experience to the home theater environment. A product
of Dolby’s expertise in surround sound and matrix decoding technologies,
Dolby Pro Logic IIx is a complete surround-sound solution that maximizes
the entertainment experience from stereo as well as 5.1 channel-encoded
sources.
