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8 Technology Overview
Dolby Pro Logic Surround Sound
Dolby Pro Logic Surround Sound uses the standard analog stereo signal to
multiplex surround sound information, and requires a Dolby Pro Logic receiver/
amplifier to decode the signal. Pro Logic Surround Sound differs from Dolby
Digital Surround Sound by using the same audio signals for both the front and
back speakers on the left and right channels.
Supported File Formats
Besides playing standard DVD-Video discs inserted in a DVD-ROM drive, the
Wired 4DVD card can also play MPEG files in a variety of formats.
DVD
DVD files have various file extensions such as IFO and VOB. The VOB files
contain the actual video and/or audio data, whereas the IFO files contain
navigation information. DVD files are up to full CCIR601 resolution of 720 x 480
(576 for PAL) at 30 (25 for PAL) fps.
MPEG Files
MPG is the extension commonly used for files with MPEG-2 or MPEG-1
compressed full-motion video. System streams, Program streams, and Transport
streams are all supported, which are different ways of storing both audio and
video in one file. For MPEG-2 and MPEG-1 the video resolution is up to 720 x 480
(576 for PAL) at 30 (25 for PAL) frames per second with 16.8 million colors (full
CCIR601). These files may also include MPEG-compressed, AC-3 compressed, or
Linear PCM audio.
Elementary MPEG streams
The Wired 4DVD can also play MPEG encoded video-only bit stream and audio-
only bit stream files, as well as AC-3 elementary audio bit stream files. These are
typically files with the extensions .mpa, .mpv, .vbs, .abs, or .ac3.