Extron Electronics SSP 7.1 User Guide - Manual (Page 69)

Dolby Digital Source Formats ( D)
Inputs 1- 4 only
Dolby Digital 5.1
(3/2.1, 3/2, 3/1.1, 3/1, 3/0, 3/0.1, 2/2.1, 2/2, 2/1.1, 2/1, 2/0.1, 2/0, 1/0.1, or 1/0)
Dolby Digital is a flexible, discrete, digital technology for carrying audio. Dolby Digital is a
5.1-channel surround sound format and is the standard for DVD video.
Dolby Digital features up to five discrete channels (front center, front left, front right,
surround left, and surround right), which gives it the “5” designation. Each of the channels
is full frequency with respect to human hearing (20 Hz to 20k Hz). There is an additional
channel reserved for low frequency effects (LFE), which is usually reserved for the subwoofer
speaker(s) or other speakers capable of reproducing low frequencies (3 - 120 Hz). This gives
the “.1” designation, since the sixth channel is not full frequency.
Although referred to as 5.1, it includes a variety of combinations, including 1.0, 2.0, 2.1,
3.0, 3.1, 4.0, 4.1, 5.0, and 5.1.
Dolby Digital 2/0
(2/0)
Dolby Digital 2/0 is a specific stereo format encoded by Dolby Digital technology. Encoded
information is intended primarily for playback by the front left and front right speakers. TV
broadcasts or DVD movie commentaries often have audio tracks encoded using this format.
When the SSP 7.1 detects this source format, both the D and 2-CH LEDs are lit.
Dolby Digital 2/0 Surround
(2/0)
Dolby Digital 2/0 Surround is the consumer version of the original Dolby multichannel analog
film sound format. Left, center, right, and mono surround are matrix-encoded onto two
audio tracks. These two tracks can be decoded by Dolby Pro Logic to recreate the original
four-channel sound. This source format is typically used for digital television broadcast
signals and older, remastered, movies.
When the SSP 7.1 detects this source format, both the D and 2-CH LEDs are lit.
Dolby Digital Surround EX
(3/2.1)
Dolby Digital Surround EX is a commercial format that reproduces the center channel
information through speakers placed directly behind the listener.
The back surround information is matrix-encoded onto the right and left surround channels
of conventional Dolby 5.1 formats. If there is no back channel speaker, the information for
that channel is played through the right and left surround speakers.
SSP 7.1 • Reference Material 63