Extron electronics SSP 7.1 User Manual page 67

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Dolby Pro Logic II/IIx Movie or Music
Dolby Pro Logic II builds on Dolby Pro Logic by breaking the mono surround channel into a pair
of stereo surround channels for playback in a 5.1 surround sound setup. This is achieved by a
matrix surround decoder.
Dolby Pro Logic II works only with two-channel source formats that are used in a 5.1
configuration. It is available as Dolby Pro Logic II Movie and Dolby Pro Logic II Music.
Dolby Pro Logic II Movie is used for VCRs, TV broadcasts, and all programs encoded in Dolby
Surround. Dolby Pro Logic II Music is used for any stereo music recordings.
Dolby Pro Logic IIx Movie and Music extend the Dolby Pro Logic II matrix decoding technology to
derive up to seven channels from two-channel or multichannel sources, which provides additional
outputs for surround back channel effects.
Both the Movie and Music modes produce up to seven full bandwidth matrixed channels. Music
mode has hard back effects (shared across all surround speakers) instead of just the back
speakers, which the Movie mode has.
Dolby Pro Logic II/IIx Music mode provides an additional set of commands to tailor the sound to
individual listening tastes.
Dimension control
This alters the ratio of L+R to L-R for two-channel input signals. This has the effect of adjusting
the sound field towards the front or towards the back, making the sound more or less spacious.
Center Width control
Pro Logic decoding produces a single center signal that comes from the center speaker. If there
is no center speaker, a "phantom" center image is produced that is split between the right and
left speakers. Center Width control allows variable adjustment of the center image so it is heard
only from the center speaker, only from the right and left speakers, or from all three speakers in
varying degrees.
Panorama control
This extends the Center Width control, so that all or part of the center image can be heard from
the surround speakers for a "wraparound" effect.
Dolby Digital Pro Logic IIx Movie or Music
Both Dolby Digital Pro Logic IIx Movie mode and Dolby Digital Pro Logic IIx Music mode build on
the Dolby Pro Logic IIx matrix mixing technology to create two additional surround back channels
(right and left back) from the original Dolby Digital 5.1 channel information. The Dolby Digital Pro
Logic IIx Movie mode (applied to multichannel sources) uses the same Dimension, Center Width,
and Panorama controls that are available for Dolby Pro Logic IIx Music mode (applied to stereo
sources). For more information, see the section above.
NOTES:
This listening mode is only available when the SSP 7.1 is set up for 6.0 to 7.1 channel
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outputs and a multichannel Dolby Digital source format is present.
Dolby Pro Logic IIx Movie and Dolby Digital EX are electronically equivalent when the
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system is set up for 6.1.
DTS + Dolby Pro Logic IIx Movie or Music
This mode uses Dolby Pro Logic IIx matrix mixing effects to create up to two additional surround
back channel effects from the original 5.1 information of a DTS Digital Surround source format.
Both the Movie and Music modes produce up to seven full bandwidth matrixed channels for right
and left back surround.
NOTE: This listening mode is available only when the SSP 7.1 is set up for 6.0 to 7.1
channel outputs and a DTS Digital Surround source format is present.
SSP 7.1 • Reference Material 59