Tektronix WVR8200 User Manual page 194

Monitoring audio
Usage notes
Basic listening modes
Pro Logic listening modes
174
Your instrument determines the downmix based on several parameters within
the Dolby metadata and the Dolby downmix selection. For example, if the
Dolby Audio Status screen shows Extended Bitstream information indicating
that the preferred downmix is Lt/Rt, the center channel is attenuated by -3 dB
and the surround channels are attenuated by -6 dB before they are combined
into the stereo downmix.
The listening modes can be used to monitor any multichannel Dolby Digital
audio program with a user-selectable number of channels. You can select
among several basic and Pro Logic listening modes, the descriptions of which
follow. Depending on the Channel Mode, these listening modes affect the
content displayed on the Audio display level bars. (See Table 6 on page 175.)
EX. Use EX if the two surround channels have been matrix encoded with a
back channel. If the EX listening mode is selected and there are two surround
channels present, the bar display adds two back channels, Lb and Rb, to create
a 7.1 channel display.
Full. Full does not modify the number of channels indicated by the channel mode
in either the display or the outputs.
3 Stereo. Use 3 Stereo to monitor the Dolby Digital signal with only the left,
center, and right channels. In this mode, if there are surround channels present,
they are mixed into the left and right channels with the surround mix level
attenuation.
Phantom. When using Phantom, the center channel, if present, gets attenuated
with the center mix level value and is then added into the left and right channels.
Stereo. Stereo always creates a Lo/Ro downmix using the center and surround
mix levels contained in the metadata. The Lfe is disabled.
Mono. Mono mode will always mix down to a single center channel, usually by
creating a Lo/Ro downmix and adding Lo to Ro. The Lfe is disabled.
Pro Logic listening modes perform different functions depending on what the
source material is. If the source is a Dolby Digital stream with three or more
channels, then a surround compatible Lt/Rt downmix is created and then decoded
into a selectable number of channels. If the source is a 2/0 Dolby Digital stream,
then these Pro Logic modes will do a Pro Logic decode to produce the number of
channels requested by the listening mode. If the source is PCM, then a full Pro
Logic decode is provided regardless of the specific Pro Logic mode selected.
Pro Logic Full. Pro Logic Full creates a Lt/Rt downmix of any input with three or
more channels. This Lt/Rt downmix will then be Pro Logic decoded to produce
a LCRS output where the surround channel is reduced 3 dB and reproduced in
both the Ls and Rs bars.
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