Grass Valley Imagestore 750 v.3.0.1 User Manual
Page 145
129
Imagestore 750
User Manual
•
‘Preferred Down-mix Mode’
The preferred stereo down-mix mode setting indicates the type of stereo down-mix pre-
ferred by the mastering engineer. This information may be used by the Dolby Digital (AC-3)
decoder to configure the type of stereo down-mix automatically, but can also be overridden
or ignored. Choices include the following:
•
Not indicated.
•
Lt/Rt down-mix preferred.
•
Lo/Ro down-mix preferred.
Note: For information on down-mix options, see
on page 115.
•
‘Lt/Rt Center Mix Level’
This setting indicates the nominal down-mix level of the center channel with respect to the
left and right channels in a Lt/Rt down-mix. Choices include the following:
•
1.414 (+3.0
dB)
•
1.189 (+1.5
dB)
•
1.000 (0.0
dB)
•
0.841 (–1.5
dB)
•
0.707 (–3.0
dB)
•
0.595 (–4.5
dB)
•
0.500 (–6.0
dB)
•
0.000 (–inf dB)
Note: The meaning of this field is defined as described only if the audio coding mode is
3/0, 3/1 or 3/2. If the audio coding mode is 1/0, 2/0, 2/1, or 2/2 then the meaning of this
field is reserved.
•
‘Lt/Rt Surround Mix Level’
This setting indicates the nominal down-mix level of the surround channels with respect to
the left and right channels in a Lt/Rt down-mix. Choices include the following:
•
0.841 (–1.5
dB)
•
0.707 (–3.0
dB)
•
0.595 (–4.5
dB)
•
0.500 (–6.0
dB)
•
0.000 (–inf dB)
Note: The meaning of this field is defined as described only if the audio coding mode is
2/1, 3/1, 2/2 or 3/2. If the audio coding mode is 1/0, 2/0 or 3/0 then the meaning of this
field is reserved.
•
‘Lo/Ro Center Mix Level’
This setting indicates the nominal down-mix level of the center channel with respect to the
left and right channels in a Lo/Ro down-mix. Choices include the following:
•
0.841 (–1.5
dB)
•
0.707 (–3.0
dB)
•
0.595 (–4.5
dB)
•
0.500 (–6.0
dB)