Image Server 2000 Owner’s Manual
Page 37
Arming the Audio tracks
The Image Server can record either two or four audio tracks according to a selection made in the
Channel 1 Configuration window. When a selection is made it will be saved for future recordings.
Select
OPTIONS->CONFIGURE
from the Channel 1 Transport Window.
Refer again to Figure 5 - Timing Configuration Screen for a view of the Channel 1 Configuration
Dialog.
•
Check
Audio 1-2
if you wish to record on tracks 1 and 2 only
•
Check
Audio 3-4
if you wish to record on tracks 3 and 4 (only when using AES-EBU or SDI
Embedded audio input.)
•
Check
BOTH Audio 1-2 AND Audio 3-4
if you wish to record on tracks 1, 2, 3 and 4
•
Uncheck all boxes
if you don’t want to record audio.
•
Check
Closed Caption
for all above cases if you want to record closed caption data into a
separate, dedicated track (See
Setting the Recording Format
below).
Bit-for-Bit
®
Recording & Playback
The recording, storage and playback of audio program material such as Dolby®-E, Dolby Digital
(AC-3) or DTS® requires that upon playout the data stream be identical to the original.
Do not use
the audio sample rate converters when working with these encoded audio formats.
The Image Server and a Dolby® encoder must be supplied with the same genlock signal.
Audio Sync Reference
The audio sample rate is derived from the selected video sync reference. Audio is recorded at a
nominal 48K sample rate, so the 0.1% pull-down for 29.97 NTSC is taken into account when
generating the audio sample rate for color NTSC. There is no drop frame in PAL video.
Setting the Recording Format
Refer again to Figure 5 - Timing Configuration Screen.
Select either
Main (
Main Profile @ Main Level (4:2:0), or
4:2:2
(4:2:2 Profile@ Main Level) by
selecting the corresponding radio button. Refer to Appendix B for a discussion of Profiles.
Select either
1:I-Frame Only
,
6:IBBPBB
or
15:IBBPBB
…
Refer to Appendix B for a discussion of the GOP structure.
Select the
Bit Rate
. The range is
4 – 50 Mb/s
unless
Main
profile is selected. In
Main
profile,
the
maximum rate is 15 Mb/s
. Generally, very good quality video can be achieved at rates as low as
8 Mb/s with IBBPBB settings.
The Image Server always records Closed Caption data directly into the video. However, when using
bit rates below 10 Mb/s it is advisable to enable the dedicated Closed Caption track in the Arm
Tracks section described above. This will guarantee that the encoding process will not affect the
Closed Caption data.
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