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7.1B Time Code Number Differences
In certain situations there will be a slight difference between the
AI-2 time code display and the time displayed on the front panel of
the ADAT. This time difference is due to the fact that the ADAT
transport always displays "real" time and therefore only uses four
of the six possible rate/code type displays, 24/24, 25/25, 29.97/DF
and 30/30.
The difference comes when one of the two non-real time, rate/code
type combinations 29.97/30 or 30/DF is selected in the AI-2. The
time code difference will gradually become more noticeable as the
ADAT tape plays, eventually amounting to approximately three
seconds.
When 29.97/DF or 30/30 is selected, the AI-2 and ADAT time code
values will match, when 29.97/30 or 30/DF is selected the time
code values will mis-match.
7.2 ALL SAFE
The AI-2 track select defaults to all safe. This prevents ADAT
tracks from being selected. To make a record track selection, all
safe must be set off in the Tracks menu.
When all safe is set on, the AI-2 optimizes synchronization perfor-
mance by taking control of the ADAT head track delays which will
result in faster lock times.
When the AI-2 is controlling the head delay the AI-2 reduces the
maximum track delay available by up to 960 samples which is
20 ms, at a sample rate of 48.000 KHz.
To record, all safe must be off and the AI-2 does not make use of
the ADAT track delay feature.
7.3 MIDI INTERFACING
7.3A MIDI Time Code
The AI-2 generates the MIDI time code virtual or relative position of
the ADAT at any given time. The MTC is available at the MIDI OUT
connector in the control section of the rear panel. The MIDI OUT
connector is also used to provide MMC responses, BRC responses
and AI-2 responses to an external MIDI control device.
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