chapter 8 •
synchronization
and
MIDI
ADAT HD24 Reference Manual
69
Using the HD24 with tape-based
ADATs
The ADAT Sync jacks on the back of the HD24 are
designed to allow easy hookup with previous
generations of ADAT that used S-VHS tape as their
media: the original “black” ADAT, the ADAT XT,
XT20, LX20, and the M20, as well as other devices
that have the ADAT Sync interface such as the BRC
Master Remote Control and computer interface
cards. In very general terms, the HD24 tries to
emulate the functionality of an ADAT XT, XT20 or
LX20, but there are some obvious differences that
you need to remember:
•
the HD24 has three times as many tracks as a
tape-based ADAT
•
the HD24 has no rewind or fast forward time;
locates happen immediately
•
the HD24 has features such as Cut, Copy, and
Paste that previous ADATs did not have
•
on the HD24, each Song exists alone; it doesn’t
continue playing on to the next song as a tape
would.
Synchronizing with ADAT
In most cases, it is best in a tape/HD system to
make the tape-based ADATs the master by
putting them first in the sync chain. Otherwise,
with the HD24 as master, it will flash back to a
location point and start playing before the tape-
based ADATs have finished rewinding.
When the HD24 is the slave, keep in mind that on
the HD24, each song emulates a short tape. For
any given song, the HD24 can only locate to
timecode for that song. This can be problematic
since a tape-based ADAT can request the HD24
to locate beyond its limits (either too early or too
late in ADAT time). The following should be
noted:
•
The HD24 requires that its song be at least 10
seconds long for it to sync as a slave.
Therefore, you must press
NEW SONG
and
record some blank time before attempting to
synchronize.
•
If a tape-based ADAT stops just past the end
of a song, it's very likely that the tape ADAT
will try and locate the HD24 past the end of
its defined area. The HD24 will report
"Location Out of Range", which is expected.
•
On the HD24, if there is "No Drive Selected"
or there are "No Songs on Disk", then the
HD24 will report “No Tape” to the rest of the
ADAT chain.
•
While a master tape ADAT is unthreaded and
fast winding, the HD24 lights the
FFWD/REW lights and its timecode display
will not change until the master stops its
FFWD/REW operation and issues a locate
command.
•
Scrubbing:
When the HD24 scrubs audio
as a master, Slave units will not follow until
scrubbing is complete. When scrubbing is
complete, attached slaves will be sent a locate
command to position themselves to the
timecode of the HD24.
•
Format command:
On the HD24, Format
and Eject are not supported through the Sync
In or Sync Out ports. A format of an HD24
Master, will not format hard drives on slave
HD24 units, nor will it format the tapes on
tape-based ADAT slaves. Likewise, a format
of a tape on a Master tape ADAT will not
format a slave HD24 hard drive.
Содержание ADAT-HD24 FirePort 1394
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