User Manual-Mac

MOTU SMPTE CONSOLE
118
CLOCK/ADDRESS
The Clock/Address menu provides the same global
Clock Source setting as in the MOTU PCI Audio
Console (“Clock Source” on page 66), but it
includes additional information: each setting
shows both the clock and the address (time code or
sample location), separated by a forward slash ( / ).
For example, the word clock setting
(2408mk3:Word Clock In / Internal) shows the
clock source (Word Clock In) followed by the
address (Internal). Notice that only the SMPTE
and video settings support SMPTE time code as
the reference for address. The digital clock sources
do not support the PCI-424 system’s on-board
SMPTE time code sync.
Resolving to SMPTE time code
To resolve the PCI-424 system to SMPTE time
code, choose the PCI-424: SMPTE / SMPTE setting
in the Clock/Address menu. This means that the
system will use SMPTE as the clock (time base)
and SMPTE as the address. Be sure to specify the
input that is receiving the SMPTE time code by
choosing it from SMPTE source menu. For further
details on the hardware connections involved, see
“Syncing to SMPTE time code” on page 41.
Resolving to video
To resolve the PCI-424 system directly to video,
you need a 2408mk3 interface. Choose the
PCI-424: Video / SMPTE setting in the Clock/
Address menu. The system will resolve to the video
signal received on the Video In BNC jack on the
2408mk3 interface for clock (time base), and it will
reference SMPTE time code (on the analog input
specified in the SMPTE Source menu) for address.
For further details on the hardware connections
involved, see “Syncing to video” on page 42.
FRAME RATE
This setting should be made to match the SMPTE
time code frame rate of the time code that the
system will be receiving. The PCI-424 system can
auto-detect and switch to the incoming frame rate,
except that it cannot distinguish between 30 fps
and 29.97 fps time code. So if you are working with
either of these rates, make sure you choose the
correct rate from this menu. The PCI-424 driver
updates the frame rate setting in Digital Performer
and AudioDesk for you. For ASIO applications,
however, you need to make sure that their frame
rate it set properly.
READER SECTION
The Reader section (on the left-hand side of the
window in Figure 14-1) provides settings for
synchronizing the PCI-424 system to video and/or
SMPTE time code.
Status lights
The four status lights (Tach, Clock, Address and
Freewheel) give you feedback as follows.
Tac h
The Tach light blinks once per second when the
PCI-424 system has successfully achieved lockup
to SMPTE time code and SMPTE frame locations
are being read.
Clock
The Clock light glows continuously when the
PCI-424 system has successfully achieved lockup
to an external time base, either SMPTE time code
or video.
Address
The Address light glows continuously when the
PCI-424 system has successfully achieved lockup
to SMPTE time code.
Freewheel
The Freewheel light illuminates when the PCI-424
system is freewheeling address (time code), clock
or both. For details about Freewheeling, see
“Freewheel Address” and “Freewheel clock” below.