UltraLite SMPTE addendum for Windows

The UltraLite and SMPTE Time Code Synchronization
OVERVIEW
The UltraLite can resolve directly to SMPTE time code via any
analog input, without a separate synchronizer. The UltraLite can
also generate time code via any analog output. The UltraLite
provides a DSP-driven phase-lock engine with sophisticated
filtering that provides fast lockup times and sub-frame accuracy.
Direct time code synchronization is supported by Cubase,
Nuendo and other audio sequencer software that supports the
ASIO2 sample-accurate sync protocol.
Any analog input and output on the UltraLite can be used for time
code (LTC) input and output, respectively.
FireWire SMPTE Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Clock/Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Frame Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Reader section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Generator section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Setting up for SMPTE time code sync. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Resolving Cubase or Nuendo to SMPTE time code . . . . . . . . . . . . . . . . . . . . .3
FIREWIRE SMPTE SETUP
The included MOTU SMPTE Setup™ software provides a
complete set of tools to generate SMPTE for striping, regenerating
or slaving other devices to the computer.
CLOCK/ADDRESS
The Clock/Address menu (Figure 1) provides the same global
Clock Source setting as in MOTU Audio Setup (“Clock Source” on
page 28 in the UltraLite manual), 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 (Word Clock In / Internal)
shows the clock source (Word Clock In) followed by the address
The Reader section provides
settings for resolving to video
and/or SMPTE time code.
(Internal). Notice that only the SMPTE setting supports SMPTE
time code as the reference for address. The S/PDIF digital clock
source does not support the UltraLite’s on-board SMPTE time
code sync. To resolve the UltraLite to SMPTE time code, choose
the 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.
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
UltraLite 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.
READER SECTION
The Reader section (on the left-hand side of the window in
Figure 1) provides settings for synchronizing the UltraLite to
SMPTE time code.
Status lights
The four status lights (Tach, Clock, Address and Freewheel) give
you feedback as follows.
Tach
The Tach light blinks once per second when the UltraLite has
successfully achieved lockup to SMPTE time code and SMPTE
frame locations are being read.
Clock
The Clock light glows continuously when the UltraLite has
successfully achieved lockup to an external time base, such as
SMPTE time code or word clock.
The Generator section
provides settings for striping
SMPTE time code.
Figure 1: SMPTE Setup gives you access to your UltraLite’s on-board SMPTE
time code synchronization features.
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Address
The Address light glows continuously when the UltraLite has
successfully achieved lockup to SMPTE time code.
Freewheel
The Freewheel light illuminates when the UltraLite is
freewheeling address (time code), clock or both. For details about
Freewheeling, see “Freewheel Address” and “Freewheel clock”
below.
SMPTE source
Choose the analog input to which the SMPTE time code source is
connected. This is the input that the UltraLite “listens” to for time
code.
Freewheel Address
Freewheeling occurs when there is a glitch or drop-out in the
incoming time code for some reason. The UltraLite can freewheel
past the drop-out and then resume lockup again as soon as it
receives readable time code. Choose the amount of time you
would like the UltraLite to freewheel before it gives up and stops
altogether.
The ‘Infinite’ freewheel setting
The Infinite freewheel setting in the Freewheel Clock menu causes
the UltraLite to freewheel indefinitely, until it receives readable
time code again. To make it stop, click the Stop Freewheeling
button.
Stop Freewheeling
The Stop Freewheeling button stops the system if it is currently
freewheeling.
GENERATOR SECTION
The Generator section (on the right-hand side of the window in
Figure 1) provides settings for generating SMPTE time code.
Level
Turn the level knob to adjust the volume of the SMPTE time code
being generated by the UltraLite. The level knob disappears when
the Destination is set to None.
Tach light
The Tach light blinks once per second when the UltraLite is
generating SMPTE time code.
The UltraLite cannot freewheel address without clock. Therefore,
the Freewheel Address setting will always be lower than or equal to
the Freewheel Clock setting, and both menus will update as
needed, depending on what you choose.
Destination
In the Destination menu, choose the analog output from which
SMPTE time code will be generated. This is the output that sends
time code.
Keep in mind that freewheeling causes the system to keep going
for as long as the duration you choose from this menu, even when
you stop time code intentionally. Therefore, if you are starting and
stopping time code frequently (such as from the transports of a
video deck), shorter freewheel times are better. On the other
hand, if you are doing a one-pass transfer from tape that has bad
time code, longer freewheel times will help you get past the
problems in the time code.
Stripe
Click this button to start or stop time code. To set the start time,
click directly on the SMPTE time code display in the Generator
section and type in the desired start time. Or drag vertically on
the numbers.
Click here to edit the start time, or drag
vertically on the numbers.
The ‘Infinite’ freewheel setting
The Infinite freewheel setting in the Freewheel Address menu
causes the UltraLite to freewheel indefinitely, until it receives
readable time code again. To make it stop, click the Stop
Freewheeling button.
Freewheel clock
Freewheeling occurs when there is glitch or drop-out in the
incoming SMPTE time code for some reason. The UltraLite can
freewheel past the drop-out and then resume lockup again as
soon as it receives a stable, readable clock signal.
The UltraLite cannot freewheel address without clock. Therefore,
the Freewheel Address setting will always be lower than or equal to
the Freewheel Clock setting, and both menus will update as
needed, depending on what you choose.
ULTRALITE AND SMPTE TIME CODE
Figure 2: Setting the time code start time.
Regenerate
This option, when enabled, causes the generator to generate time
code whenever the UltraLite is receiving SMPTE time code.
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SETTING UP FOR SMPTE TIME CODE SYNC
RESOLVING CUBASE OR NUENDO TO SMPTE TIME CODE
In summary, the UltraLite system can resolve directly to SMPTE
time code. It can also generate time code and word clock, under
its own clock or while slaving to time code. Therefore, the
UltraLite can act both as an audio interface and digital audio
synchronizer. You can use the UltraLite to slave your audio
software to SMPTE as well, as long as your software supports
ASIO2 sample-accurate sync, which is the means by which the
software follows the UltraLite. The accuracy may not be sampleaccurate, but in most cases it will be very close.
To resolve your UltraLite directly to SMPTE time code with no
additional synchronization devices, use the setup shown in
Figure 3. Make sure the Clock Source setting in the MOTU Audio
Setup window is set to SMPTE. Also, make sure that you’ve
connected an LTC input signal to an UltraLite analog input, and
that you’ve specified that input in the SMPTE Setup.
Use this setup if you have:
✓ A SMPTE time code source, such as a multitrack tape deck.
✓ Host software that supports sample-accurate sync.
This setup provides:
✗
No sample-accurate locating.
✓ Continuous sync to SMPTE time code.
✓ Sub-frame timing accuracy.
✓ Transport control from the SMPTE time code source.
SMPTE time code
source
Choose SMPTE as the clock source in the MOTU Audio
Setup. This setting can also be made in the MOTU
SMPTE Setup software (shown below).
audio cable bearing LTC
(Longitudinal Time Code)
Any analog input
In Cubase SX, go to the Sync Setup window and choose the ASIO Audio Device option.
UltraLite interface
When lockup is achieved, the CLOCK light illuminates and the TACH light blinks once per second.
FireWire cable
Windows computer running Cubase or
other sample-accurate ASIO2 software
Figure 3: Connections for synchronizing the UltraLite directly to SMPTE time code.
ULTRALITE AND SMPTE TIME CODE
Launch the MOTU SMPTE Setup and specify the SMPTE Source, which is
the input receiving the SMPTE time code. Also, confirm that the Clock
Source/Address is SMPTE/SMPTE.
© 2006 Mark of the Unicorn, Inc.
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