Chapter 6: Using Pro Tools | Sync X 27
LTC (Linear Time Code)
In addition to positional reference, LTC can be used as a clock reference. However, LTC cannot be read when the reference deck
is stopped, or is playing back slow or at fast wind speeds (roughly 10x playback speed). Sync X will not lock until the LTC signal
is within +/– 8% of nominal play speed.
To resolve Sync X to incoming LTC:
1 Connect the output of your LTC source to the LTC IN XLR port on Sync X.
2 In the Pro Tools Session Setup window, select LTC as the Clock Reference Source.
Bi-Phase/Tach
Sync X can resolve to Bi-Phase/Tach information for use as a Clock Reference.
To resolve Sync X to Bi-Phase/Tach:
1 Connect the Bi-Phase/Tach source to the GPIO, BI-PHASE/TACH IN, PILOT IN DB-25 port on Sync X.
2 In the Pro Tools Session Setup window, select Bi-Phase as the Clock Reference Source.
Pilot Tone
Sync X can resolve to an external Pilot Tone signal for synchronizing to (or transferring audio from) certain types of open-reel au-
dio tape recorders. Pilot Tone is a 60 Hz (NTSC) or 50 Hz (PAL) sine wave tone. Pilot Tone is used on location film shoots to es-
tablish a common sync reference between a film or video camera with a portable 1/4-inch analog ATR. Pilot Tone contains no po-
sitional information; it provides only clock reference.
Sync X uses 60 Hz or 50 Hz as the pilot tone reference frequency according to the
Video Ref Format setting. When set to PAL,
the pilot tone frequency used is 50 Hz. When set to
NTSC, 60 Hz is used.
The minimum recommended amplitude for Pilot Tone is 0 dBu (0.775V).
To resolve Sync X to Pilot Tone:
1 Connect the Pilot Tone reference source to the GPIO, BI-PHASE/TACH IN, PILOT IN DB-25 port on Sync X.
2 In the Pro Tools Session Setup window, select Pilot Tone as the Clock Reference Source.
AES3, AES3id, 10 MHz, or Word Clock
To resolve Sync X to external AES3, AES3id, 10 MHz, or Word Clock:
1 Connect the AES3, AES3id, 10 MHz, or Word Clock output of an external digital device to the corresponding AES3 IN,
AES3id/10 MHz IN, or WC IN port on Sync X.
2 In the Pro Tools Session Setup window, select the appropriate Clock Reference Source: AES3, AES3id, 10 MHz, or Word
Clock
.
For more information on LTC, see LTC Signals.
For more information on Bi-Phase/Tach signals, see Bi-Phase/Tach.
For more information on Pilot Tone signals, see Pilot Tone.
AES3 uses a balanced XLR connector whereas AES3id uses an unbalanced BNC connector.
The AES3 and AES3id input ports on Sync X only recognize and use the clock portion of an incoming AES3 or AES3id audio
signal. All audio information is ignored and is not be passed to the Sync X AES3 or AES3id output ports.
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