360 Systems TCR Multi-Track - Manual (Page 64)

4-14 Operations TCR Series UserManual
Chasing External Time Code
The CHASE button will synchronize the TCR to either an LTC or VITC external time code source.
Time Code Input Selection
MENU | Machine Setup | Sync and Time Code | TC Input
The TC INPUT selection specifies the source of the external time code to be used for time code
triggering, either LTC, VITC, or VITC IF NO LTC.
Time Code and Sync Reference Relationships
MENU | Machine Setup | Sync and Time Code | Sync Ref
MENU | Machine Setup | Sync and Time Code | TC Input
The Sync Reference Menu selects the clock source used to generate the TCR’s audio sample rate.
Hence, the TCR plays synchronously to this reference signal. The Time Code Input (TC Input)
Menu selects the time code source used to start playing the TCR at a specific location.
Each of these selections is made independently, but certain combinations may produce undesirable
results. For example:
Sync Reference = INTERNAL; TC Input = LTC
When the TCR is using its internal crystal as the clock source it cannot be synchronized to the
time code input. However, if an external LTC source is present, the TCR will attempt to
phase lock its frame edges with those of the incoming LTC when the TCR is stopped. In this
way, when it starts to chase, it will start playing with its frame edges aligned with those of the
external LTC. Since the frame boundaries in the TCR are derived from its internal crystal
and are asynchronous to external LTC, they will start to drift apart as playback continues. To
chase LTC and remain locked to it, set the SYNC REF to LTC.
Sync Reference = VIDEO; TC Input = LTC or VITC
The time code source must be synchronized externally to the video reference signal.
Sync Reference = Non-VIDEO; TC Input = VITC
If the Sync Reference is not VIDEO when chasing VITC, there may be a phase error between
the TCR frames and the VITC frames of up to one-half frame. When using VITC as the time
code source, the Sync Reference should be set to VIDEO, and a synchronized video reference
signal should be applied to the VIDEO REF IN connector. Alternately, the VITC signal can
be split with a “T” adaptor and applied to both VITC IN and VIDEO REF IN connectors.
Sync Reference = WORD CLOCK; TC Input = LTC
The LTC signal must be locked to the incoming sample clock (word clock) externally.
Sync Reference = AES 1-2 or AES 3-4; TC Input = LTC
The external time code source must be synchronized to the external AES sample clock. If
not, the frame boundaries associated with the TCR playback will start in phase, but will drift
from the incoming LTC signal as playback progresses.