360 Systems TCR Multi-Track - Manual (Page 53)

TCR Series UserManual Operations 4-3
When monitoring or recording digital data, it is important that the frequency of the incoming samples
exactly match the frequency of the system sample clock. If the frequencies are not exactly the same,
occasional pops and clicks may be heard as samples are either repeated or dropped. This might occur,
for example, when trying to monitor incoming digital data when the sync reference is the internal
crystal, since this clock is typically not synchronous to the external AES source, even though the
sample rates are nominally the same. By changing the sync reference to be the AES source, the
system clock becomes synchronous with the incoming sample rate, eliminating the problem.
If digital audio inputs are to be recorded using a video reference, the incoming sample rate should
also be generated from the same video reference. When the external sample rate differs from the
internal sample clock, you can still record the digital data by routing it through the sample rate
converter.
Frame and Sample Rates
MENU | Machine Setup | Sync and Time Code | Rate/Format
The Rate/Format menu item selects which time code format is to be used.
External Sync Validity Indicators
Upon returning to the Transport Screen after exiting the setup menus, the TCR activates the selected
sync reference and rate/format selections. If the desired sync source is invalid, then the EXT SYNC
indicator in the Time Code Display flashes, and the STOP button blinks. To help spot incorrect sync
rates, the percentage frequency error for the selected external sync source is shown on the Sync Input
line of the Transport Screen. If the signal is missing entirely, then “BAD” is shown.
Setting Up to Record
Recording with the TCR will be similar to many other machines. Every effort has been made to
incorporate established industry traditions, such as the way ARM and RECORD buttons operate.
Some of TCR’s features are new and extremely useful; it is in the reader’s interest to take advantage
of these capabilities. This section discusses each record-related issue. Topics include:
•
Audio input selection
•
Track arming
•
Signal levels using the track monitoring features
•
Headroom selection
•
Crossfade time
•
Process delays
•
RMW selection
Audio Input Selection
MENU | Machine Setup | Audio I/O | Track Input
You can record from either the analog inputs or the digital inputs for any track pair. A track pair may
be routed through a sample rate converter if desired.