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Cantar-X User Manual v2.44 (r14) 2013 March 21
p.13
p.13
Calendar and Sync Times
Time is the essence of a digital audio recorder. Cantar uses
two kinds of time: '
Calendar Time
' organizes folders and
files, '
Sync Time
' links audio and picture.
Calendar Time
System date
and
time
run on a medium precision clock
which creates the workday folders. This clock is powered
for four to six years by a 3V Lithium CR1220 button bat-
tery. With the HD compartment open, it is easily reached;
replace it as soon as you witness date freezes.
In STOP, the system date and time is displayed on the rect-
angular screen; check it for a ±five minute consistency with
the time-zone you are working in. Think of it when you get
off of a three-hour flight.
Go to TECHSET.21 'System Time', [ok], a triangle points to
the modifiable digit. Using [jog], select the desired value,
press the [>] or [<] to move on to the next column, [ok] to
exit. Power 'OFF' Cantar then 'ON' for the CPU to use the
new system time.
The
Workday
is related to the date defined by the calendar
clock but not totally a clone of it. The workday is an interpre-
tation of the 'human' day; its duration can be from 6 AM in
the morning to 3 AM in the deep night next day. If you turn
'OFF' the batteries after midnight, Cantar thinks the Operator
has gone to sleep. But if your 'workday' is continued into
the wee hours after a midnight snack, you would probably
not want it to be considered a 'new' workday. That is why
Cantar displays '
New Workday?
', giving you the opportunity
to say 'NO'. Note that going to TEST or REC is a way to
say 'YES'.
Thus, if you stop working at 2 AM one day, the audio files
are technically still part of the previous workday. Conversely
if you want to start a new workday right after midnight, just
turn 'OFF' Cantar, then back 'ON' and answer 'YES' or go
to TEST.
Sync Time
At startup you will notice a blinking
int c
or
ext c
icon,
depending upon the master (internal clock) or slave (external
clock) mode selected in AUDIO/TC.15 'Tc Source'. This
blinking icon reminds you to verify that the same timecode is
running in all of the camera(s) and audio recorder(s).
Four methods are used to sync images and sounds
Method 1
'int c' internal
Free-Run
master-clock
Set AUDIO/TC.15 'Tc Source' to '
Int. Clock
'. The internal
TCXO 1ppm 'Sync Clock' keeps the time accurate to within
±one frame in nine hours; this time is used to stamp the
sound files with the very same TC as the one stamped on
the camera's images (AatonCode method called 'Free-Run
TC' in the video world).
Once initialized Cantar behaves as a
master-clock.
Internal 'Sync Clock' initialization choices:
A Calendar init.
At startup, Cantar reads the system's calendar date and time
to initialize the 'Sync Clock', '
Stc
' (System-TC) is displayed in
the rectangular screen.
To remind you to sync other equipment around
to the Cantar
'Sync Clock', the '
int c
' icon keeps blinking until you press
[shift] [TC jam]. 'Confirm Sys time' is displayed.
B Operator init.
If you want to set the 'Sync Clock' with your own date and
time, go to AUDIO/TC.21 'OperTc Init'. '
Otc
' (Operator-TC)
is displayed in the rectangular screen.
C LTC init. & control
(from camera, GPS, or Cantar)
LTC-out
On TEST, press [TC jam] for more than three seconds; the
entered LTC jams the internal 'Sync Clock', '
Jtc
' (Jammed-TC)
is displayed in the rectangular screen.
On TEST, press [TC jam] shortly; the difference between entered TC and
internal TC is displayed: 'no answer', 'good 0.3', 'fair 0.5', 'bad +1',
'other' (to be implemented in a future version).
[TC jam] has no effect if there is no valid timecode on the TC
input, '
Jam Failed No LTC
' appears in the rectangular screen
and the '
int c
' icon continues to blink.
D ASCII init.
(from Aaton OriginC)
On STOP, the 'Sync Clock' is set by an Aaton OriginC
which also initializes cameras and GMT generators. '
Atc
'
(ASCII-TC) appears in the rectangular screen.
STOP
TIME & SYNC [1]
