Kolpak DA-98 manual Rechasing timecode, 10.7.10Bypassing timecode errors

Section 10 – Operations related to timecode

the slave is now 10 minutes and 4 frames behind the master.

Slave (offset set to	Master
+00:10:00:00)
Tape counter	Tape counter
shows:	shows:
10:05:12:08	10:15:12:12
but should be	Absolute difference =
10:05:12:12
	+00:10:00:04

Relative difference =

+00:00:00:04

Since the slave is meant to be exactly 10 minutes behind the master, the difference, +4 frames, is the

“relativeExtdifference”TCbetweenAbthesmasterDiffand the

slaveTapeTCRelGen.

To view00:00:00:the absolute and04relative differences25F between master and slave machines:

1) Go to group menu E:

2)Move the cursor to either AbsDiff (absolute difference) or RelDiff(relative difference). The appropriate value will be shown on the bottom line of the display screen.

10.7.9 Rechasing timecode

When timecode is received, the DA-98 can either constantly monitor the internal off-tape timecode (or the ABS equivalent as set in 10.2, “Tape time- code mode”) and the external timecode, issuing “speed-up” and “slow-down” messages to the transport to keep itself in sync (rechasing), or it can synchronize once and run freely, ignoring the incoming timecode.

While the DA-98 is re-syncing (speeding up and slowing down), playback output will be muted, unless the clock is set to INT). Usually you should find that the DA-98 does not need to rechase, however, and you can leave it in free-running mode. If the timecode master tape includes a

break in the timecode, though, you may want the DA-98 to rechase the master.

As well as selecting rechase, you can also select the length of the “rechase window”. This means that if the difference between internal and incom- ing timecode is greater than the value of this win- dow (1 or 2 seconds in the case of the DA-98), the syn ronizer will start to rechase.

1)	Go to m nu group 4, move the cursor to
		(rechase mode) and press
	ENTER:
	RechsrechaMhodeModaseMseode1secWindow
2)	ModeUse the LEFT RIGHT keys to sel ct the

choose betweenrechaserechase and free.

field, and t UP and DOWN k ys to

3) If you select, use the RIGHT key to

move to the Windowfield, and select a window of either 1or 2seconds.

10.7.10Bypassing timecode errors

As timecode is received from a remote master unit, it may be subject to errors (dropouts on the timecode master tape, etc.). These errors can

unit).

ErrBypasscause nchronization failure (the DA-98 will no longer be locked to the timecode of the master

You can setotheBDAyp-98astosbypass and ignore incoming timecode errors of up to 30 frames in length, or up to 10 frames in length.

1) Go to menu group104, moveFrathemecursor to (Error Byp ss), and press

ENTER:

2)10Use the UP and DOWN keys to select between

and 30Frame.

06/97 – 1.00 – 10-13