MACKIE SDR96 - Manual (Page 19)

19
Operation Guide
Oper
a
tion
Guide
Synchronization
The Sync Options menu (under SETUP) allows you to select the sample clock
source, sample rate, time code source if time code chase is enabled, frame rate,
and sample size. Sample clock source, time code source, LTC output, and MTC
output are global settings, and are project independent. Sample rate, frame rate,
and sample size are saved in the project file.
Sample Clock
The Sample Clock setting
(SETUP:Sync:SClk) determines the
source of the SDR24/96 sample clock. If
the SDR24/96 is a clock master or is not
connected to any other digital device(s),
set it to Internal. If the SDR24/96 is a
word clock slave, set it to Word Clock.
If the SDR24/96 is a slave to a device
connected to one of the digital optical inputs, set it to either ADAT A, ADAT B, or
ADAT C
, depending on which digital port the master device is connected to.
Sample Rate
The Sample Rate (SETUP:Sync:SRate)
determines how fast the SDR24/96
sample clock runs. Compact Discs use
a 44.1 kHz sample rate, while some
DVD disks use 96 kHz. The video production folks prefer 48 kHz because their
digital video recorders use 48 kHz. When 44.1 kHz or 48 kHz is selected, all 24
tracks are available at both the analog and digital inputs and outputs. When 88.2
kHz
or 96 kHz is selected, only 12 tracks are available at the digital inputs and
outputs. The selected sample rate appears in the status display. If 88.2 kHz or 96
kHz
is selected, the X2 LED lights. Use the same sample rate throughout a
project.
Time Code Chase
The T-CODE CHASE button allows the SDR24/96 to sync to an external time
code source. In Play mode, the PLAY LED blinks until the SDR begins
receiving valid time code. When valid time code is detected, the PLAY LED
lights steadily, the transport jumps to the time code position being received,
and playback begins at that point.
Note:
Looping is disabled when T-CODE CHASE is enabled.
Time Code Source
The SDR24/96 can chase time code
from either MIDI IN or SMPTE IN. Use
Time Code Source (SETUP:Sync:TcSrc) to select either MTC-Jam Contin,
MTC-Chase, LTC-Jam Contin,
or LTC-Chase.
You must still select
the SDR24/96’s
Sample Rate even if
it’s slaved to another
device’s clock. If you
don’t set it correctly,
the SDR24/96 time
display will run at
the wrong rate, even
though audio will
play at the right
speed.
SETUP MENU >
Record I/O Sync Transp
SYNC OPTIONS >
SClk SRate TcSrc FrRate
SAMPLE CLOCK: Internal
<< >> OK
SAMPLE RATE: 44.1 kHz
<< >> OK
TC SRC: MTC-Chase
<< >> OK
T-CODE
CHASE
MTC (MIDI Time Code) is read at the MIDI IN connector, and LTC
(Longitudinal Time Code) is read at the SMPTE IN connector.
With Chase selected, the transport locks to the incoming time code and the
sample rate is adjusted to stay synchronized to the time code. The SDR24/96
must use its internal clock in Chase mode. A good application for using Chase
mode is when slaving to an analog tape. If there is wow and flutter from the
tape, Chase mode is self-correcting.
With Jam Contin (Jam Continuous) selected, once the transport locks to the
incoming time code, the transport is governed by the the word clock speed. It is
assumed that all devices are synchronized to the same master clock. If not, the
time code can drift between devices. Use Jam Continuous mode when the
devices are synchronized to the same master clock.