Positional Reference And Options - DigiDesign SYNC HD Manual

Regulating Output Sample Rate with
Pitch Memory
Pitch Memory holds the output sample rate
steady even when the Clock Reference is un-
available or has gone out of lock range.
When Pitch Memory is not enabled, the out-
put sample rate would return to the nominal
sample rate setting (for example, exactly
44.1 kHz) when the Clock Reference disappears
or goes out of lock range.
When Pitch Memory is enabled, Pro Tools
continues to play and record at the resolved
sample rate even if the Clock Reference source
disappears.
The SYNC peripheral retains the Pitch Mem-
ory setting, even when the unit is powered off
and on again, until you change it.
To configure Pitch Memory:
From Pro Tools:
Choose Setup > Peripherals and click Synchro-
1
nization.
Select the Pitch Memory Enabled option.
2
Click OK.
3
From the front panel:
Press Set, and use the Up and Down switches
1
to display Pitch Hold ("PICH HLd").
Press Set.
2
Press the Up or Down switches to toggle be-
3
tween On and Off.
Press Set.
4
From the SYNC Setup software utility
(Windows only):
Click Pitch Memory Enabled.
Positional Reference
and Options
The following sections provide additional infor-
mation for each available Positional Reference
format.
Linear Time Code (LTC)
LTC is often striped onto an ATR or VTR audio
track. Professional VTRs typically have an ad-
dress or cue track, intended for LTC. If you are
working with a standard audio tape, you'll al-
most certainly be working with LTC. If you're
working with a videotape, you may be able to
work with either LTC or VITC, or both.
LTC can also be generated as an interpolation of
Absolute code. This is how time code DAT ma-
chines, DA-88s, and many digital VTRs work.
LTC is delivered to the SYNC peripheral as a se-
ries of audio pulses, regardless of how it is stored
or generated.
LTC can be used simultaneously as a positional
reference and a clock reference.
To use LTC as the SYNC peripheral positional
reference:
From Pro Tools:
In the SYNC Setup section of the Session Setup
window, choose LTC from the Positional Refer-
ence pop-up menu.
From the front panel:
Press the Positional Reference switch to select
LTC.
Chapter 4: Using SYNC Peripherals 43