Avid Technology Digidesign USD, User Manual, Page: 42 / 96

Universal Slave Driver 38
analog recordings so as to have the record-
ing made at the true nominal sample rate
(for example, exactly 44.1 kHz.)
If Pitch Memory is disabled and the se-
lected external clock reference is not avail-
able, then the USD will revert to the nomi-
nal, selected internal sample rate setting.
To configure Pitch Memory (Hold) from the
front panel:
1
Using the Set, Down, and Up switches,
select Pitch Hold (PICH HLd):
2
Press the Set switch again. The LED Time
Code Display will switch to display one of
the two parameter values:
• On (On); or
• Off (OFF).
3
Use the Down and Up switches to switch
between the parameter values.
Using USD Setup:
■
Click Pitch Memory Enabled.
When you have chosen your desired op-
tion, press Set. The LED Time Code Display
will return to showing time code numbers.
The USD will retain the setting, even when
the unit is powered off and on again, until
changed
Positional References
Positional Reference relates to the USD
time code readers and generator, and to the
Bi-Phase reader.
Whereas the clock connections and Clock
Reference setting serve to keep your sys-
tem's components all operating at exactly
the same rate over time, the Positional Ref-
erence is the facility for working with a par-
ticular time address.
The Positional Reference setting serves to
place the USD into a reading or generating
mode. While in a reading mode, time ad-
dresses may be obtained from LTC, VITC,
or Bi-Phase. While in the generate mode,
the USD simultaneously generates LTC,
VITC, and MTC.
Positional Reference and Bi-
Phase/Tach
Time code and positional reference are not al-
ways directly synonymous. In this guide
the terms are used interchangeably except
while referring specifically to Bi-
Phase/Tach, as noted in the following sec-
tions.
Selecting a Positional
Reference
To select a positional reference from
Pro Tools:
1
Open the Session Setup window.
2
Choose a reference setting from the Posi-
tional Reference pop-up menu.