8. Sample Rate and Multipliers
The sample rate and multipliers (section L9-L13) follow automaticallly
to the word clock input signal. When audio reference is set to to EXT
WORD 1:1 it is not possible to access the sample rate and multiplier
sections in the menu.
Enter the setup mode and select the
sample rate
section (L9).
(See page 10 for more informations how to navigate through the
different setup sections.)
LTC FPS:
The base sample rate of the audio clock generator can be set to 44.1
or 48kHz.
The nanosyncs HD is also able to resolve audio word clock signals to
external, free running LTC time code signals.
The next section (L10) allows you to enter a so called pull factor.
These factors are special sample rates which are used in audio post
production to compensate frame rate differencies from video and film
standards.
Only forward running timecode within a +/- 10% window, is used as a
reference. The nanosyncs HD will perform a very slow calibration to
your time code source, which can take up to a half minute.
+4%
(25/24)
PAL / film
Once calibrated the nanosyncs HD will relock immediately to the
same speed as long as you do not change the sample rate or the
reference time code format.
+0.1% (1001/1000)
30 fps / NTSC
-0.1% (1000/1001)
NTSC / 30
-4%
(24/25)
film / PAL
Once calibrated the nanosyncs HD will flywheel over looping,
ramping and low or high speed time code with no disturbance to the
audio clock outputs.
Note: For standard audio productions all four LEDs must be off.
Enter the setup mode and select the
multipliers
section (L11-L13).
LTC produced by analog tape recorders will be flywheeled to produce
a ultra low jitter synchronised audio clock.
To generate double or quad sample rates (88.2, 96, 76.4, 192 kHz) it
is possible to apply x2 or x4 multipliers.
Select the used LTC time code standard stepping through the FPS
section in the audio reference field.
WO1-6 (word clock outputs 1-6) are configured according (L11) to
output x1, x2 or x4 rates. Outputs WO 7-8 can be set to x1, x2, x4 or
x256 (digidesign super clock) shown in column (L12).
Four LEDs indicate
24 fps, 25 fps, 30 fps, -0.1% pull down
The AES/EBU reference outputs can be set to x1 or x2 factors (L13).
The SPDIF reference output can be set to x1 or x2 factors (L13).
29.97 fps is on display with 30 fps and -0.1% LEDs
23.98 fps is on display with 24 fps and -0.1% LEDs
The blue LOCKED LED indicates the generation of LTC
synchronised audio clocks.
Drop or non-drop formats are irrelevant, because this is just a speed
synchronisation process.
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