NTi Audio Digirator DR2 - Manual (Page 13)

13
Overview
Characteristics of the SYNC input
The sampling frequency of the Digirator can be synchronized
and locked to external devices. In order to do this, the sync
signal is connected to the universal sync input circuitry via a
female XLR connector to the DR2. An adaptor for connecting
a BNC cable to the XLR input is also included as a standard ac-
cessory item with the DR2.
Supported sync / clock formats
The Digirator recognizes clock sources automatically as they
are connected. There is no need for a manual selection of the
sync format. The following formats are supported:
• AES3 / DARS 20 kHz to 216 kHz (continuous)
• Word Clock
32 kHz (+/- 100 ppm)
44.1, 48 kHz (x1, x2 , x4) (+/- 100 ppm)
• Black Burst PAL (25 Hz) and NTSC (29.97 Hz)
fs = 48 kHz
1
3
2
AES / EBU
XLR - 110 Ω
AES3-id
S/PDIF
RCA - 75 Ω
1
3
2
110 75
75
Word Clock,
Blackburst
Video
AES3,
DARS SYNC IN
XLR - 110 Ω,
75 Ω, High-Z
Clock
Processing
Digital Audio
Transmitter
fs
WAVE
DEFAULT FOLDER2 ...
• Signal1.wav
• Signal2.wav
• ...
• Signal1.wav
• Signal2.wav
• ...
Input impedance
AES3 as well as Word Clock signals are separated by an electri-
cally isolated transformer terminated with the nominal imped-
ances of 110 ohm or 75 ohm. But Hi-Z mode is also supported,
allowing trial operation of the DR2 in parallel with other de-
vices.
Jitter suppression
The extracted sampling frequency is fed into a clock recovery
stage with high jitter attenuation. This ensures stable and opti-
mized signals at the DR2 output. With input sampling frequen-
cies that deviate more than 100 ppm from the AES standard
sampling frequencies, no clock recovery will be executed. Un-
der special circumstances this might lead to suboptimal stabil-
ity of the output signal .
DARS (Digital Audio Reference Signal)
... is an AES3 Signal, intended for syn-
chronizing equipment. Its channel status
data are marked accordingly by setting the
DARS Bits.