© 2003 Wohler Technologies Inc. ALL rights reserved
19
ATSC/DVB-3/SDI User Manual P/N 821557 Rev-A
General Technical Observations
The Serial Digital Interface (
SDI
) to
AES/EBU
Converter PCB (
919096
) allows selected Wohler Technologies audio monitoring
systems to be connected directly to an
SDI
video signal containing embedded audio. Two levels of component signals (eg., D1, D5,
and Digi Betacam type) are currently supported; synchronous audio at 48 KHz with either 20-bit data packets or audio and extended
data packets.
In the
ATSC/DVB-3/SDI
model, the
919096
demultiplexes (extracts) the audio data from the video data, reformatting it to the
AES/
EBU
standard which is then processed by the
ATSC Digital Decoder
PCB (
919129
) converting the
AES/EBU
signal to
Analog
audio.
A front panel 4-position
rotary
switch selects between
SDI Group 1
,
2
,
3
, or
4
. A front panel 2-position
toggle
switch selects channels
one
and
two
(
first
subgroup) or channels
three
and
four
(
second
subgroup) from whichever
SDI Group
is selected for demuxing.
SDI to AES/EBU PCB (919096) Description
919096 Specifications
Input characteristics:
Receiver type:
Sensitivity performance:
SDI input level:
Input formats:
Audio sampling rate:
SDI output type:
SDI output:
SDI output level:
AES from SDI output level:
AES data bits:
Error Indication:
75 Ohm (BNC), AC coupled, 15 dB minimum return loss, 10-270 MHz
Auto equalizing with clock regeneration
Tolerates cable loss of at least 30 dB @ 135 MHz
400 - 1000 mV
Component, either 525 or 625 lines w/ 48 KHz audio
48 KHz
Fully regenerated copy of SDI input signal (equalized and regenerated,
scrambled NRZI)
15 dB minimum return loss, risetime 0.75-1.5 ns (20-80%)
800 mV +/-10%
75
Ω
(BNC) unbalanced, risetime 5-30 ns (10-90%)
20
Bi-color LED (red/green)
Off = no signal
Green = signal present
Red = Error
Section 3: Technical Information
