Barco STELLAR User And Service Manual page 174

C
N
General on EDH
Reference
Background
EDH flags
Picture groups
P and S
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behavior
References
BARCO data
broadcasting ID
C-2
General on EDH
The P and S support EDH (Error Detection and Handling) for 625
OLARIS TELLAR
lines SDI according to SMPTE RP 165.
EDH is used for recognizing errors and inaccuracies in the SDI signal. You may use
EDH as a tool to help pinpointing sources of errors in a chain of SDI equipment,
including video codecs with SDI interfaces.
Conceptually, the P and the S
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SDI input
P O L A R I S M u l t i c h a n n e l M P E G - 2 E n c o d e r
The P analyzes the EDH data from the SDI input, and checks for CRC errors.
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The flags are manipulated, if necessary. The EDH data is then transmitted in the TS.
The S outputs the EDH data it receives. Alternatively, if the codec is the first
TELLAR
"EDH node" in an installation, the user may wish to let the S
data with all flags cleared. This feature is supported by the S
EDH includes the following flags for each field:
• IDH Internal error Detected Here
• IDA Internal error Detected Already
• EDH Error Detected Here
• EDA Error Detected Already
• UES Unknown Error Status
There are three picture groups, that each includes the above flags:
• ANC (ANCillary data)
• AP (Active Picture)
• FF (Full Field)
All flags for all groups are supported by the P
tion of internal errors in the sense of EDH is not supported. Therefore, the codec
never sets the IDH flags, but always clears the IDH flags, and only uses the status of
the incoming IDH flags to influence the status of the outgoing IDA flags.
The P Multichannel Encoder, Operator and service manual, order no. 983743,
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explains the EDH flags in details.
The EDH data between the encoder and decoder is sent as BARCO data broadcasting
sub_id 0x01.
is one EDH entity.
TELLAR
EDH entity
Transport stream
S T E L L A R M P E G - 2 D e c o d e r
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TELLAR
and S
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SDI output
output EDH
.
. However, detec-