DBE 4120
MPEG-2 Encoder System for Contribution
Configuration
guide
Issued by Network Products Marketing Department
GDBD4120 - 09/1999
THOMSON broadcast systems - All rights reserved
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Benefits
4:2:2 and 4:2:0 high performance compression
Thanks to its second generation Thomson chipset, designed in order to improve the
performance encoding, the DBE 4120 encoder features advanced processing
capabilities such as adaptive video pre-processing and new compression features
such as five-level hierarchical motion estimation, far-ranging motion vector calculations
and two-pass rate control, resulting in valuable savings of bit rate for the same video
quality. Furthermore, when picture content must be preserved, the encoding can be
simply changed by software controlled switching from the 4:2:0 format into the 4:2:2
format.
Maximum interfacing flexibility
Besides the basic encoder configuration, four extension slots and software options are
available such that a specific combination of cards and software additional functions
can be used to tailor a customised configuration: composite video input, addition of
analogue or AES/EBU audio channels, ATM interface for PDH or SDH networks, data
and VBI multiplexing for broadcast customising, scrambling for content protection, etc.
Helper Channel capability (option)
The Helper Channel software option allows minimizing the loss in picture quality when
several encoding-decoding processes occur in cascade. The Helper Channel
information is carried by using one VBI line. Automatic detection of re-encoding data
set is achieved
.
Extensive audio handling (option)
Up to eight additional audio signals can be compressed. These are embedded within
the incoming SDI signal or external AES/EBU coded audio. Overall encoder capability
may be achieved with 10 digital stereo audio channels.
Low and ultra-low delay mode capability (option)
Delays in live interviews between different locations can be optimized with the low
delay mode option, providing less than 290 ms end-to-end delay, and now down to 140
ms with the ultra-low delay mode.
VBI lines transport
The DBE 4120 encoder provides the capability of transporting VBI lines from either 50
or 60 Hz, SDI or analogue sources system.
Scrambling capability
DVB compliant common scrambling is provided as an option, in order to preserve the
content and the access, as may be required for instance for post-production.
