Cisco D9040 User And Service Manual page 37

Encoder Model D9040,
Pre-Processing
The pre-processing includes:
• PreSightPlus pre-analysis with look-ahead for improved statistical multiplexing
and normal fixed rate encoding. The PreSightPlus pre-analysis option includes
adaptive quantization m atrices which have a positive impact on both PQR values
and the subjective visual impression. The pre-analysis includes a feature to
dynamically change MPEG-2 quantization matrices and the possibility to enable
3:2 pulldown inversion for 525 lines material.
• PreSight noise reduction (low-pass spatial filter.)
The PreSight video noise reduction removes noise and details that stress the
encoder at low bit rates. It is possible to adjust the filter manually during operation
without service interruption.
The PreSightPlus video noise reduction and pre-analysis features are options that
may be ordered with the D9040 Encoder or added later.
Sub-sampling
The D9040 Encoder supports subsambling. Sub-sampling decreases the resolution
of the source material in order to lower the amount of data to be encoded.
Transport Stream
The encoded data, carrying the video and audio signals, is internally multiplexed
into the MPEG-2 and DVB compliant transport stream by the D9140 Advanced
Multiplexer. The three ASI outputs always carry the transport stream (TS).
4020024 Rev C
Continued
Introduction 2-5