Atec Tektronix-MTS300 - Manual (Page 3)

MPEG Test System
MTS300
Regroup Them with Stored Streams
These PES or elementary video and audio
streams can be grouped together into logical
groups – “Programs” of video, audio and other
associated data (private data, e.g., teletext).
T h e o r i g i n a l t i m i n g r e l a t i o n s h i p s a r e
p r e s e r v e d . These streams and/or other pre-
recorded PES or ES streams can then be
reassembled together to build up a totally
new transport stream as the user desires.
Regrouping of elementary streams or pro-
grams can be achieved within an existing
transport stream, by allowing the individual
stream identifiers (PIDs) to be remapped
as required.
Map, Check and Rebuild Your
Own Multiplex
These streams can then be rebuilt into a larger
multiplex stream and new system information
tables can be customized and added. Powerful
syntax auto-check warn the user of mis-mapped,
reserved or duplicate PIDs, including the
Program Paradigm, by checking and automati-
cally updating PAT, PMT and derivable fields
(in its “standard” mode) accordingly, to create
a final legal and DVB or ATSC-compliant out-
put stream. MTS300’s multiplexer allows the
user to be able to construct a transport stream
for any rate equal to or greater than the sum
of the individual components to be multiplexed.
Another facility offered is the ability for the
multiplexer to insert correct PCR values on the
PIDs defined by the user. This allows for PCRs
to be on a separate PID or embedded on an
existing PID.
Generate Compliant Timing and Output Bit
Rates As Required
The multiplexer is able to insert the PCRs
at the correct repetition rate and also allows
the user to specify the PCR repetition rate,
if desired.
Create, Add or Modify SI Flexibility
The multiplexer allows all of the standard
MPEG/DVB/ATSC system information tables
(SI) and descriptors to be edited. The user is
permitted to generate illegal conditions that
allow stress of decoder or transmission chain
equipment to verify its robustness. It is also
possible to generate private tables and
descriptors.
Test Feature – Deliberately Create
Illegal Streams
The software can be set to generate an
optional warning when certain illegal condi-
tions have been generated. This is visible
clearly on the user interface. In a similar man-
ner, the multiplexer allows all legal descriptors
to be added to each table. The repetition rate
for each table can be changed, overriding the
default value. A conditional warning is gener-
ated if an illegal repetition rate is defined.
“Expert” and “Standard” Modes
Standard Mode will calculate related fields
and table pointers (e.g., checksums) for the
user without having to worry, but an Expert
Mode is also provided to allow the user to set
these to illegal conditions for test conditions
as described above.
New Advanced Video and
Audio Elementary Stream
Analysis and Display – ES
Analyzer (Option MTS3FIN)
This application brings to MTS300 not only the
ability to actually view the moving picture from
within a PES stream, but also to carry out a
whole range of sophisticated new tests on the
lower layers of an elementary stream within a
transport multiplex. This gives added confi-
dence when analyzing streams because
encoder performance can be verified right
down to slice and block layer together with
motion vectors (see Figures 1 and 2).
Display and analysis of GOP, Picture, Slices
and Macroblock layer
Picture quality analysis including Quantizer
Scale distribution, motion vector graphs, mac-
roblock and picture-size plots
DCT Analysis and display
Teletext analysis (PES and VBI)
Closed Caption Analysis to EIA 608, 708, 746
DVB Subtitle analysis and display over picture
Analysis of MPEG-2 audio to provide plots of
allocation bits, scalefactor grouping and SCFSI
against sub bands
Audio analysis of MPEG-2 audio to provide plots
of allocation bits, scalefactor grouping and
SCFSI against sub bands
Audio analysis of Dolby Digital (AC-3), AAC,
AdiFF and ADTS
Regression test report generator
MPEG Test • www.tektronix.com/video_audio 3