DekTec DTC-378 T2Xpress - Manual (Page 23)

© 2009-2015 DekTec Digital Video BV Page 23/27 DTC-378 T2Xpress Manual
Essential Tools for Digital-TV Professionals February 2015
DTC-378 T2Xpress
- #EIT packets
If the Mode is set to ‘Common PLP Stream’, this parameter specifies the number of successive
packets in the common PLP carrying EIT packets for a given PLP.
- PLP ID
If the Mode is set to ‘Common PLP with Data Stream’, this parameter specifies from which data
PLP the PRBS will be included in the common PLP.
- Path
Path of the selected Transport Stream file
- File bitrate
If possible the bitrate is estimated automatically; otherwise the bitrate has to be specified.
7.11. PAPR Reduction Parameters
If PAPR is used in combination with I/Q or RF output, the PAPR-parameter tab allows you to specify
the parameters for the two peak-to-average power ratio reduction techniques:
- Active Constellation Extension technique (ACE),
- Tone Reservation technique (TR).
Note that not all PAPR-reduction parameter settings can be performed real-time.
7.11.1. PAPR ACE
The PARP-ACE group enables you to specify the parameters for the Active Constellation Extension
technique. If the Enable box is checked, the clipping threshold, gain, limit and interpolation factor
can be specified.
PAPR ACE settings
7.11.2. PAPR TR
The PARP-TR group enables you to specify the parameters for the Tone Reservation technique. If the
Enable box is checked, the clipping threshold and the maximum number of iterations, and the
algorithm can be specified. The P2Only checkbox allows you to specify to apply PAPR TR only on the
P2 symbol regardless if PAPR is signalled in the L1 information.
PAPR TR settings
7.11.3. L1 PAPR
The L1 PAPR group allows you to enable features for P2 PAPR reduction. These features are
available when DVB-T2 version V1.2.1 or V1.3.1 is selected. Available features:
- L1 specific ACE PAPR reduction including a parameter for specifying the maximum constellation
extension value.
- L1 post scrambling, only is available when V1.3.1 is selected.