DekTec DTC-382 TmmXpress - Manual (Page 9)

© 2013 - 2014 DekTec Digital Video BV Page 9/12 DTC-382 TmmXpress Manual
Essential Tools for Digital-TV Professionals April 2014
DTC-382 TmmXpress
7.5. Output settings
This area allows you to specify the output settings. Dependant on the selected output format, other
selection fields are shown in this area.
- Format
Format Description
I/Q Float32 Pairs of 32-bit floats in I, Q order
I/Q Int16 Pairs of signed 16-bit integers in I, Q order, little Endian:
Byte #0: Least-significant byte I
Byte #1: Most-significant byte I
Byte #2: Least-significant byte Q
Byte #3: Most-significant byte Q
Etc.
I/Q Text Text (ASCII)-based format consisting of pairs of four-character hexadecimal
values with 0x prefix in I, Q order. The I and Q values are separated by a
TAB and I/Q pairs are separated by a linefeed.
Example:
0x2b450x1c3f
0xfeA90x0073
RF ISDB-Tmm/T
SB
/T RF output through the selected modulator port
7.5.1. I/Q Output Settings
In case the output type I/Q samples is selected (I/Q Float32, I/Q Int16 or I/Q Text), this area allows
the selection of the location and the base name of the generated I/Q sample file.
I/Q samples file settings
- #Frames
The number of OFDM-frames to be generated. The resulting file length and size are displayed.
- Append files
If not checked, TmmXpress overwrites the previously generated file. If checked, the TmmXpress
appends the new generated data to the end of the existing file.
- RMS
The Root Mean Square (RMS) of the complex samples. This value should be set as large as
possible to have the largest SNR, but small enough to avoid saturation. When a DekTec card is
used for play-out of the I/Q samples, the value 5000 is a good value.