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Talon RTX 2767 Operating Manual
Chapter 7: Recorded Data Format
The Talon system records data to disk as a binary file. This file contains a header that is
1024 bytes in size and is immediately followed by the recorded data. The Pentek boards
used in the Talon system present this data as raw twos−complement data.
This header contains important information about the recording that can be used to
process and analyze the data. The recorded data resides in the file as contiguous data as
streamed by the I/O interface. This data is written by default in little−endian format.
Table 7−1
The File Viewer, described in
information about the recording and for scaling the displays.
7.1
IF data
The IF data provided by the DDC is recorded as "Packed I/Q" data, where I and Q are
each 16−bit values.
This data is provided by default in the following format.
Bits D15 to D00 − I data
Bits D31 to D15 − Q data
7.2
Baseband data
The baseband data provided by the ADC is recorded as time−packed data, where each
64−bit word contains four consecutive 16−bit samples.
This data is provided by default in the following format:
• The first sample, at time 't', is placed into bits 15 to 0.
• The next sample, at time 't+1', is placed into bits 31 to 16.
• The next sample, at time 't+2', is placed into bits 47 to 32.
• The next sample, at time 't+3', is placed into bits 63 to 48.
provides details about the file header.
Chapter 10
uses this file header information to display
Page 45
Rev.: 1.0
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