INVESTIGATING UNKNOWN IRIG CHAPTER 4, CLASS I OR II FORMATS

Abstract

This describes one approach to investigating an unknown IRIG 106, Chapter, 4 Class I or Class II Pulse Code Modulation (PCM) format. The assumption is that you are supplied with decrypted data and clock signals for the unknown PCM stream. This technique is optimized for 16, 12, or 8-bit Word Minor Frames. Standard IRIG 106, Appendix C, Table C-1, Frame Synchronization (Frame Sync) values of 32, 24, 16-bit patterns are simpler to investigate. Other IRIG Frame Sync patterns can also be investigated, but are not dealt with in this document. This document will utilize a sample 24-bit Frame Sync pattern, because it will produce Endian issues in the recorded data.