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IRIG B122 transmits one hundred pulses per second on an amplitude modulated 1 kHz sine wave carrier, encoding information in BCD. This means that 100 bits of information are transmitted every second. The time frame for the IRIG B standard is 1 second, meaning that one data frame of time information is transmitted every second.
The Inter-Range Instrumentation Group (IRIG) is the standards body of the Range Commanders Council (RCC). The group publishes standards through the RCC Secretariat at White Sands Missile Range . The best known IRIG standard is the IRIG timecode used to timestamp video, film, telemetry, radar, and other data collected at test ranges.
IRIG-B timecode consists of 100 bits, repeated each second. Every tenth bit is a "position identifier", and most of the remainder encode the current time (date, hour, minute and second). Bits 60–68 and 70–78 are reserved for other uses; IEEE 1344 is such a use. It defines the bits as follows:
IRIG may mean: The Inter-Range Instrumentation Group , a standards publishing body Inter-range instrumentation group time codes , the best known IRIG standards
The first half looks almost like IRIG-B, except the time runs backwards until launch, and forwards afterwards. The second half is almost a duplicate of the first, and is zero until the time of launch, after which it holds the launch time. If there is any interest, I would be happy to do a write up on it.]
A slight flaw in the 1992 published papers decoder coefficients, and the use of heuristic search algorithms in order to solve the set of non-linear simultaneous equations needed to generate the decoders was published by Wiggins et al. in 2003, [4] and later extended to higher order irregular decoders in 2004 [5]
libdca (formerly libdts) is a free library for decoding DTS Coherent Acoustics streams. It is released under the terms of the GNU General Public License, and is developed by Gildas Bazin of the VideoLAN team.
degrib (AKA NDFD GRIB2 Decoder) is a reader for GRIB 1 and GRIB 2 files. wgrib2 is a reader for GRIB 2 files. GRIB API Archived 2017-10-04 at the Wayback Machine is an API developed at ECMWF to decode and encode GRIB edition 1 and 2 data. Note: this package has now been replaced by ecCodes which is a superset of GRIB API.