IRIG timecode: Difference between revisions

Revision as of 21:38, 1 September 2004

Revision as of 21:39, 1 September 2004

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'''Inter-Rangerange Instrumentationinstrumentation Groupgroup timecodestime codes''', commonly known as "IRIG" timecodes, were created by the TeleCommunications Working Group of the [[Inter-Range Instrumentation Group]], a US Navy Standards organization. The work on these standards was started in October of 1956, and the original standards where accepted in 1960.

The original formats were described in IRIG Document 104-60, which was later revised and reissued in August 1970 as IRIG Document 104-70, leading to an upgrade later that year of the IRIG Document to the status of a Standard, IRIG Standard 200-70. The latest version of the Standard is IRIG Standard 200-95.

The different timecodes defined in the Standard are given alphabetic designations. A, B, D, E, G, and H are the standards currently defined by 200-95. C was in the original specification, but was replaced by H. The main difference between the codes is their rate, which varies between 1 pulse per minute and ten thousand pulses per second.