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IRIG standard 212-00 defines a different time-code, based on RS-232-style asynchronous serial communication. The timecode consists of ASCII characters, each transmitted as 10 bits: 1 start bit; 7 data bits; 1 odd parity bit; 1 stop bit; The on-time marker is the leading edge of the first start bit.
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:
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.
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AC-100-WWVB Time Receiver; AC-500-MSF Time Receiver; ClockWatch Radio Sync [20] F6CTE's CLOCK [15] WWV: 2.5, 5, 10, 15, and 20 MHz AM Voice with modified IRIG-Hformat time code on 100 Hz sub-carrier (CCIR code) HF radio and antenna (plus software if automatic updating of computer time is desired) TrueTime TL-3 WWV Receiver
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A timecode (alternatively, time code) is a sequence of numeric codes generated at regular intervals by a timing synchronization system. Timecode is used in video production , show control and other applications which require temporal coordination or logging of recording or actions.
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