IRIG timecode: Difference between revisions

Revision as of 15:03, 29 June 2022

Revision as of 17:36, 8 January 2023

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| 1 Hz || 1 s || 60 || 1 minute || {{frac|60}} Hz

|}

'''IRIG Code B Calculation''':<br>

Bit rate = 100 Hz = 100 × (1 / second) = 100 / second = 100 / 1000 ms = 1 / 10ms<br>

Bit time = 1 / (Bit rate) = 1 / (1 / 10 ms) = 10 ms<br>

There are 100 Bits per frame.<br>

Frame time = (Bits per frame) × (Bit time) = 100 × 10 ms = 1000 ms = 1 second<br>

Frame rate = 1 / (Frame time) = 1 / 1 second = 1 Hz<br>

<br>

The bits are modulated on a carrier. A three-digit suffix specifies the type and frequency of the carrier, and which optional information is included:

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* Year number (00–99; century is not coded)

* User-defined "control functions (CF)" occupying bits not defined by IRIG

* "Straight binary seconds (SBS)", a 17-bit binary counter that counts from 0 to 86399.<ol start=0 type=1>

<ol start=0 type=1>

<li>BCD, CF, SBS</li>

<li>BCD, CF</li>