NAC Image Technology ST-839, Руководство пользователя

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External input/output signal circuit
9-58
(00400)
■ IRIG-B
Standards IRIG Standard 200-98, IEEE1344
Compatible with
１ kHz carrier modulated IRIG-B (B120, B122, B123
format). Not compatible with carrier signals used, BCD codes, some CF
(IEEE1344
の TMOF) un-modulated IRIG-B (B000, B003 format).
Modulated IRIG-B waveform and exposure timing
Ｐ（ reference ） bit ０ bit １ bit
Modulated on Ｐ bit, ０ bit, and 1 bit. Standard timing is the top portion. 100 bits per second, 10 carrier
per bit. P bit for every 0.1 second. 1 carrier is 1ms.
P P x x x x 0 x x x P x x x x 0
・・
・
P P
0.1sec
1sec
IRIG-B
Exposure timing
100pps
・・
・
Standard timing
The example in the figure above shows the IRIG-B and exposure timing for 100 frames/second. In the
figure,
ｘ indicates 1 or 0 bits.
The IRIG-B and exposure start are consistent with the standard timing at any record speed. (exposure
phase shift set to
０ °)