Masterclock CLDTCD12, Руководство пользователя

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Introduction
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CLDTCD12
The CLDTCD12 is a precision, multi-featured time code driven digital time display. The CLDTCD12
decodes VITC, IRIG-B and SMPTE linear/longitudinal time code formats to function as a clock.
VITC
Vertical Interval Time Code ( VITC ) is a form of SMPTE time code embedded as a pair of black-and-
white bars in a video signal. These lines are typically inserted into the vertical blanking interval of
the video signal. There can be more than one VITC pair in a single frame of video: this can be used
to encode extra data that will not fit in a standard time code frame.
VITC contains the same payload as SMPTE linear time code frame embedded in a new frame
structure with extra synchronization bits and an error-detection checksum. The VITC code is
always repeated on two adjacent video lines, one in each field. This internal redundancy is
exploited by VITC readers, in addition to the standard time code "flywheel" algorithm.
A video frame may contain more than one VITC code if necessary, recorded on different line-pairs.
This is often used in production, where different entities may want to encode different sets of
time-code metadata on the same tape.