Table 1. Picture scanning characteristics
of the 1920x1080/60i format are listed above.
Table 1 shows that the 1920x1080/60i format has a nominal frame rate
of 30Hz or 30/1.001Hz (NTSC-friendly). Each frame consists of two
interlaced fields with an interlace ratio of 2:1, resulting in a field
rate of 60Hz, or 60/1.001Hz for NTSC-friendly applications.
There are a total of 1125 lines per frame. In an analog system this
would imply 562.5 lines in each field. However, because a digital
interface has to be supported, only whole numbers of lines in each
field are allowed. This permits the unambiguous identification of the
lines by the digital timing reference sequences (TRS). As a
consequence, the interlace versions define integer, and hence unequal,
numbers of lines in each of the two fields comprising a frame. Field 1
has 563 lines and Field 2 has 562 lines. The horizontal scanning
frequency is 33750Hz. It is interesting to note that this format uses
analog sync signals that differ from those used by SDTV formats. The
analog sync signals are not digitized, so they are rarely, if ever,
encountered in practice. The reader is referred to the relevant SMPTE
or ITU standard for details.
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