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Synergy Q/MD Engineering Manual (v9.1 MD) System Architecture • 2–13
and the other half of the image being drawn in the second. These two passes are called Fields, where
the first pass is called
Field 1 and the second pass is called Field 2 . When both Field 1 and Field 2
have been drawn, resulting in a complete image, you have a single Frame .
Both Field 1 and Field 2 must be drawn to create Frame 1 . If you are using field or frame numbers as
a counter, you should remember that you must double the number if you are converting from Frames
to Fields . For example, a
4
Frame delay is equal to an
8
Field delay.
Progressive
A Progressive scan video format draws each scan line in sequence, starting from the top of the screen
and working to the bottom. Unlike Interlaced, with Progressive scan the entire image is drawn at one
time, in a single pass. This means that there are no fields in a Progressive scan image.
Because there are no fields in a Progressive scan video signal, you cannot use it as a reference signal
for an Interlaced video signal. Because the Interlaced video format requires information about when
each field is being drawn, you must use a Progressive scan video format as reference for a Progressive
scan video signal.
Progressive Segmented Frame
A Progressive Segmented Frame video is similar to a Progressive scan video format in that both draw
each scan line in sequence, starting from the top of the screen and working to the bottom. Unlike
Progressive, Progressive Segmented Frame transmits the video signal as if it were an interlaced
image: first the odd scanlines are transmitted and then the even scanlines. The even scanlines are
delayed for one “field” on the transmitting end and the odd scanlines are delayed one “field” on the
Field 1
Interlaced
Frame 1 (Field 1 + Field 2)
Field 2
Progressive
Frame 1