STG3000X-RIVA128 STMicroelectronics, STG3000X-RIVA128 Datasheet - Page 38

• Manufacturer Part Number: STG3000X-RIVA128
• Description: 128-BIT 3D MULTIMEDIA ACCELERATOR
• Manufacturer: STMicroelectronics

RIVA 128
Figure 36. Displaying 2 fields with 1:1 ratio
The RIVA 128 video overlay handles interlaced vid-
eo by displaying every field, at the original frame
rate of the video (50Hz for PAL and 60Hz for
NTSC). The video scaling logic upscales , in the ver-
tical direction , t he luma components in each field
and linearly interpolate s successive lines to pro-
duce the missing lines of each field . This interpolat-
ed scale is applied such that the full frame size of
each field is stretched to the desired height.
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Interpolated line
(Line 11 & 13)
Line 11
Line 13
Frame 1 (Top field)
128-BIT 3D MULTIMEDIA ACCELERATOR
The video scaler offsets the bottom field image by
half a source image line to ensure that both frames
when played back align vertically.
The vertical filtering results in a smooth high quality
video playback.
ter another
terlaced video output
els in each field are
original source was captured.
Frame 2 (Bottom field)
, any
Also by d
motion art
displayed in the order
are removed
isplaying both fields one af-
i
facts often found in dein-
Line 10
Interpolated line
(Line 10 & 12)
Line 12
, because the
in which
pix-
the