FS450, FS451
PRELIMINARY PRODUCT DESCRIPTION
JUNE, 2000, VERSION 1.2
7
COPYRIGHT
©
© 1999,2000 FOCUS ENHANCEMENTS, INC.
PRELIMINARY INFORM ATION
656_HSYNC
OHO
B^
656_VSYNC
A^
OHO + OHW
OVO
Blank
Blank
Blank
Blank
C^
Blank
Black
Black
Black
D^
Blank
Black
Active Video
Black
OVO + OVW
Blank
Black
Black
Black
Blank
Blank
Blank
Blank
Figure 4: CCIR 601/656 Field Format
OHO = 139 NTSC, 145 PAL
OVO = 20 NTSC, 23 PAL
OHW = 720
OVW = 487 NTSC, 576 PAL
2.5 Color Space Converter and Scaler
The digital RGB from the GCC is horizontally compressed, stored into a line buffer cache. As the data is
pulled from the line buffer cache, it is converted to 656 YUV and compressed vertically.
2.6 Flicker Filter
The FS450 flicker filter provides significantly more control over the display characteristics than a typical 3
line average flicker filter. The FS450's flicker filter consists of both horizontal (Sharpness) and vertical
(Flicker) controls. Thus, it is called a 2D flicker filter. Both the Sharpness and Flicker registers can be
programmed over a wide range to allow the user to tradeoff flicker and sharpness for readability and reduced
eye fatigue.
2.7 Encoder
The FS450 contains a high quality 2x oversampled video encoder. The 656 luma information is up-sampled
from 13.5 MHz sample rate to 27 MHz with a 19 tap filter which offers excellent flatness to 6MHz and 50 dB
image aliasing suppression. Chrominance information is up-sampled from 6.75MHz sample rate to 27 MHz
with four user selectable bandwidths. The encoder has programmable width and frequency luma notch filter.
The encoder subcarrier is programmable in frequency and phase and with the independence of color format,
vsync, and number of lines allows for the support of the many video standards, including all South American
variations. The FS450 video encoder outputs NTSC M, J and PAL B, D, G, H, I, M, N, Combination N
formats with 10 bits of resolution. Both Composite and S-Video outputs are available simultaneously.
2.8 YUV to RGB Converter
As an alternative to encoded PAL or NTSC, the user may select analog RGB outputs. Each channel of
RGB has 10 bits of resolution.
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