SAA4992H Datasheet, PDF (17/36 Pages) NXP Semiconductors – Field and line rate converter with noise reduction

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NAME
Proscan4
PlfThr
ProDiv
UseVec
KplOff
General
NrBlks
NrBlks
TotalLnsAct98
TotalLnsAct70
TotalPxDiv8
REaShift
SNERT
ADDRESS
HEX
READ/
WRITE⁽¹⁾
7
6
5
4
3
2
1
0
DESCRIPTION⁽²⁾
01F
write; F
X X X Multiplier threshold at which to switch the lower limit of the filter
coefficient for interpolated lines. Above this threshold, the differences
corresponding to the two neighbouring lines are used as clipping
parameters, below this threshold, the interpolated line difference is
used as clipping level. This parameter can be used to optimize the
de-interlacing quality in slowly moving edges; it is not likely to have
effect if PlfLim is high.
XX
Scaling factor to control the strength of the filtering for the interpolated
lines. A value 0 means no scaling (normal filtering), while 3 means
scaling by factor 8 (very strong filtering). This parameter can be used
to adjust the de-interlacing to varying level of noise in the input picture;
use higher scaling for higher noise.
X
Enables use of estimated vectors to shift pixels from previous frame to
the current time (null vector or estimated vectors). It is best
switched to ‘null vector’, if vectors are unreliable.
X
disable all recursion in calculating pixels for frame memory (recursive
or non recursive); to be true SAA4991WP and digital scan emulation
modes
020
write; S
X X X X X X number of blocks in active video (6 to 53, corresponds to
96 to 848 pixels), to be set as ¹â„₁₆ (number of active pixels per
line + 15); take remarks on TotalPxDiv8 into consideration
XX
total number of output lines (bits 9 and 8)
021
write; S X X X X X X X X total number of output lines (bits 7 to 0)
022
write; S X X X X X X X X Total number of pixels per line divided-by-8 (80 to 128, corresponds to
640 to 1024 pixels). The horizontal blanking interval is calculated as
TotalPxDiv8 − 2 × NrBlks and has to be in the range from 12 to 124
(corresponds to 96 to 992 pixels). Conclusion: TotalPxDiv8 has to be
set to 12 + 2 × NrBlks < TotalPxDiv8 < 124 + 2 × NrBlks and NrBlks
has to be set to ^{T----o----t-a----l-P----x---D--2--i--v---8----–}-----1---2----4- < NrBlks < ^{T----o----t-a----l-P----x---D2----i--v---8----–}-----1---2--
023
write; S
X X X shift of REa signal in number of pixels (0, +1, +2, +3, −4, −3, −2 or −1)