參數資料
型號： TMC22052AKHC
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 顏色信號轉換
英文描述： Multistandard Digital Video Decoder Three-Line Adaptive Comb Decoder Family, 8 & 10 bit
中文描述： COLOR SIGNAL DECODER, PQFP100
封裝： MQFP-100
文件頁數： 47/84頁
文件大?。?/td> 417K
代理商： TMC22052AKHC
PRODUCT SPECIFICATION
TMC22x5yA
REV. 1.0.0 2/4/03
47
Adaptive Comb Filter
The IPCF[1:0] register bits select the inputs to the adaptive
comb filter, this would normally be xHH for chroma combs,
xHF for luma combs, and xHL if the luminance signal was to
be sampled dropped on the output of the TMC22x5yA. The
Gaussian filters in the sample drop mode already limit the
chrominance bandwidth to 1.3MHz allowing a [2:1:1] data
format on the output, with the luminance signal having been
vertically filtered by a fixed 3 line comb filter.
The SIMP selection bit is an internally generated signal
based upon the comb filter selected. If a 3 line chroma, luma,
or D1 comb filter is selected, due to the internal 1H delay
inherent with this type of comb filter, the 1HL and 1HH
signals are selected for the respective luma and chroma
SIMPLE
data signals. When any other type of comb filter is
selected 0HL and 0HH are selected.
The DLYF selection bit is also internally generated from the
type of comb filter selected and whether or not the input is in
either the YC or Y & CbCr (ie D1 input) data formats. The
VIDEOB
data is always selected when the YCCOMP register
bit is HIGH, ie for YC inputs. The selection of 1HF or 0HF
depends upon the SIMP selection bit only when the
YCCOMP register bit is LOW. Therefore, when YCCOMP is
LOW and 0Hx is selected by SIMP then 0HF is selected for
the
FLAT
signal, and when 1Hx is selected by SIMP then
1HF is selected for the
FLAT
signal. This ensures that the
FLAT
and
SIMPLE
data selected for any comb filter is
delayed by the same amount as the data processed through
the comb filter to produce the
COMB
output.
The final selection is the output required for the combed
luminance and chrominance data. The output selection can
be
SIMPLE
,
COMB
,
FLAT-COMB
, or
FLAT
. Generally
COMB
is selected based upon whether a luma or chroma
comb was selected and the complementary output selects
FLAT-COMB
. In the YC and Y & CbCr data modes the
FLAT
signal selects the secondary data and
SIMPLE
or
COMB
can
be used to select the primary signal. In these modes the
bandsplit filter can be bypassed or used to remove low fre-
quency noise from the chrominance signal if chroma was
selected as the primary signal.
Figure 16. Signal Flow Around the Adaptive Comb Filter.
SIMP
IPCF[1:0]
OHF
OHH
OHL
1HF
1HH
1HL
2HF
2HH
2HL
VideoB
IPCF[1:0]
YMUX[1:0]
Y Data
C Data
65-22x5y-57
CMUX[1:0]
Adaptive
Comb
Filter
IPCF[1:0]
SIMP
A
B
C
D
A
A: Comb
B: Simple
C: Flat - Comb
D: Flat
B
C
D
DLYF
2:1
MUX
2:1
MUX
3:1
MUX
3:1
MUX
–
3:1
MUX
3:1
MUX
4:1
MUX
4:1
MUX
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