參數(shù)資料
型號(hào)： SAA7118
廠商： NXP Semiconductors N.V.
英文描述： Multistandard video decoder with adaptive comb filter and component video input
中文描述： 多標(biāo)準(zhǔn)視頻解碼器與自適應(yīng)梳狀濾波器和分量視頻輸入
文件頁(yè)數(shù)： 56/169頁(yè)
文件大小： 665K
代理商： SAA7118
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2001 May 30
56
Philips Semiconductors
Preliminary specification
Multistandard video decoder with adaptive
comb filter and component video input
SAA7118
8.4.2.2
Horizontal fine scaling (variable phase delay
filter; subaddresses A8H to AFH and
D8H to DFH)
Thehorizontalfinescaling(VPD)shouldoperateatscaling
ratios between
1
2
and 2 (0.8 and 1.6), but can also be
used for direct scaling in the range from
1
7.999
to
(theoretical) zoom 3.5 (restriction due to the internal data
path architecture), without prescaler.
In combination with the prescaler a compromise between
sharpness impression and alias can be found, which is a
signal source and application dependent.
For the luminance channel a filter structure with 10 taps is
implemented, and for the chrominance a filter with 4 taps.
Luminance and chrominance scale increments
(XSCY[12:0] A9H[4:0]A8H[7:0] and XSCC[12:0]
ADH[4:0]ACH[7:0]) are defined independently, but must
be set in a 2 : 1 relationship in the actual data path
implementation. The phase offsets XPHY[7:0] AAH[7:0]
and XPHC[7:0] AEH[7:0] can be used to shift the sample
phases slightly. XPHY[7:0] and XPHC[7:0] covers the
phase offset range 7.999T to
1
32
T. The phase offsets
should also be programmed in a 2 : 1 ratio.
The underlying phase controlling DTO has a 13-bit
resolution.
According to the equations
and
the VPD covers the scale range from 0.125 to zoom 3.5.
VPD acts equivalent to a polyphase filter with 64 possible
phases. In combination with the prescaler, it is possible to
get very accurate samples from a highly anti-aliased
integer downscaled input picture.
8.4.3
V
ERTICAL SCALING
The vertical scaler of the SAA7118 consists of a line FIFO
buffer for line repetition and the vertical scaler block, which
implements the vertical scaling on the input data stream in
2 different operational modes from theoretical zoom by 64
down to icon size
1
64
. The vertical scaler is located
between the BCS and horizontal fine scaler, so that the
BCScanbeusedtocompensatetheDC gainamplification
of the ACM mode (see Section 8.4.3.2) as the internal
RAMs are only 8-bit wide.
8.4.3.1
Line FIFO buffer (subaddresses 91H, B4H and
C1H, E4H)
The line FIFO buffer is a dual ported RAM structure for
768 pixels, with asynchronous write and read access. The
line buffer can be used for various functions, but not all
functions may be available simultaneously.
Thelinebuffercanbufferacompleteunscaledactivevideo
line or more than one shorter lines (only for non-mirror
mode), for selective repetition for vertical zoom-up.
For zooming up 240 lines to 288 lines e.g., every fourth
line is requested (read) twice from the vertical scaling
circuitry for calculation.
For conversion of a 4 : 2 : 0 or 4 : 1 : 0 input sampling
scheme (MPEG, video phone, Indeo YUV-9) to ITU like
sampling scheme 4 : 2 : 2, the chrominance line buffer is
read twice or four times, before being refilled again by the
source. It has to be preserved by means of the input
acquisition window definition, so that the processing starts
with a line containing luminance and chrominance
information for 4 : 2 : 0 and 4 : 1 : 0 input. The bits
FSC[2:1] 91H[2:1] define the distance between the Y/C
lines. In the event of 4 : 2 : 2 and 4 : 1 : 1 FSC2 and FSC1
have to be set to ‘00’.
The line buffer can also be used for mirroring, i.e. for
flipping the image left to right, for the vanity picture in video
phoneapplications(bit YMIR[B4H[4]]).Inmirrormodeonly
one active prescaled line can be held in the FIFO at a time.
The line buffer can be utilized as an excessive pipeline
buffer for discontinuous and variable rate transfer
conditions at the expansion port or image port.
XSCY[12:0]
1024
XPSC[5:0]
×
Npix_out
×
=
XSCC[12:0]
XSCY[12:0]
--------------2
=
相關(guān)PDF資料
PDF描述
SAA7118E Multistandard video decoder with adaptive comb filter and component video input
SAA7118H Multistandard video decoder with adaptive comb filter and component video input
SAA7120 Digital Video Encoder (ConDENC)
SAA7120H-01 Digital Video Encoder (ConDENC)
SAA7121 Digital Video Encoder (ConDENC)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7118E 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Multistandard video decoder with adaptive comb filter and component video input
SAA7118E/V1,518 功能描述:視頻 IC COMPONENT VID DECODER W/COMB F RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7118E/V1,551 功能描述:視頻 IC COMPONENT VID DECODER W/COMB F RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7118E/V1,557 功能描述:視頻 IC COMPONENT VID DECODER W/COMB F RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7118E/V1/M5 功能描述:視頻 IC COMPONENT + VIDEO PROCESSOR RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
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