參數(shù)資料
型號: 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: 多標準視頻解碼器與自適應(yīng)梳狀濾波器和分量視頻輸入
文件頁數(shù): 39/169頁
文件大?。?/td> 665K
代理商: SAA7118
2001 May 30
39
Philips Semiconductors
Preliminary specification
Multistandard video decoder with adaptive
comb filter and component video input
SAA7118
8.2.2
D
OWNFORMATTER
The block mainly consists of 2 parts: the colour difference
signal downsampler and the Y-path.
The colour difference signals are first passed through
low-pass filters which reduce alias effects due to the lower
data rate. The ITU sampling scheme requires that both
colour difference samples fit to the first Y sample of the
current time slot. Thus the C
R
signal is delayed by 1 clock
before it is fed to the multiplexer. The switch signal defines
the data multiplex phase at the output: a ‘0’ marks the first
clock of a time slot, this is a C
B
sample. The output is fed
through a register, so that the multiplexer runs with the
opposite phase.
The delay compensation for the Y signal already provides
most of the registers required for a small high-pass filter. It
can be used to compensate high frequency losses in the
analog part. It provides 2 dB gain at 6.75 MHz.
The Y high-pass filter frequency response is shown in
Fig.26. The DC gain of the filter is 1, so a limiter is required
at the filter output. The current implementation clips at the
maximum values of 0 and 511. The entire filter can be
controlled by the I
2
C-bus bit CMFI in subaddress 29H.
handbook, full pagewidth
MHB732
LOW-PASS
LOW-PASS
bypass
HIGH-PASS
CR
CB
CMFI
switch
Y
Q
D
0
1
Q
D
(CR-CB)OUT
Q
D
YOUT
delay compensation
n
Fig.24 Downformatter block diagram.
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: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