參數(shù)資料
型號(hào)： SAF7113
廠商： NXP Semiconductors N.V.
英文描述： 9-bit video input processor
中文描述： 9位視頻輸入處理器
文件頁數(shù)： 13/80頁
文件大?。?/td> 281K
代理商： SAF7113
2000 May 08
13
Philips Semiconductors
Product specification
9-bit video input processor
SAF7113H
1
0
+
CLAMP
CLAMP
NO CLAMP
1
0
1
0
0
1
1
0
MGC647
fast
GAIN
slow
+
GAIN
+
GAIN
GAIN
HCL
HSY
ADC
SBOT
WIPE
CLL
ANALOG INPUT
GAIN ->
<- CLAMP
VBLK
NO BLANKING ACTIVE
1
0
Fig.8 Clamp and gain flow.
WIPE = white peak level (254); SBOT = sync bottom level (1); CLL = clamp level [60 Y (128 C)];
HSY = horizontal sync pulse; HCL = horizontal clamp pulse.
8.3
Chrominance processing
The 9-bit chrominance signal is fed to the multiplication
inputs of a quadrature demodulator, where two subcarrier
signals from the local oscillator DTO1 are applied
(0 and 90
°
phase relationship to the demodulator axis).
The frequency is dependent on the present colour
standard. The output signals of the multipliers are
low-pass filtered (four programmable characteristics) to
achieve the desired bandwidth for the colour difference
signals (PAL, NTSC) or the 0 and 90
°
FM signals
(SECAM).
The colour difference signals are fed to the
Brightness/Contrast/Saturation block (BCS), which
includes the following five functions:
AGC (automatic gain control for chrominance
PAL and NTSC)
Chrominance amplitude matching (different gain factors
for (R
Y) and (B
Y) to achieve ITU-R BT.601 levels
C
R
and C
B
for all standards)
Chrominance saturation control
Luminance contrast and brightness
Limiting YUV to the values 1 (minimum) and 254
(maximum) to fulfil ITU-R BT.601 requirements.
The SECAM-processing contains the following blocks:
Baseband ‘bell’ filters to reconstruct the amplitude and
phase equalized 0 and 90
°
FM signals
Phase demodulator and differentiator
(FM-demodulation)
De-emphasis filter to compensate the pre-emphasized
input signal, including frequency offset compensation
(DB or DR white carrier values are subtracted from the
signal, controlled by the SECAM switch signal).
The burst processing block provides the feedback loop of
the chrominance PLL and contains:
Burst gate accumulator
Colour identification and killer
Comparisonnominal/actualburstamplitude(PAL/NTSC
standards only)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAF7113H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:9-bit video input processor
SAF7113H/V1,518 功能描述:視頻 IC VIDEO INPUT PROCESSR 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
SAF7113H/V1,557 功能描述:視頻 IC 9-BIT VIDEO INPUT 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
SAF7115 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard video decoder with super-adaptive comb filter,
SAF7115ET 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard video decoder with super-adaptive comb filter,
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