SAA7154E/V2/G,518 NXP Semiconductors, SAA7154E/V2/G,518 Datasheet - Page 22

• Manufacturer Part Number: SAA7154E/V2/G,518
• Manufacturer: NXP Semiconductors

Specifications of SAA7154E/V2/G,518

• Adc/dac Resolution: 10b
• Screening Level: Commercial
• Package Type: LBGA
• Pin Count: 156
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
SAA7154E_SAA7154H_2
Product data sheet
7.6.1.1 Color improvement
7.6.1 Picture improvement
7.5 Decoder output control and fader
7.6 Picture improvement and scaler
The OSD processing (see
OSD signal provided by an external device (e.g. teletext decoder SAA5697). Three ADCs
(OSD1, OSD2 and OSD3) convert the three analog RGB inputs AI22, AI32 and AI42 into
3-bit digital streams.
The corresponding FSW signal is also converted from the analog input AI44 to a 3-bit
digital signal by the separate ADC OSD4. The block FSW OSD processes the 3-bit FSW
signal to a 9-bit alpha value, that indicates the ratio to mix the OSD signal with the main
video.
When any valid input signal is missing, a blue screen signal can be inserted under
software control in order to get a valid output signal. The function blue screen can be
enabled by setting bit BSCR (extended register address 72h). I
criteria like horizontal or vertical lock.
All the picture improvement functions are available for all types of input signals including a
digital Y-C
The gravity functions take place in the C
specified color (e.g. skin tone for skin tone correction or green for green
enhancement) are enhanced to be closer to the desired color value (see
gravity function is implemented three times and can be used for skin tone correction,
green enhancement or red apple in any order. Only the blue stretch function is fixed
since here a different algorithm is necessary.
A center of gravity in C
impact. Further, the gravity weighting can be forced in four different steps. The strength of
gravity is a function of the difference between the center of gravity and the actual C
pixel.
Fig 9. Simplified block diagram of gravity functions
Control
Video
B
-C
R
applied to the X-port as an input.
GRAVITY 1
Skin tone
Rev. 02 — 6 December 2007
B
-C
R
Figure
space is defined. The range defines the zone of gravity
Green enhancement
8) mixes the main video signal with an analog RGB
GRAVITY 2
B
SAA7154E; SAA7154H
Multistandard video decoder with comb filter
-C
R
color domain. Colors in the vicinity of a
Blue stretch
GRAVITY 4
(blue)
2
GRAVITY 3
Red apple
C-bus status bits provide
001aaa243
© NXP B.V. 2007. All rights reserved.
Figure
Video
9). This
22 of 90
B
-C
R