saa4977h NXP Semiconductors, saa4977h Datasheet - Page 26

• Manufacturer Part Number: saa4977h
• Description: Video Processing
• Manufacturer: NXP Semiconductors

Philips Semiconductors
11 APPLICATION
The SAA4977H supports two different up-converter
concepts. The simple one is shown in Fig.12. In this
application only one field memory SAA4955TJ is needed
for a 100 Hz conversion based on a field repetition
algorithm (AABB mode). The concept can be upgraded by
a noise reduction based on a motion adaptive field
recursive filter if the SAA4956TJ is used instead of the
SAA4955TJ.
The SAA4977H supports a dual-clock system. The
acquisition clock is taken from the digital front-end. The
display control is based on a clock generated by an
external H-PLL. By this structure the stability of the display
is enhanced compared to a one-clock system if an
unstable source like a VCR is used as an input.
2000 May 25
handbook, full pagewidth
Besic
1.00 V
white 255
black 16
0
INPUT 8 bit
Fig.11 Luminance levels.
1.34 V
1023
64
0
output_range = 1
26
The second system supported by the SAA4977H is shown
in Fig.13. This concept needs two field memories
(SAA4955TJ) and the signal processing IC MELZONIC
(SAA4991WP). The SAA4991WP allows a vector based
motion estimation and compensation for a display of
100 Hz pictures in high-end TV sets which is free of motion
artefacts.
It additionally provides a variable vertical zoom function,
noise and cross colour reduction. Furthermore a multi-PIP
feature is supported making use of the field memories.
OUTPUT 10 bit
1023
767
288
256
0
output_range = 0
Preliminary specification
MGM598
SAA4977H