參數(shù)資料
型號(hào)： SAA4977H
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： Besic
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝： PLASTIC, SOT-318-2, QFP-80
文件頁(yè)數(shù)： 25/32頁(yè)
文件大?。?/td> 186K
代理商： SAA4977H
1998 Jul 23
25
Philips Semiconductors
Preliminary specification
Besic
SAA4977H
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.
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.
Fig.11 Luminance levels.
handbook, full pagewidth
1.00 V
black 16
white 255
INPUT 8 bit
OUTPUT 10 bit
output_range = 1
output_range = 0
0
0
64
1023
1023
0
256
288
767
1.34 V
MGM598
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SAA4981 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Monolithic integrated 16 : 9 compressor
SAA4981T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Monolithic integrated 16 : 9 compressor
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