AK8817_07 Datasheet, PDF (15/43 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHI KASEI
(7) Luminance Signal Filter ( Luma Filter )
Luminance signal is output via LPF ( see x2 Luma Filter in the block diagram ).
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0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0
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f requenc y [MHz ]
[AK8817/18]
(8) Chroma Signal Filter ( Chroma Filter )
Chroma input signal components ( Cb, Cr ) prior to the modulation go through a 1.3 MHz Band Limiting Filter
( see 4:2:2 to 4:4:4 x2 interpolator in the block diagram ).
Chroma signal which is modulated by the sub-carrier is output via a low pass filter ( Chroma LPF in the block diagram ).
Frequency response of each filter is shown below.
4:2:2 to 4:4:4 Interpolator Filter
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0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
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Frequency[MHz]
x 2 Interpolator Filter
10
0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0
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f requenc y [MHz ]
Rev.000
15
2007 / 03