TVP5146M2PFP_0708 datasheet(21/108 Pages) TI

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Functional Description

SLES141B—August 2007

TVP5146M2PFP

Figure 2−4. Color Low-Pass Filter Frequency

Response

f – Frequency – MHz

−70

−60

−50

−40

−30

−20

−10

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

ITU-R BT.601 –3 dB

@ 1.42 MHz

Figure 2−5. Color Low-Pass Filter With Filter

Characteristics, NTSC/PAL ITU-R BT.601

Sampling

f – Frequency – MHz

−70

−60

−50

−40

−30

−20

−10

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Filter 3

–3 dB @ 554 kHz

Filter 2

–3 dB @ 844 kHz

Filter 1

–3 dB

@ 1.03 MHz

Filter 0

–3 dB @ 1.41 MHz

2.2.2.2

Y/C Separation

Y/C separation can be done using adaptive 5-line (5-H delay) comb filters or a chroma trap filter. The comb

filter can be selectively bypassed in the luma or chroma path. If the comb filter is bypassed in the luma path,

then chroma trap filters are used which are shown in Figure 2−6 and Figure 2−7. TI’s patented adaptive comb

filter algorithm reduces artifacts such as hanging dots at color boundaries. It detects and properly handles

false colors in high frequency luminance images, such as a multiburst pattern or circle pattern. Adaptive comb

filtering is the recommended mode of operation.

f – Frequency – MHz

−40

−35

−30

−25

−20

−15

−10

−5

01234567

No Notch Filter

Notch 3 Filter

Notch 1 Filter

Figure 2−6. Chroma Trap Filter Frequency

Response, NTSC ITU-R BT.601 Sampling

Notch 2 Filter

−40

−35

−30

−25

−20

−15

−10

−5

01234567

Figure 2−7. Chroma Trap Filter Frequency

Response, PAL ITU-R BT.601 Sampling

f – Frequency – MHz

No Notch Filter

Notch 2 Filter

Notch 1 Filter

Notch 3 Filter

TVP5146M2PFP_0708 Datasheet(PDF) 21 Page - Texas Instruments

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