CXD2064Q 查看數據表（PDF） - Sony Semiconductor

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CXD2064Q

Digital Comb Filter (NTSC/PAL)

Sony Semiconductor 

CXD2064Q

• Vertical enhancement circuit

This circuit generates an enhanced component in accordance with the vertical aperture component

(luminance difference from the preceding and following lines) of the luminance signal. The vertical aperture of

the picture can be enhanced naturally by adding this enhanced component to the luminance signal after Y/C

separation.

The enhancement level can be set in eight steps. The size of | a | in the figure below varies according to the

pin settings. Accordingly,enhanced level can be changed for portions of natural pictures with small luminance

differences where the effects are particularly easy to see.

Portions with large luminance differences are cut with a limiter so that they are not excessively enhanced.

Also, portions with extremely large luminance differences such as white and black lines are not enhanced

because they need be enhanced any more.

Limiter

Enhancement level

0

–a a

Limiter

Luminance difference

Enhancement

level

Pin settings

VEH3 VEH2 VEH1

(Pin 20) (Pin 21) (Pin 22)

OFF

L

L

L

1

L

L

H

2

L

H

L

3

L

H

H

4

H

L

L

5

H

L

H

6

H

H

L

Max

H

H

H

|a|

—

Large

↑

↓

Small

–8–

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