LA76818 Просмотр технического описания (PDF) - Unspecified

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LA76818

The BUS Control Functions of LA76818 (Tentative)

Unspecified 

Technical Note of LA76818

2002/01/23

00 = Narrow

11 = Wide

White Peak Limiter

2 Select White Peak Limiter level.(with Defeat)

When there is a bright spot signal in a low APL picture, ABL/ ACL does not operate

and this will cause blooming problem. To avoid this, when APL is low, white peak

limiter will operate to cut the abnormal bright signal.

00 = WPL OFF

01 = WPL ON(High operating point)

11 = WPL ON(Low operating point)

Y Gamma start point

Select

2 Select Y Gamma start point.(with Defeat)

00 = Y Gamma OFF

01 = Y Gamma ON(High operating point)

11 = Y Gamma ON(Low operating point)

DC Restoration Select

2 Select luma DC restoration

When the Black Stretch function is used during Y signal processing, the pedestal level

will shift according to the APL of signal. Therefore, to avoid this problem, DC renewal

rate can be selected in this IC.

00 = 100%

01 = 107%

10 = 113%

11 = 129%

Black Stretch Start Point 2 Select Black Stretch Start Point(w/Defeat).

Select(w/Defeat)

Select Black Stretch Start Point(with Defeat).

00 = Black Stretch OFF

01 = Black Stretch ON(40IRE)

10 = Black Stretch ON(60IRE)

Black Stretch Gain

Select

00 = MIN.

10 = MAX

2 Select black stretch gain

Auto-Flesh

1 Enable auto- flesh function

Switch ON / OFF the automatic flesh function.

0 = OFF

1 = ON

The characteristic of Automatic Flesh（exclusive use for NTSC）

At the center point of tint、the axis of Flesh is 118 degree、and the maximum

compensation is about 10 degree (7〜20deg).

(Set this function off in PAL system.)

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