VDP3133Y datasheet(18/76 Pages) MICRONAS

18 / 76 page

VDP 313xY

ADVANCE INFORMATION

Micronas

2.10.7.Chrominance Transient Improvement

The intention of this block is to enhance the chromi-

nance resolution. A correction signal is calculated by

differentiation of the color difference signals. The differ-

entiation can be selected according to the signal band-

width, e.g. for PAL/NTSC/SECAM or digital component

signals, respectively. The amplitude of the correction

signal is adjustable. Small noise amplitudes in the cor-

rection signal are suppressed by an adjustable coring

circuit. To eliminate ‘wrong colors’, which are caused

by over and undershoots at the chrominance transi-

tion, the sharpened chrominance signals are limited to

a proper value automatically.

Fig. 2–15: Digital Color Transient Improvement

2.10.8.Inverse Matrix

A 6-multiplier matrix transcodes the CR and CB signals

to R-Y, B-Y, and G-Y. The multipliers are also used to

adjust color saturation in the range of 0 to 2. The coef-

ficients are signed and have a resolution of 9 bits. The

matrix computes:

−Y = MR1

×C

B+MR2×CR

−Y = MG1

×C

B+MG2×CR

−Y = MB1

×C

B+MB2×CR

The initialization values for the matrix are computed

from the standard ITUR (CCIR) matrix:

For a contrast setting of CTM+32, the matrix values

are scaled by a factor of 64 (see Table 2–5 on

page 32).

2.10.9.RGB Processing

After adding the post-processed luminance, the digital

RGB signals are limited to 10 bits. Three multipliers

are used to digitally adjust the whitedrive. An average

beam current limiter using the same multipliers is

implemented (see Section 2.11.1. on page 21).

2.10.10.Picture Frame Generator

When the picture does not fill the total screen (height

or width too small) it is surrounded with black areas.

These areas (and more) can be colored with the pic-

ture frame generator. This is done by switching over

the RGB signal from the matrix to the signal from the

internal picture frame generator.

The width of each area (left, right, upper, lower) can be

adjusted separately. The generator starts on the right,

respectively lower side of the screen and stops on the

left, respectively upper side of the screen. This means,

it runs during horizontal, respectively vertical flyback.

The color of the complete border can be programmed

in the format 3

× 4 bit RGB. The contrast can be

adjusted separately.

a) CRCB input of DTI

b) CRCB input + Correction signal

c) sharpened and limited CRCB

CR in

CB in

Ampl.

CR out

CB out

−0.345

1.773

1.402

−0.713

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