SDA9588X Ver la hoja de datos (PDF) - Micronas

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Fabricante

SDA9588X

Cost-effective Picture-In-Picture ICs

Micronas 

SDA 9488X

SDA 9588X

Preliminary Data Sheet

System Description

CKILL

D1 D0

0

0

0

1

1

1

1

1

X

X

COLON

0

0

0

0

1

color killed at damping of

30 dB

18 dB

24 dB

color always off

color always on

Table 4-4 Color-killer adjustment

The bandwidth of the chroma filter is adjustable via CHRBW. The bandwidth depends

on whether the decoder is in SECAM operation or not. A change in CHRBW does not

result in a chrominance position shift on the screen.

CKSTAT can be read out and gives information whether the color is switched on or off.

STDET indicates the detected color standard. Additionally PALID signals whether a PAL

signal or a NTSC signal is applied.

4.4

Comb Filtering

Depending on the selected picture size and color standard, a comb filtering is performed

for luminance and chrominance. A comb filter uses the spectral interleaving of the

encoded luminance and chrominance to separate both without cross artifacts. Thus

cross-color and cross-luminance are suppressed effectively. For NTSC sources, a comb

filtering is performed for all picture sizes. Due to reduced bandwidth in horizontal and

vertical direction a strong reduction of cross artifacts can be achieved for PAL signals.

The same applies for the luminance signal of SECAM signals.

4.5

Luminance Processing

The A/D-converted CVBS (or Y) signal is digitally clamped to back porch. Depending on

the transmitted standard and operational area, an offset between black- and blanking

level can be found in the incoming signal (’7.5 IRE’). As for some applications a black

offset is not desired, controlling may be done using LMOFST. The positive or negative

offset is added to the Y signal before scaling.

Micronas

4-15

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