VDP313XY datasheet(12/76 Pages) MICRONAS

12 / 76 page

VDP 313xY

ADVANCE INFORMATION

Micronas

Fig. 2–6: PAL color decoding options

Fig. 2–7: SECAM color decoding

2.4.9. Luminance Notch Filter

If a composite video signal is applied, the color infor-

mation is suppressed by a programmable notch filter.

The position of the filter center frequency depends on

the subcarrier frequency for PAL/NTSC. For SECAM,

the notch is directly controlled by the chrominance car-

rier

frequency.

This

considerably

reduces

the

cross-luminance. The frequency responses for all

three systems are shown in Fig. 2–8.

Fig. 2–8: Frequency responses of the luminance

notch filter for PAL, NTSC, SECAM

2.4.10.Skew Filtering

The system clock is free-running and not locked to the

TV line frequency. Therefore, the ADC sampling pat-

tern is not orthogonal. The decoded YCRCB signals

are converted to an orthogonal sampling raster by the

skew filters, which are part of the scaler block.

The skew filters allow the application of a group delay

to the input signals without introducing waveform or

frequency response distortion.

The amount of phase shift of this filter is controlled by

the horizontal PLL1. The accuracy of the filters is 1/32

clocks for luminance and 1/4 clocks for chrominance.

Thus the 4:2:2 YCRCB data is in an orthogonal pixel

format even in the case of nonstandard input signals

such as VCR.

Chroma

CVBS

Luma

CRCB

a) conventional

b) S-VHS

CRCB

Notch

filter

Chroma

Process.

Delay

Chroma

Process.

MUX

CVBS

CRCB

Notch

filter

Chroma

Process.

Delay

MHz

–10

–20

–30

–40

MHz

–10

–20

–30

–40

PAL/NTSC notch filter

SECAM notch filter

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