VDP313XY Ver la hoja de datos (PDF) - Micronas

Número de pieza

componentes Descripción

Fabricante

VDP313XY

Video Processor Family

Micronas 

VDP 313xY

ADVANCE INFORMATION

CVBS

8

Notch

filter

Luma

8

Chroma

8

Chroma

Process.

1H

Delay

a) conventional

Chroma

Process.

1H

Delay

b) S-VHS

Fig. 2–6: PAL color decoding options

Y

CRCB

Y

CRCB

CVBS

8

Notch

filter

Chroma

Process.

1H

Delay

MUX

Fig. 2–7: SECAM color decoding

Y

CRCB

12

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.

dB

10

0

–10

–20

–30

–40

MHz

0

2

4

6

8

10

PAL/NTSC notch filter

dB

10

0

–10

–20

–30

–40

MHz

0

2

4

6

8

10

SECAM notch filter

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.

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