VSP9435B datasheet(25/126 Pages) MICRONAS

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DATA SHEET

VSP 94x2A

Micronas

Aug. 16, 2004; 6251-552-1DS

2.5.2. Digital Color Transition Improvement (DCTI)

A digital algorithm is implemented to improve horizon-

tal transitions of the chrominance signals resulting in a

better picture sharpness. A correction signal propor-

tional to the slope of the detected horizontal transition

of the input signal is added to the original input signal.

The amplitude of the correction signal is adjustable by

the I2C bus parameter ASCENTCTI.

The I²C bus parameter THRESHC modifies the sensi-

tivity of the DCTI circuit. High values of THRESHC

result in an improvement of significant color transitions

only.

Table 2–11: Conversion table between HCOF/BCOF

and GAINHP/GAINBP

BCOF

GAINBP

HCOF

GAINHP

−10

−1

−0.75

−0.50

−0.25

0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.50

3.00

4.00

Table 2–12: Peaking filter adaption for 36 MHz or 27 MHz operation

Expansion Factor of

Postscaler

Corresponding Frequency of Input

Signal for Center Frequency

Bandpass (B=0.25)

CLKB36=36 MHz/27 MHZ

Corresponding Frequency of Input

Signal for Center Frequency Highpass

(B=0.5)

CLKB36=36 MHz/27 MHZ

0.75

3.375 MHz / 2.5 MHz

6.75 MHz / 5.06 MHz

...

4.5 MHz / 3.375 MHz

9 MHz / 6.75 MHz

...

13.5 MHz / 10.125 MHz

27 MHz / 20.25 MHz

VSP9435B Datasheet(PDF) 25 Page - Micronas

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