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SAA7152

Digital Video Comb Filter (DCF)

Philips Electronics 

Philips Semiconductors

Digital Video Comb Filter (DCF)

Product specification

SAA7152

Table 1 I2C-bus; subaddress and data bytes for writing (after X = 0 in address byte)

FUNCTION

SUBADDRESS

Controls

00

D7

BYPS

D6

CSEL

DATA

D5

D4

D3

CCMB YCMB TAPS

D2

D1

CFRQ NLIN

D0

LLEN

Function of the bits of Table 1:

BYPS

CSEL

CCMB

YCMB

TAPS

CFRQ

NLIN

LLEN

Select bypass with a short delay; all other 0 = no bypass

functions are disabled:

1 = comb filter bypassed (delay is 3 LLC)

Input mode select:

0 = CVBS selected

1 = Y/C selected

Select comb filtering

0 = chrominance is bandpassed

1 = chrominance is comb-filtered

Enable chrominance substruction from

CVBS signal:

0 = disabled, CVBS/Y signal is only low-passed

1 = enabled (chrominance trap or comb filtering)

Selects tap for switching Y and C to

adder:

0 = for bandpass/low-pass combination

1 = for comb filter active

Select centre frequency and matching

factor of chrominance filter:

0 = 4.43 MHz

1 = 3.58 MHz

Select delay (number of lines):

0 = 4-line comb filter for standard PAL

1 = 2-line filter for standard NTSC

Selects the number of clocks for each

line delay:

0 = 1728 clocks (625 lines; 50 Hz)

1 = 1716 clocks (525 lines; 60 Hz)

August 1996

8

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