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SAA4945H/V1

LIne MEmory noise Reduction IC (LIMERIC)

Philips Electronics 

Philips Semiconductors

LIne MEmory noise Reduction IC

(LIMERIC)

Preliminary specification

SAA4945H

Noise estimator

The threshold value N_thr for the filters is calculated in the noise estimator block (see Fig.3). There are four options for

producing the N_thr value:

1. Pre-filter gain setting (YpScale)

2. Wval selects the sensitivity of the noise estimator

3. TASTE (TS) scales the N_thr linear

4. NTHR is externally applied when the noise estimator is disabled by the control bit ExThr of the Status Register.

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YI

PRE-FILTER

YpScale

NOISE ESTIMATOR

Wval

×

MUX

4

NTHR

TS0-TS3 ExThr

N_thr

MGK171

Fig.3 Noise estimator.

SIGNAL DESCRIPTION

Input signals

YI7 TO YI0 (PINS 7 TO 14)

• Eight bit wide digital luminance input bus

• Unsigned data; dynamic range between 0 and 255

• The maximum number of input samples equals

852 active samples/line.

UI1 AND UI0 (PINS 15 AND 16)

• Colour difference signal U

• Data in 2’s complement; dynamic range between

−128 and +127

• Y : U : V format 4 : 1 : 1; see Table 8 for input data

coding

• The maximum number of input samples equals

213 samples/line

• Internal data processing of U signals in unsigned format.

VI1 AND VI0 (PINS 17 AND 18)

• Colour difference signal V

• Data in 2’s complement; dynamic range between

−128 and +127

• Y : U : V format 4 : 1 : 1; see Table 8 for input data

coding

• The maximum number of input samples equals

213 samples/line

• Internal data processing of V signals in unsigned format.

1997 Jun 10

7

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