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SAA7126

Digital video encoder

Philips Electronics 

Philips Semiconductors

Digital video encoder

Product specification

SAA7126H; SAA7127H

7.8 Input levels and formats

The SAA7126H; SAA7127H expects digital Y, CB and CR

data with levels (digital codes) in accordance with

“CCIR 601”.

For C and CVBS outputs, deviating amplitudes of the

colour difference signals can be compensated by

independent gain control setting, while gain for luminance

is set to predefined values, distinguishable for 7.5 IRE

set-up or without set-up.

The RGB, respectively CR-Y-CB path features a gain

setting individually for luminance (GY) and colour

difference signals (GCD).

Reference levels are measured with a colour bar,

100% white, 100% amplitude and 100% saturation.

Table 1 “CCIR 601” signal component levels

COLOUR

Y

SIGNALS(1)

CB

CR

R(2)

G(2)

B(2)

White

235

128

128

235

235

235

Yellow

210

16

146

235

235

16

Cyan

170

166

16

16

235

235

Green

145

54

34

16

235

16

Magenta

106

202

222

235

16

235

Red

81

90

240

235

16

16

Blue

41

240

110

16

16

235

Black

16

128

128

16

16

16

Notes

1. Transformation:

a) R = Y + 1.3707 × (CR − 128)

b) G = Y − 0.3365 × (CB − 128) − 0.6982 × (CR − 128)

c) B = Y + 1.7324 × (CB − 128).

2. Representation of R, G and B (or CR, Y and CB) at the output is 9 bits at 27 MHz.

Table 2 8-bit multiplexed format (similar to “CCIR 601”)

TIME

Sample

Luminance pixel number

Colour pixel number

BITS

0

1

2

3

CB0 Y0

0

CR0 Y1

1

0

4

5

6

7

CB2 Y2

2

CR2 Y3

3

2

2002 Oct 15

10

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