SAA7128 Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

Fabricante

SAA7128

Digital video encoder

Philips Electronics 

Philips Semiconductors

Digital video encoder

Product specification

SAA7128H; SAA7129H

7.10 Input levels and formats

The SAA7128H; SAA7129H expects digital Y, CB, CR data

with levels (digital codes) in accordance with

“ITU-R BT.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 “ITU-R BT.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 “ITU-R BT.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

2000 Mar 08

13

Share Link: