Digital Video Signal According to ITU-BT.R.601 (CCIR 601) - Digital Video and Audio Broadcasting Technology - page 81

4 Digital Video Signal According to ITUBT.R.601
(CCIR 601)

Uncompressed digital video signals have been used for some time in tele-
vision studios. Based on the original CCIR Standard CCIR 601, designated
as IBU-BT.R601 today, this data signal is obtained as follows:
To start with, the video camera supplies the analog Red, Green and Blue
(R, G, B) signals. These signals are matrixed in the camera to form lumi-
nance (Y) and chrominance (color difference C B and C R ) signals.

Luminance
sampling frequency
13.5 MHz

5.75 MHz

8/10 Bit

Y

A A D
A A D
A A D

Y

R
G
B

8/10 Bit

Cb

270 Mbit/s
ITUBT.R 601
„CCIR601“

Cb

8/10 Bit

Cr

Cr

2.75 MHz

6.75 MHz
chrominance
sampling frequency

Fig. 4.1. Digitization of luminance and chrominance

These signals are produced by simple addition or subtraction of R =
Red, G = Green, B = Blue:

Y = (0.30 • R) + (0.59 • G) + (0.11 • B);