Basics of Video

 

    Types of Color Video Signals


 

    Analog Video


The following figures are from A.M. Tekalp, "Digital video processing", Prentice Hall PTR, 1995, NTSC.

NTSC Video

PAL Video

 

    Digital Video


Chroma Subsampling

 

CCIR Standards for Digital Video

(CCIR -- Consultative Committee for International Radio)
                       CCIR 601       CCIR 601         CIF         QCIF
                        525/60         625/50   
                         NTSC         PAL/SECAM       
--------------------  -----------    -----------   -----------  -----------

Luminance resolution   720 x 485      720 x 576     352 x 288    176 x 144

Chrominance resolut.   360 x 485      360 x 576     176 x 144     88 x 72

Color Subsampling        4:2:2          4:2:2         4:2:0        4:2:0

Fields/sec                60             50            30           30

Interlacing               Yes            Yes           No           No 

 

ATSC Digital Television Standard

(ATSC -- Advanced Television Systems Committee) The ATSC Digital Television Standard was recommended to be adopted as the Advanced TV broadcasting standard by the FCC Advisory Committee on Advanced Television Service on November 28, 1995. It covers the standard for HDTV (High Definition TV).

Video Format

The video scanning formats supported by the ATSC Digital Television Standard are shown in the following table.
 

Vertical Lines
Horizontal Pixels
Aspect Ratio
Picture Rate
1080 
1920 
16:9 
60I 30P 24P 
720 
1280 
16:9 
60P 30P 24P 
480 
704 
16:9 & 4:3 
60I 60P 30P 24P 
480
640 
4:3
60I 60P 30P 24P 
Homepage of the Advanced Television Systems Committee (ATSC)



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