FOR MULTIMEDIA STUDENTS

1. VIDEO SIGNAL
Deepa, Assistant Prof.

2. Video Signal
A video signal is that signal which is produced by the video
adapter that allows video to display on display device
Eg: Computer monitor , TV, & Smartphone etc..
Types of video signal
 Component Video
 Composite Video
 S- Video

3. Component Video
Two or more component channel (Present Video)
Popular it is referred as CAV(component Analog Video)
Video information transmitted and stored in 3 separate
signal.

4. Composite Video
 Channel or signal channel in an analog video
 Standard Resolution (480i / 576 i) i=interlaced (SDTV=
standard-definition TV)
 Video information is encoded
 Standard format

5. PAL –Phase Alternating Line
NTSC : National Television System Committe
SECAM: Sequantial Color and Memory
Composite Video Signal Designed by CVBS
(Color Video Blanking Sync.)

6. S- Video ( Separate Video Signal)
◦2 channel in an analog commonly called S-Video (Y/C)
◦Standard resolution- 480 I / 576 I
◦Video information encoded on 2 channel( Luma:
Luminance (y); Chroma color ”c”)

7. Analog Video
◦The analog process encodes video and audio in complete frames
(modulation), with the receiving device interpreting and
translating the signal into video and audio on a monitor (de-
modulation).

8. Single channel
Combined
Luminance
Chrominance Syn. Information

9. Conti..signal
time
F

10. ◦This process can introduce a progressive loss of data
leading to a general loss of video quality. NTSC can only
deliver 720 pixels wide video or stills from video.
◦The above Process an introduce a progressive loss of data.
◦Due to Loss of data the Video Quality Loss Occurs

11. This leads to video error becoz of luminance and
chrominance signal overlapping
Result
error
Dot Crawl
Rainbow
Maxi Res: 720 x 576 (50HZ)
720 x 480 (59.94 HZ)

12. Analog video is a video signal transferred by an analog signal.
When combined in to one channel, it is called composite
video as is the case, among others with NTSC, PAL and
SECAM. ... Analog video is used in both consumer and
professional television production applications

13. Benefits/ Adventage
◦First video signal introduced 1956
Limitation/ Dis adv.
Law resolution
Not globally adaptable
Demodulation losses

14. Use/ Application
◦ Old TV
◦ DVD Player
◦ Video Game Console
◦ VHS

15. Digital Video
Digital video is audio/visual in a binary format. Information is
presented as a sequence of digital data, rather than in a
continuous signal as analog information is.
Digital video data are in digital format (means remain same) such
as 0’s and 1’s

16. Which describes the colors and brightness of each video frames
When the digital data is received by the receiver. There is no
need of data interpretation and translation. Just the delivery of
pure data occur. There fore no loss of data as well as picture
quality remain same.

17. Digital video Signal
Digital video is an electronic representation of moving visual
images (video) in the form of encoded digital data.
Digital video refers to digital video signals comprised of three
separate channels, each carrying a different color component. The
components may be either RGB, or luminance and chrominance (color
difference) components.

18. Digital video is closely related to Component Analog
Video (CAV) which also includes three separate video
channels, each carrying a different component.

19. How digital video Travels in different interface:
DVI (Digital Video Interface)
 Developed to create standard for digital video transfer content.
 Support Multiple Modes:
1. DVI –D (Digital Only)
2. DVI- A ( Analog Only)
3. DVI- I ( both Digital & Analog)
 Max.Resolution: 2560 x 1600 @60HZ
3840 x 2400 @ 33 HZ
BENEFITS : Provide digital format standard

20. TV Standards
There are three categories of video signals often used to group the picture resolution, frame rate, and
bandwidth:
•SDTV (Standard Definition TV)
•EDTV (Enhanced Definition TV)
•HDTV (High Definition TV)
The characteristics that distinguish the above categories are listed in the following tables for the most
common standards (or systems). Progressive systems 480p and 576p are often grouped in with STDV
standards. Here, they are referred to more appropriately as EDTV to indicate that they lie somewhere
between the SDTV and HDTV resolutions and rates. HDTV does not imply a specific resolution or scanning
format. However, HTDV would commonly suggest a format from 1280x720p and above.