Video signal-ppt

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: DVI –D (Digital Only) DVI- A ( Analog Only) 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.