PRESENT BY:- DHVANI BHANKHAR RUCHA PATEL

INTRODUCTION  HD IS DESCRIBED FROM THE LATE 1930s.  HIGH DEFINITION TELEVISION.  DIGITAL TV BROAD CASTING FORMAT.  PROVIDES MUCH BETTER RESOLUTION THAN CURRENT TV.  HD TV HAS 1 OR 2 MILLION PIXELS.  HD HAS SUPERIOR RESOLUTION AND DIGITAL SURROUND SOUND.

 In the US, the national television system committee(for which the NTSC standard is named) standardized on 525 lines at 30fps 1940, with regular broadcasts starting on July 1,1941.  NTSC standard was update to introduce first a non-compatible 441 line color standard in 1950 which was replaced by a compatible 525 lines, 29.97fps color standard approved in 1953 and used to this day.  Current high definition video standards were developed during the course of the advanced television process invented by the federal communications in 1987, at the request of American broad-casters.  FCC process, led by the advanced television system communication(ATSC) adopted a range of standards form a interlaced 1080 line video with a particular frame rate of 30fps, and 720 line video, progressively scanned, with a maximum frame rate of 60fps. The FCC officially adopted the ATSC transmission standard( which include both HD and SD video standards) in 1996, with a first broadcast on October 28,1998.

improve the quality of picture and sound. improve the quality of picture and sound. multicasting. multicasting. support HDTV broad casts. support HDTV broad casts. With digital compression methods such as MPEG-2, the bandwidth for a single analog TV channel is enough to carry up to five regular digital TV channels, or up to two HDTV channels using progressive scanning.

 Analog TV-  AM vestigial side band  6MHz bandwidth per channel plus the audio.  High power transmitters for coverage: kW avg.  Noise and multipath interference common.  Digital TV-  8VSB MPEG- 2 stream  8MHz channel can produce multiples program viewable with ATSC tuner(multicasting).  5-7.5kW avg. transmitter output power  Received picture is either perfect or not at all.  5.1 sound and UHF channel spectrum.

 Standard Definition TV (SDTV) :- RESOLUTION OF 480i. SDTV is the basic quality display. Transmission in either the traditional (4:3) or wide screen (16:9)  Enhanced Definition TV (EDTV) :- EDTV comes in 480p wide screen (16:9) or traditional (4:3) format. Provides better picture quality than SDTV. But not as high as HDTV.  High Definition TV (HDTV) :- HDTV in wide screen format (16:9) Provides the highest resolution and picture quality Combined with digitally enhanced sound technology HDTV and digital TV are not the same. Resolution has 720p and 1080i.

HD TV HDTV has available in 2 types. 1. INTEGRATED HDTV 2. HD-ready set

1.FRAME SIZE :  In pixels is defined as number of horizontal pixels * number of vertical pixels.  For example 1280*720 or 1920*1080.  Often the number of horizontal pixels is implied from context and is omitted,  As in the case of 720p and 1080p 2. SCANNING SYSTEM :  Is identified with the letter  “p” for progressive scanning OR  “i” for interlaced scanning. 3. FRAME RATE :  Is identified as number of video frames per second.  For interlaced systems an alternative form of specifying number of fields per second is often used..

 720p signal is made up of 720 horizontal lines. Each frame is displayed in its entirety on-screen for 1/30th of a second. This is know as progressive scan (hence the 'p'). The quality is like watching 30 photographic images in second on TV. .A 1080i signal comprises 1080 horizontal lines but all the lines are not displayed on-screen simultaneously. Instead, they are interlaced (hence the 'i'), i.e. every other lines is displayed for 1/60th of a second and then the alternate lines are displayed for 1/60th of a second. So the frame rate is still 30 frames per second, but each frame is split into two fields, which your brain then puts together subconsciously.

 1. AN INCREASE IN PICTURE RESOLUTION  2. 16:9 WIDESCREEN AS STANDARD  3. THE ABILITY TO SUPPORT MULTI- CHANNEL AUDIO SUCH AS DOLBY DIGITAL.

ParameterUHD-TVHD-TV Definition (Pixel)7680 x 4320 (33 Mio. Pixel) 1920 x 1080 (2 Mio. Pixel Aspect Ratio Bit resolution 16:09 10 to 12 16:09 8 to 10 Frame rate (Hz)50, 6024, 25, 30, 50, 60 Data rate (compressed)72 Gbit/smax. 2,49 Gbit/s

 International standard  Superior image quality  Minimum 25/30 frame rate capacity  High resolution  Color fidelity  16:9 aspect ratio

Movie production; Digital Cinema – movie distribution and exhibition; High-definition DVDs for packaged media and recording; Internet streaming and distribution; High-resolution video games consoles; Consumer home-movie making; Medical applications; Military and surveillance

When you start shopping, keep in mind that HDTV requires three parts. 1. A source, such as a local, cable or satellite HDTV station. 2. A way to receive the signal, like an antenna, cable or satellite service. 3. An HDTV set. Most people start with the set. You can choose, a) Integrated HDTV. b) HDTV Ready set.

 HOWEVER LOTS OF PROGRESS HAS BEEN IN THE FIELD OF HDTV, HDTV STILL HAS MUCH SLOWER RESOLUTION THAN 70mm FILM. IT’S A TIME OF MATTER BEFORE SOME WILL BEGIN PRESSURING FOR ANOTHERS INCREASE IN QUALITY.

 The image quality improvements brought by high-definition TV has been well received and generates great demand in the consumer market. Consequently, a similar trend can already be seen in the traditional video surveillance market.  HDTV-compliant network cameras deliver a resolution, color representation, 16:9 aspect ratio and frame rate that are in accordance with international standards, making them an appealing solution in surveillance situations that require high quality images.