Content contribution via satellite via terrestrial lines Cable
ﺍﺳﺘﻮﺩیﻮ ﺗﻮﺯیﻊ ﺍﺭﺳﺎﻝ Content contribution • via satellite • via terrestrial lines • Cable / Fiber Play out platform • Encoding • Statistical multiplex • ESG • Encryption • Digital Rights Management • Interactive services • Net management Content distribution • via satellite • via terrestrial پﺨﺶ Transmission network ﺻﺪﺍ ﻭ ﺳیﻤﺎی ﺟﻤﻬﻮﺭی ﺍﺳﻼﻣی ﺍیﺮﺍﻥ
Client devices can catch DVB-H ESG ﺻﺪﺍ ﻭ ﺳیﻤﺎی ﺟﻤﻬﻮﺭی ﺍﺳﻼﻣی ﺍیﺮﺍﻥ KDA: KMS Device Agent KMS: Key Management Syste Encoder + Scrambler Quantum Gig T 600 IPE Modulator SDIO plug in KDA USB receivers Sagem My. Mobile. TV Control Word (CW) ECMs EMMs Irdeto PIsys offers: CA applet State-of-art security Numerous business models Simplicity of use Ease of integration LG KU 950 Advanced bandwidth LG management. U 900 Irdeto CA Control System (PIsys) Samsung P 910 Samsung P 940 Samsung P 930 29
Client devices with already embedded CAS SW ﺍیﺮﺍﻥ Key ﺻﺪﺍ ﻭ ﺳیﻤﺎی ﺟﻤﻬﻮﺭی ﺍﺳﻼﻣی Quantum PMP DVB-H Monitor Gigabite LG T 600 LG KU 950 Windows Mobile GSM Mobile handset With DVB-H receiver
HDTV
Extreme HD Topics • • • Introduction and Objective HDTV basics Aspect ratios and scanning Display technologies Equipment connections and interfaces • Terrestrial HDTV
question #1 • What is the difference between HDTV and SDTV? • Bitrate is about 5 times greater (Better quality picture!) • Aspect ratio is 16 X 9 vs. 4 X 3 (Wide screen view!) • Audio is most often Dolby AC 3 (Higher quality sound!)
Compare the Resolutions Resolution Lines/Columns Frames / Second Comments 625 i 625/720 Up to 25 Lowest wide screen resolution 720 p 720/1280 Up to 50 Less motion artifacts 1080 i 1080/1920 Up to 25 Interlace artifacts 1080 p 1080/1920 Up to 50 Requires lots of bandwidth
Aspect Ratios • • 4 x 3 16 x 9 1. 85 : 1 2. 35 : 1 Standard TV (Also 1. 33 : 1) Widescreen TV (Also 1. 78 : 1) Typical Movie Format Typical Wide Movie Format
Aspect Ratios 1. 33 : 1 (4 x 3) 1. 85 : 1 1. 78 : 1 (16 x 9) 2. 35 : 1
Standard Screen Letterboxing
4 X 3 Content on Widescreen 1. 33 : 1 on 16 x 9 screen
question #2 • Which is better…. 720 p or 1080 i? • What is this “p” and “i”? (Great debate of progressive and interlace. ) • What does the monitor support? (Some monitors don’t support both. ) • Do you watch a lot of sports? (Lots of horizontal action is better in 720 p. )
Interlace vs. Progressive Interlace Scan Progressive Scan
Question #3 • What is the best kind of display for HDTV? – How big is the room? – Are there lots of windows? – Where do you need to place the monitor? – How many people are going to watch? Isn’t bigger better?
Display Technologies • Direct View – CRT, Plasma, LCD, LED • Rear Projection TV (RPTV) – CRT, LCD, DLP • Front Projector – CRT, LCD, DLP, LCOS
Direct view • CRT – Cathode Ray Tube • Plasma • LCD – Liquid Crystal Display • LED – Light Emitting Diode • OLED – Organic Light Emitting Diode
Display technologies • CRT - CRT monitors draw the lines one after the next, from top to bottom to make an entire frame. Generally speaking they have pleasing color balance performance and wide viewing angles. Because of their use of vacuum tubes, the displays can’t be constructed much larger than 40” or so. CRT
Display technologies • LCD – LCD HDTV monitors work by casting light through an array of cells sandwiched between two polarized planes. LCD monitors are less expensive than CRTs to manufacture and come in both flat panel and rear projection varieties. Flat panel, directview monitors have become popular as computer and DTV monitors as they are bright, use less electricity than CRTs, and have a relatively long life span. LCD
Display technologies • Plasma – Like LCD monitors, plasma HDTV sets are thin and are made up of cells that correspond to pixels sandwiched between glass plates. Plasma cells contain three separate gas-fill sub-cells, one for each color. When a current is applied to a sub-cell, it ionizes the gas emitting ultraviolet light. The ultraviolet light in turn excites fluorescent substances in the subcells that emit red, blue or green light. Plasma
Display technologies • DLP – Digital light processing is a technology used in projection displays. In DLP monitors, light is reflected off an array of microscopic hinged mirrors. Each tiny mirror corresponds to a visible pixel. The light is channeled through a lens onto the surface of the screen. Single chip DLP projectors can display 16. 7 million colors. 3 -chip projectors can display 35 trillion colors.
Display technologies • LED-LED and LCD monitors are based on the same basic technology for image display but differ in the kind of backlighting used. While LCD monitors use cold cathode fluorescent lamps for backlighting, LED monitors use light emitting diodes. This is the main difference between the two display technologies. So LEDs are a type of LCD monitors.
Rear Projection TV CRT LCD DLP
Front Projection CRT LCD DLP
question #4 • How do I hook this up the right way? – Video Analog Component or Digital? – Audio Stereo analog or Dolby® digital optical?
Component Connections • YPr. Pb – Separate Luminance and Chrominance • RGB – Red, Green, Blue separation – Compatible with computer monitors
Digital Connections • DVI – DVI-CE, HDMI – EIA-861 – DVI-D, DVI-I, Panel Link • 1394 – Firewire, i. Link – IEEE 1394 -1995, 1394 a, 1394 b
DVI • EIA-861 • DVI-CE (now HDMI) – High Definition Multimedia Interface • Up to 5 Gbs (Dual) 2. 5 Gbs (Single) • Supports HDCP Copy Protection • 7. 5 M Specification, Longer with repeaters
DVI connectors (DVI D) Digital Only (DVI I) Digital & analog
DVI vs HDMI DVI HDMI
1394 Connectors 4 Pin Unpowered 6 Pin Powered 4 to 6 Pin adapter cable
HDCP Copy Protection • Modes – Display Protected – Copy Never – Copy One Generation – No More Copies – Copy Freely – Revoke Device • Analog Component Connections – May be turned ON for unprotected content. – May be turned OFF for protected content. – May have reduced resolution for protected content.
question #5 • What is different about HDTV over satellite, cable and off-air? – Modulation – Frequencies – System information data (PSIP)
Modulation Formats • • • VSB – NTSC 8 VSB – New ATSC (USA) COFDM – DVB-T (Europe) QPSK – Current DBS SDTV 8 PSK – Current DBS HDTV QAM - Cable
8 VSB Waveform • 8 -ary Vestigial Sideband • 10. 762237 MHz Symbol Rate • Rate 2/3 FEC • 19. 39 Mbps Transmission Rate • 6 MHz Channel Bandwidth
Compare 8 VSB and NTSC
DTV Signal Impairments • Multipath (signal reflections) • Weak signal (noise) • Electrical noise (impulse, appliances, lightning) • Co-channel / adjacent channel interference • Land mobile interference (2 -way, CB, ham) • Coax system intermod/reflections
- Slides: 72