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All About HDTVTCF April 2008
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They Look Great
50” Vizio
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All About HDTV - Outline
Digital TV (DTV) and High Definition (HDTV) Frequency Allocation What are Broadcasters Doing Where are the Signals Coming from Plasma, LCD and DLP Displays How to Hook Up HDTV to Your System HD Recording Consumer Guide
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Digital TV and HDTV
OTA Analog transmissions to cease in 2009 after over 50 years. DTV offers better picture quality – no snowy or degraded picture, no convergence problems
Each pixel separately generated Stereo and surround sound (5.1) built-in MPEG-2 compresses 1 Gb/s video stream One 6 MHz Channel can carry 20 Mbits/sec or
several DTV (HDTV and SDTV) sub channels and other data (8-VSB and QAM)
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Digital TV and HDTV(cont.)
DTV Formats – 480i, 576i, 720p, 1080i, 1080p (1080p Blue-Ray, HD-DVD only)
Native HDTV Formats - 720p or 1080i, up or down conversion is required
Aspect Ratios – 4:3, 16:9 – black stripes, missing foreheads or 300 lbs bodies
On-Screen Daily Schedules
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2008 TV Receivers
Sets with HD display and no tuners (HD ready or HD monitor)
Sets with HD display, NTSC/ATSC and QAM tuners with or without cable cards (most common)
Sets with SD display (LCD or CRT) and NTSC/ATSC tuner (least expensive)
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Frequency Allocation
Old Assignments: VHF (Ch. 2-13) and UHF (Ch. 14-68)
New Assignments: Upper VHF, lower UHF (Ch. 7-53)
Government Will Auction the Vacated Channels for $$ Billions, is issuing rebate coupons for converter boxes
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What are Broadcasters Doing
Broadcasters take advantage of uninformed public Saving on Quality for Profits – more channels, less HD Few Broadcasters provide a consistent true HD Signal Basic Cable May or May not Include Digital Channels Cable and satellite providers degrade the HD signal by
further compressing it Over-the-air still the best – not publicized and hushed
up by cable providers and retailers
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Transmission and Modulation
NTSC/ATSC/QAM Tuners
Video Stream1 Gbit/sec
+MPEG-2
20 Mbits/sec
QAM (Cable) 6 MHz
8-VSB (OTA)6 MHz
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Digital Transmission
6 MHz Channel
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Are You Watching HDTV?
Sleeping in the Garage Doesn't Make You a Car
Nearly half of the 24 million households with HDTVs don't actually watch high-definition programs
HDTV Material Doesn't Grow on Trees
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Where are the Digital Signals Coming from
Digital Cable Satellite (Dish Network) Over the Air – A well kept secret. An old
antenna, even rabbit ears will often do Blue Ray DVDs and other new formats
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Plasma, LCD and DLP Displays
Plasma – Generates its own light, vivid colors, best viewing angle, but subject to burn-in, ambient light a problem (glare, reflections)
LCD – Backlit, (Venetian blinds) good pastel colors, poor blacks, low power consumption, low weight, good in lighted areas, 42” or less
DLP – Reflected light (Rear projection), bright colors, relatively expensive, fragile, 50” and up,
www.howstuffworks.com/lcd2.htm
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Plasma Display
Panel Cross Section
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Plasma Display
Cell arrangement
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LCD Display
Polarization
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LCD Display
More Details
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DLP (Projection) Display
How it works
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How to Hook Up HDTV to Your System (A/V Components)
Over-the-air and cable combination Analog vs. digital cable (cable cards, boxes) Use of additional tuners (VCR, ATSC) Analog and digital audio to your HiFi Use with Laptop as Monitor DVD Player Games, computer and other components
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How to Hook Up HDTV to Your System (Inputs and Outputs)
Varies between Manufacturers and Models Composite - AVI (3 RCA cables) Component (5 RCA cables) HDMI Svideo + audio RGB (15 pins) + audio Analog Audio (Stereo) Digital Audio (5.1)
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How to Hook Up HDTV to Your System (Cable Types)
HDMI, RCA, Svideo, RGB
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How to Hook Up HDTV to Your System (OTA and Analog Cable)
Combining Over-the –air with analog cable
VCR
HDTV
Antenna
Cable AV1
DTV/TV
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Recording of HD/SD Programs
Lack of video outputs on most HDTV sets makes recording difficult (DRM raises its ugly head)
Recording to PC hard drive with external ATSC tuner
Regular VCR if analog output available from HDTV or digital cable box
TiVo recording to hard drive DVRs with built-in ATSC/QAM tuners and DVD
recording media coming down in price
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Pinnacle PCTV HD Stick
.
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HD Picture on PC Screen
.
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Current HD/SD Programming
Networks simulcast their main analog channel Plenty of weather channels News, sports, specials and some shows in HD PBS carries a separate HD channel with high
quality documentaries, cultural and science programs (3 hour operas from the MET, full concerts, etc)
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Government Coupon Program
Analog OTA transmission will cease on 2/17/2009
Between 1/1/08 and 3/31/09 you can call 1-888-388-2009 to apply 1-2 $40 Rebate coupons per household Coupons expire 90 days after issue ATSC to analog converters will give new
life to old TVs and VCRs
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Consumer Guide
Fit Size to Your Viewing Area Built-in ATSC/QAM tuner or HD-Ready Plasma. LCD or DLP Availability of Inputs and Outputs Price, warranties, repair cost Ask questions on alt.tv.tech.hdtv and
check http://www.avsforum.com
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Additional Resources
Converter box site: www.dtv2009.gov: Find out about OTA reception at your
home: www.antennaweb.org Quiz to tell if you are ready for HDTV:
www.dtvtransition.org: