all about hdtv tcf april 2009
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All About HDTV TCF April 2009. 1. They Look Great. 50” Vizio. All About HDTV - Outline. Digital TV (DT) 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 - PowerPoint PPT PresentationTRANSCRIPT
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All About HDTVCass Lewart © 200011
All About HDTVTCF April 2009
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They Look Great
50” Vizio
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All About HDTV - Outline
Digital TV (DT) 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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Analog vs. Digital TV (DT)
OTA Analog transmissions ceased in 2009 after over 50 years. DT offers better picture quality – no “snow”, no geometric distortion, 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 Mb/sec or
several DT (HDTV and SDTV) sub channels and other data (8-VSB and QAM)
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Digital TV and HDTV (cont.)
DT 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-lb bodies
On-Screen Daily Schedules
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2009 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, issued 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
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 – An old antenna, even
rabbit ears will often do Blue Ray DVDs and other new formats
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Over the Air (OTA) Transmission
Free and of excellent quality No such thing as an HD Antenna Depending on location – Rabbit ears, a
good antenna on the roof or in attic An inexpensive RF amplifier may help For available channels, signal strength
and directions: www.antennaweb.org
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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 (cont.)
Cell arrangement
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LCD Display
Polarization
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LCD Display (cont.)
More Details
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DLP (Projection) Display
How it works
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How to Hook Up HDTV to Your A/V System
Typical Input/Output Panel in Back of the TV
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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 (3 RCA cables) – OK quality Component (5 RCA cables) – Excellent quality HDMI – Excellent quality but DRM restrictions S-Video + audio – Good quality 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, S-Video, RGB
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How I Hooked Up HDTV to My 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 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 and cooking 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 ceased on 2/17/2009
Between 1/1/08 and 3/31/09 you could call 1-888-388-2009 to apply 1-2 $40 Rebate coupons per household Coupons expire 90 days after issue ATSC OTA to analog converters will give
new life to old TVs and VCRs
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D/A Converter Hook Up
.
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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: Quiz to tell if you are ready for HDTV:
www.dtvtransition.org: