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Digital Television & Home Theater Audio for Video Basic Acoustics How & Why We Hear Movie & Home Theater Sound-System Configurations, Including Surround Sound Digital Audio Formats: the Good, the Bad, and the Sublime. Sound Basics: What Is Sound? Sound = Traveling Waves Of Air Pressure

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Digital Television & Home Theater

  • Audio for Video

    • Basic Acoustics

    • How & Why We Hear

    • Movie & Home Theater Sound-System Configurations, Including Surround Sound

    • Digital Audio Formats: the Good, the Bad, and the Sublime.


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Sound Basics: What Is Sound?

  • Sound = Traveling Waves Of Air Pressure

  • Air Pressure Wave: Localized, Temporary, Sequential Increase + Decrease in Air Pressure Around Normal (15 lbs./sq. inch)

  • Each Wave Must Have Both A Positive (pressure increase) And Negative (pressure decrease) Part

    • Overall Air Pressure Cannot Change

  • Think Of Air Molecules Temporarily Bunching Up In Some Places and Spreading Out In Others. The Bunching Up Spreads Like Falling Dominos


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From William Vennard: Singing The Mechanism & The Technique


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Sound Basics: Frequency

  • A Sequential Increase & Decrease In Pressure Is Called A Cycle.

    • Think of It As A Single Wavelet.

  • A Cycle Takes A Finite Time To Complete

    • Pressure Variation Goes 0 + 0 - 0, or 0 - 0 + 0

  • Sustained Sounds With Repetitive Identical Cycles Have An Associated Fundamental Frequency, F

    • F = The Number Of Cycles Occurring Within A Second Of Time

    • Expressed in Hz. = Cycles/Second


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Sound Basics: Auditory Perception

  • When Sustained Sounds With Repetitive Air Pressure Waves Are Perceived By The Ear, They Give The Sensations Of Pitch & Loudness

    • More Cycles In A Given Span Of Time = Higher Pitched Sound

    • The Greater The Increase & Decrease In Air Pressure Variation Within Each Cycle = The Louder The Sound


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Sound Basics: Hearing Range

  • Pitch Is Perceived Logarithmically In Octaves

    • One Octave Increase = Doubling The Frequency

  • Human Hearing Covers 10 Octaves, From 20 Cycles/Second to 20,000 Cycles/Second

    • Everyday Sounds Are Usually 40 Cycles/Second to 12,000 Cycles/Second

    • The Critical Band For Speech Recognition is 500 Cycles/Second to 2,000 Cycles/Second


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Sound Basics: Wavelength

  • Air Pressure Waves Travel ~ 1,130 ft./sec.

    • A Cycle Of Air Pressure Variation That Takes A Finite Time To Complete Therefore Spreads Out Across a Finite Distance = It’s Wavelength

  • Sustained Sound With Repetitive Identical Cycles Having Fundamental Frequency F, Have Wavelength L Derived By:

    L Ft./Cycle = 1.13 Ft./Millisecond / F Cycles/Second

    • Note That The Higher The Frequency (& Pitch), The shorter The Wavelength


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Resonation & Perception

  • Several Air Pressure Waves Simultaneously Traveling Through The Same Space Will Add Together Linearly.

  • So Will Traveling Air Pressure Waves When Trapped Between Two Physical Parallel Boundaries.

    • At Each Boundary Some Sound Passes Through But Most Bounces In The Reverse Direction

    • The Waves Will Continue To Bounce Back And Forth Between Boundaries Until All The Sound Has Leaked Out.

  • Sustained Sounds Will Continually Feed New Air Pressure Waves To Bounce And Add Together Between The Boundaries



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Resonation & Perception A Resonator

  • For Most Frequencies, Multiple Bouncing Pressure Waves Will:

    • Momentarily Reinforce Each Other Some Places

    • Momentarily Oppose Each Other At Other Places

  • But With No Consistent Pattern.


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Resonation & Perception A Resonator

  • However, At A Few Frequencies Bouncing Pressure Waves Will Constantly Reinforce Each Other And Always At The Same Places

    • These Places Of Constantly Reinforcing Pressure Waves Are Called “Standing Waves”.

    • As Standing Waves Build In Intensity With Sustained Sound, More Sound “Leaks” Through The Boundaries To The Outside Until Equilibrium Is Reached.


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1 A Resonator

2

Long-Term Average

3

Standing Waves


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Resonation & Perception A Resonator

  • Which Frequencies Will Produce Standing Waves?

    • Only Those For Which The Distance Between Boundaries Is An Integer Multiple Of The Frequency’s Wavelength

    • I. E. When 1, 2, 3, 4, ... Wavelengths Will Perfectly Fit Between The Boundaries With No Pieces Left Over.


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Resonation & Perception A Resonator

  • Parallel Physical Boundaries Therefore Act As A Resonator & Filter. Put Sustained Broadband Noise In (Which Contains Many Frequencies):

    • Most Frequencies Will Be Attenuated.

    • A Few Will Be Strengthened and Projected.

    • The Frequencies That Are Strongly Resonated Reveal The Dimensions Of The Resonator.


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Resonation & Perception A Resonator

  • Real-World Hollow Objects Are 3-Dimensional & Have Many Non-Parallel Boundaries

    • Standing Waves Occur At Many More Frequencies And Vary In Strength.

    • Putting In Sustained Broadband Noise Will Result In Highly Unique And Complex Spectrum Of Resonated Frequencies: A Spectral Fingerprint Of The Physical Object!

    • Strong Survival Value In Discriminating How Strongly Each Frequency (Out Of A Broad Range Of Frequencies) Is Being Reinforced By An Object.


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Resonation & Perception A Resonator

  • Our Ears Are Spectrum Analysers

    • Inner Ears Compare Strengths Of Different Frequencies Coming From A Single Object.

    • We Can Associate Sounds We Hear With Objects We See, Even When We Can’t See Them!

    • Our Ears Report To Our Brains, Which Is Not Aware Of Separate Frequencies, But Instead Perceives Timbre - An Overall Sound Quality.


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From William Vennard: A ResonatorSinging The Mechanism & The Technique


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From Ralph Appleman: A ResonatorThe Science Of Vocal Pedagogy


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The Purpose of Hearing A Resonator

  • Scout Out Our Environment (for Predators and Food) Beyond Our Line Of Sight.

    • What is out there?!

    • Is It Moving Closer Or Further Away?!

    • Where Is It?!


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How We Hear A Resonator

  • What Is Out There?

    • Spectral analysis with either/both ears. (Previously explained)


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How We Hear A Resonator

  • What Is Out There?

    • Spectral analysis with either/both ears. (Previously explained.)

  • Is It Moving Closer Or Further Away?

    • Changes in volume with either/both ears. (Inverse Square Law.)


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How We Hear A Resonator

  • Where Is It?

    • Bianural Hearing: Comparing the same sound as heard by two physically separate, distinctly shaped ears:

      • Relative Loudness

      • Time Of Arrival

      • Head-Related Transfer Function


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How We Hear A Resonator

  • Where Is It?

    • Two Separate Perceptions of Environmental Sound

      • Localization - I can point to the direction of the sound (e.g a lion’s roar)

      • Envelopment - I am inside the sound (e.g. rain & thunder)







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How We Localize Sound A Resonator

What’s The Difference?

Head-Related Transfer Function


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Hi Fidelity/Home Theater Audio A Resonator

  • To Simulate Nature It Must Reproduce

    • Realistic Complex Acoustic Spectrum

      • Accurate Full-Range Speakers

      • High-End Electronics

    • Realistic Volume Levels/Volume Changes

      • Sufficient Power and Speaker Sensitivity

      • Accurate, Clean Micro and Macro Dynamics

    • Realistic Binaural Cues via Multiple Speakers:

      • Relative Loudness

      • Time Of Arrival

      • Head-Related Transfer Function


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Hi Fidelity/Home Theater Audio A Resonator

  • Monophonic Sound:

    • All sound sources sonically image at the speaker.


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Hi Fidelity/Home Theater Audio A Resonator

  • 2-Channel Stereophonic Sound:

    • Sound sources sonically phantom-image between and behind the speakers.

  • Can have multiple simultaneous sonic phantom images.

  • Can smoothly pan a sonic phantom image.

  • 2 Discrete Channels


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Hi Fidelity/Home Theater Audio A Resonator

  • Quadraphonic Sound

    • Sound sources sonically phantom-image between the front speakers, between the back speakers, but not between the side speakers.

  • 4 -> 2 Matrixed Channels and barely feasible Discrete


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Hi Fidelity/Home Theater Audio A Resonator

  • Matrixed 4 Channels into 2

    • 2 Channels – Lt & Rt provide:

      • Left Channel = Lt

      • Right Channel = Rt

      • Channel 3 = Lt + Rt

      • Channel 4 = Lt - Rt

    • Just 3 db Channel Isolation due to Inter-channel Bleeding.

    • Steering Logic Can Isolate Channels Further, But for Only One Phantom Image at a Time


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Hi Fidelity/Home Theater Audio A Resonator

  • Dolby Stereo (Theaters) Thanks, Star Wars Episode 4

    • Left/Center/Right Speakers Behind Screen + Single Surround Channel into Many Speakers for Envelopment

  • 4 -> 2 Matrixed Channels. Delayed, Frequency-Limited Surround Channel


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Hi Fidelity/Home Theater Audio A Resonator

  • Dolby Pro Logic (Home)

    • Left/Center/Right w. Center Above/Below the Display + Single Surround Channel into 2 Dipolar Speakers for Envelopment

  • 4 -> 2 Matrixed Channels. Delayed, Frequency-Limited Surround Channel


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Hi Fidelity/Home Theater Audio A Resonator

  • Digital 5.1 in Theaters

    • Left/Center/Right Speakers Behind Screen + Left Sur/Right Sur + Subwoofer

  • Discrete 5 Full-Range Channels + Discrete Subwoofer


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Hi Fidelity/Home Theater Audio A Resonator

  • Digital 5.1 – Home Configuration

    • Left/Center/Right w. Center Above/Below the Display + Left Sur/Right Sur + Subwoofer

-30o 0o +30o

-120o +120o

  • Discrete 5 Full-Range Channels + Discrete Subwoofer


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Hi Fidelity/Home Theater Audio A Resonator

  • Digital 6.1 in Theaters Thanks, Star Wars Episode 1

    • Left/Center/Right Behind Screen + Left Sur/Back Sur/ Right Sur + Subwoofer

  • 5 Channels Discrete + Subwoofer + Back Channel Matrixed


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Hi Fidelity/Home Theater Audio A Resonator

  • Digital 7.1 – Home Configuration

    • Left/Center/Right w. Center Above/Below the Display + Left Sur/Left Back/Right Back/Right Sur + Sub

-30o 0o +30o

-90o +90o

-150o +150o

  • Discrete 7 Full-Range Channels + Discrete Subwoofer


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Digital Television A Resonator


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Digital Television A Resonator

  • It’s Coming February 17, 2009. Do you know where your programs are?


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Digital Television A Resonator

What Is It?

  • A Totally New Television System


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Digital Television A Resonator

What was wrong with the old Analog system?


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Digital Television A Resonator

What was wrong with the old Analog system?

  • 1930’s Technology


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Digital Television A Resonator

What was wrong with the old Analog system?

  • 1930’s Technology

  • Black & White


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Digital Television A Resonator

What was wrong with the old Analog system?

  • 1930’s Technology

  • Black & White

  • Monophonic Sound


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Digital Television A Resonator

What was wrong with the old Analog system?

  • 1930’s Technology

  • Black & White

  • Monophonic Sound

  • Maximum Screen Size: 19 inches


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Digital Television A Resonator

What was wrong with the old Analog system?

  • 1930’s Technology

  • Black & White

  • Monophonic Sound

  • Maximum Screen Size: 19 inches

  • Kluged Retrofits: Still not close to photographic and larger-than-life quality of movies.


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Digital Television A Resonator

Why Now? Actually it started in the 1980s


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Digital Television A Resonator

Why Now? Actually it started in the 1980s.

  • Japanese Developed Analogue High Definition TV & Began Marketing It in the US.


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Digital Television A Resonator

Why Now? Actually it started in the 1980s.

  • Japanese Developed Analogue High Definition TV & Began Marketing It in the US.

  • Congress Feared Further Technology & Patent Drain


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Digital Television A Resonator

Why Now? Actually it started in the 1980s.

  • Congress asked American companies to develop a more/better American System

    • Offered no government funding but instead enticed with opportunities for patent royalties.

    • Would conduct “fly-off” of all submitted systems.

    • 4 teams of companies entered the competition.


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Digital Television A Resonator

Why Now? Then Why Did It Take So Long To Develop?

  • Broadcasters insisted on being included; i.e. the high definition system would have to fit within current licensed stations (6 MHz Bandwidth/Channel).

    • The Japanese system had required higher bandwidth cable and satellite distribution.


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Digital Television A Resonator

Why Now? Then Why Did It Take So Long To Develop?

  • Broadcasters insisted on being included; i.e. the high definition system would have to fit within current licensed stations (6 MHz Bandwidth/Channel).

    • The Japanese system had required higher bandwidth cable and satellite distribution.

  • FCC conducted not one, but three flyoffs over 10 years and found no system satisfactory.


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Digital Television A Resonator

Why Now? Then Why Did It Take So Long To Develop?

  • Broadcasters insisted on being included; i.e. the high definition system would have to fit within current licensed stations (6 MHz Bandwidth/Channel).

    • The Japanese system had required higher bandwidth cable and satellite distribution.

  • FCC conducted not one, but three flyoffs over 10 years and found no system satisfactory.

  • During the third flyoff, one team proposed a digital system which showed promise.


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Digital Television A Resonator

Why Now? Then Why Did It Take So Long To Develop?

  • The four competing teams of companies and research institutions were about to drop out of the development: over 10 years of IR&D with no return in sight.


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Digital Television A Resonator

Why Now? Then Why Did It Take So Long To Develop?

  • The four competing teams of companies and research institutions were about to drop out of the development: over 10 years of IR&D with no return in sight.

  • The FCC suggested that the four teams agree to share patent royalties and combine efforts to use the best of all proposed systems.


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Digital Television A Resonator

Why Now? Then Why Did It Take So Long To Develop?

  • The four competing teams of companies and research institutions were about to drop out of the development: over 10 years of IR&D with no return in sight.

  • The FCC suggested that the four teams agree to share patent royalties and combine efforts to use the best of all proposed systems

  • This Grand Alliance completed development of the current “ATSC” system in the mid 1990s and the FCC adopted it in 1997.


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Digital Television A Resonator

What Is Better About Our New “ATSC” Television System?


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Digital Television A Resonator

What Is Better About Our New “ATSC” Television System?

  • Needs Fewer Channels


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Digital Television A Resonator

What Is Better About Our New “ATSC” Television System?

  • Needs Fewer Channels

  • Versatile Content


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Digital Television A Resonator

What Is Better About Our New “ATSC” Television System?

  • Needs Fewer Channels

  • Versatile Content

  • HDTV Options:

    • Photographic Picture

    • Wide-Screen Like Movies

    • Discrete Surround Sound


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Digital Television A Resonator

  • Picture Quality

    • Much Higher Resolution: 1 or 2 million pixels versus 230,000 for analogue broadcast or 345,000 for DVD


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Digital Television A Resonator

  • Picture Quality

    • Much Higher Resolution: 1 or 2 million pixels versus 230,000 for analogue broadcast or 345,000 for DVD

    • Wider Color Gamut - More Saturated Colors


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Digital Television A Resonator

  • Picture Quality

    • Much Higher Resolution: 1 or 2 million pixels versus 230,000 for analogue broadcast or 345,000 for DVD

    • Wider Color Gamut - More Saturated Colors

    • Wider Color Gamut - Many More Hues


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Digital Television A Resonator

  • Picture Quality

    • Much Higher Resolution: 1 or 2 million pixels versus 230,000 for analogue broadcast or 345,000 for DVD

    • Wider Color Gamut - More Saturated Colors

    • Wider Color Gamut - Many More Hues

    • Better Color Spatial Resolution - Patterned Versus Pastel Shirts


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Digital Television A Resonator

  • Wide-Screen Aspect Ratio

    * * * *

    * * * *

    * * * *

    * * * *

    Resolution 4 Hor. X 4 Vert. = 16 Pixels

    Aspect Ratio 4:4 or 1.0 to 1.0


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Digital Television A Resonator

  • “Academy” Aspect Ratio

    * * * *

    * * * *

    * * * *

    Resolution 4 Hor. X 3 Vert. = 12 Pixels

    Aspect Ratio 4:3 or 1.33:1.0

    Analogue TV Has Theoretical 640 Hor. X 480 Vert. = Aspect Ratio 1.33:1.0


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Digital Television A Resonator

  • Wide Aspect Ratio

    • Typical Movie Aspect Ratios - 1.33:1.0 (Edison),1.66:1.0, 1.85:1.0, 2.05:1.0, 2.35:1.0

    • How can HDTV accommodate all these aspect ratios? Take the geometric mean - 1.78:1.0

    • Actual Pixel Counts

      • 1280 X 720 = ~1 Megapixel; Refreshed 60 Times/Sec.

      • 1920 X 1080 = ~2 Megapixels; Refreshed 30 Times/Sec.


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Digital Television A Resonator

3. 5.1 Dolby Digital Surround

  • Left Front, Center Front, Right Front, Left Surround, Right Surround, Subwoofer

  • Also Carries Regular Stereo For TV Speakers


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Digital Television A Resonator

What Happens To My Old TVs When Analogue TV Is Turned Off on Feb 17, 2009?

  • Will need a converter box

    • Satellite receiver

    • Cable Box

    • Over-The-Air Box

  • Picture will still be standard definition on old TV, and will be letterboxed to accommodate wide-screen programs (or else 1. the sides of the picture will be cut off or 2. everyone will look really thin!)


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Digital Television A Resonator

The Coupon Progam

  • Nielson estimates 14.3 million US households rely on over-the-air TV. That’s 12% of the nation’s households.

  • Each household can apply for up to 2 $40. coupons to spend on ATSC digital tuner boxes for analog TVs.

  • Congress has allotted $1.5 B for the program to be administered via the National Telecommunications and Information Administration. = 33.5 Million Coupons.

  • Boxes sell for $50. - $70. 250 major retailers have been approved to sell them.

  • Boxes only have Composite or Coax connector, no S-Video or Component – only output standard definition.

  • ~ 13 million coupons distributed so far.

  • http://www.ntia.doc.gov/dtvcoupon/


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Must have:

  • ATSC Tuner


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Must have:

  • ATSC Tuner (Over The Air)

  • QAM Tuner (Basic Cable)


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Must have:

  • ATSC Tuner (Over The Air)

  • QAM Tuner (Basic Cable)

  • Pixel Count At Least 1280 X 720 (“720p”)


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Must have:

  • ATSC Tuner (Over The Air)

  • QAM Tuner (Basic Cable)

  • Pixel Count At Least 1280 X 720 (“720p”)

  • Diagonal Size = ~ 1/2 Viewing Distance


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Nice to have:

  • HDMI Hookup (Still Has Bugs)


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Nice to have:

  • HDMI Hookup (Still Has Bugs)

  • Cable Card


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Nice to have:

  • HDMI Hookup (Still Has Bugs)

  • Cable Card

  • Pixel Count: 1920 X 1080 (“1080I” or “1080P”)


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Nice to have:

  • HDMI Hookup (Still Has Bugs)

  • Cable Card

  • Pixel Count: 1920 X 1080 (“1080I” or “1080P”)

  • 120 Hz Refresh

    • Eliminates Image Persistence & Judder


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Nice to have:

  • HDMI Hookup (Still Has Bugs)

  • Cable Card

  • Pixel Count: 1920 X 1080 (“1080I” or “1080P”)

  • 120 Hz Refresh

    • Eliminates Image Persistence & Judder

  • 3D Ready


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Digital Television A Resonator

What do I need to know to buy a new HDTV? Nice to have:

  • HDMI Hookup (Still Has Bugs)

  • Cable Card

  • Pixel Count: 1920 X 1080 (“1080I” or “1080P”)

  • 120 Hz Refresh

    • Eliminates Image Persistence & Judder

  • 3D Ready

  • More Color Ready

    • Deep Color (10-14 bits/Primary)

    • xvYCC Extended Color (LED, Laser Illumination)


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Digital Television A Resonator

What Do I Need To Know To Buy A New TV? How Do I Judge Picture Performance?

  • Brightness (Red Herring - only relevant for very bright rooms)


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Digital Television A Resonator

What Do I Need To Know To Buy A New TV? How Do I Judge Picture Performance?

  • Brightness (Red Herring - only relevant for very bright rooms)

  • Color Accuracy – Do they look natural?


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Digital Television A Resonator

What Do I Need To Know To Buy A New TV? How Do I Judge Picture Performance?

  • Brightness (Red Herring - only relevant for very bright rooms)

  • Color Accuracy – Do they look natural?

  • Shadow Detail


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Digital Television A Resonator

What Do I Need To Know To Buy A New TV? How Do I Judge Picture Performance?

  • Brightness (Red Herring - only relevant for very bright rooms)

  • Color Accuracy – Do they look natural?

  • Shadow Detail

  • Instantaneous Contrast


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Digital Television A Resonator

What Do I Need To Know To Buy A New TV? How Do I Judge Picture Performance?

  • Brightness (Red Herring - only relevant for very bright rooms)

  • Color Accuracy – Do they look natural?

  • Shadow Detail

  • Instantaneous Contrast

  • Motion Persistence?


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Digital Television A Resonator

What Do I Need To Know To Buy A New TV? How Do I Judge Picture Performance?

  • Brightness (Red Herring - only relevant for very bright rooms)

  • Color Accuracy – Do they look natural?

  • Shadow Detail

  • Instantaneous Contrast

  • Motion Persistence?

  • Contouring?


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Digital Television A Resonator

What Do I Need To Know To Buy A New TV? How Do I Judge Picture Performance?

  • Brightness (Red Herring - only relevant for very bright rooms)

  • Color Accuracy – Do they look natural?

  • Shadow Detail

  • Instantaneous Contrast

  • Motion Persistence?

  • Contouring?

  • Off Axis Viewing (Depends on seating).

    • Brightness Diminishes

    • Colors Change


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Digital Television A Resonator

What Type Of HDTV Format Should I Buy?

  • Rear Projection - Best Value even though disappearing.

    • New models are no deeper than Flat Panels on their stands.

    • Still best for screen sizes ≥ 60”

  • Front Projection - Best to Suspend Disbelief

  • Flat Panel – Lifestyle Choice, Lifestyle Cost. Vary Greatly in Picture Quality.


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Digital Television A Resonator

What Type Of HDTV Technology Should I Buy?

Alphabet Soup, But You Need to Know:

  • 3LCD Front Projectors and Rear Projection Sets

    • Screen Door Effect - Acceptable Pixel Fill

    • Mediocre Contrast - but gradually improving

    • Mediocre Blacks - but gradually improving

    • Mediocre Off Axis Viewing (Rear Projection)

    • Good Brightness

    • Brightness Ages Some, but Restores w. New Bulb

    • Bulb Life 2000 - 4000 Hours. Cost $300. - $400.

    • Cheapest Projectors and Projection Sets


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Digital Television A Resonator

What Type Of HDTV Technology Should I Buy?

Alphabet Soup, But You Need to Know:

  • DLPFront Projectors and Rear Projection Sets

    • Color Wheel Can Cause Fringing - hence multispeed.

    • Extended Color Gamut with Optional 6 Primary Colors

    • Screen Door Effect - Very Good Pixel Fill

    • Good Contrast - and keeps improving

    • Good Blacks - and keeps improving

    • Mediocre Off Axis Viewing (Rear Projection)

    • Good Brightness

    • Brightness Ages Some, but Restores w. New Bulb

    • Bulb Life 2000 - 4000 Hours. Cost $300. - $400.

    • Wide Range Of Price Performance.

      • 3 DLP the Best & Costliest


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Digital Television A Resonator

What Type Of HDTV Technology Should I Buy?

Alphabet Soup, But You Need to Know:

  • LCOS (D-ILA & SXRD)Front Projectors and Rear Projection Sets

    • Screen Door Effect - Very Good Pixel Fill

    • Good To Great Contrast

      • Some D-ILA is Best in Industry

    • Good To Great Blacks

    • Mediocre Off Axis Viewing (Rear Projection)

    • Good Brightness

    • Brightness Ages Some, but Restores w. New Bulb

    • Bulb Life 2000 - 4000 Hours. Cost $300. - $400.

    • Price Competitive with DLP


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Digital Television A Resonator

What Type Of HDTV Technology Should I Buy?

Alphabet Soup, But You Need to Know:

  • Plasma Flat Panels

    • Digital Picture Resolution - some 1920 X 1080, many 1346 X 768, Beware 1024 X 768 (43 inch)

    • Screen Door Effect - Very Good Pixel Fill

    • Good To Great Contrast - Rivals CRT

    • Good to Great Blacks - Rivals CRT

    • Superb Off Axis Viewing - Rivals CRT

    • Good Brightness

    • Rich Colors

    • 40,000 Hour Predicted Life But Will Lose Brightness w. Age

    • Susceptible to Burn-In

    • Expensive, But Cheaper Than Flat Panel LCD for Large Sizes


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Digital Television A Resonator

What Type Of HDTV Technology Should I Buy?

Alphabet Soup, But You Need to Know:

  • LCD Flat Panels

    • Digital Picture Resolution - Most 1920 X 1080, Some 1280 X 720, Beware 1080 X 1080, Many SD (Smaller)

    • Brightest Display Technology

    • Least Refined Display Technology - Digital Grain

    • Screen Door Effect - Acceptable Pixel Fill

    • Mediocre Contrast - But Improving w. Each Generation

    • Mediocre Blacks - But Improving w. Each Generation

    • Poor Off Axis Viewing - Brightness and Color Shifts

    • Wide Range of Picture Quality & Prices, but …

    • Getting Ever Cheaper To Produce - Rivals CRT in Cost for Small Screen Sizes and Is Sexier

    • Will Eventually Rule The Mass Market


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Digital Television A Resonator

What Happens When I Get The Set Home? Programming Sources:

  • Over-The-Air Free: All local stations now have digital channels. Needs a good antenna.

    • During set-up your set will scan for them and store.


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Digital Television A Resonator

What Happens When I Get The Set Home? Programming Sources:

  • Over-The-Air Free: All local stations now have digital channels. Needs a good antenna.

    • During set-up your set will scan for them and store.

  • Time-Warner Cable: Some local digital stations available but not NBC or WB. + Optional HD Cable Network “Tier” + HD Premium Channels Available


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Digital Television A Resonator

What Happens When I Get The Set Home? Programming Sources:

  • Over-The-Air Free: All local stations now have digital channels. Needs a good antenna.

    • During set-up your set will scan for them and store.

  • Time-Warner Cable: Some local digital stations available but not NBC or WB. + Optional HD Cable Network “Tier” + HD Premium Channels Available

  • Satellite: No local digital channels available yet.

    • DirectTV: More HD Every Week As Cable Networks Convert. Rumored Reformatted to 1440 X 1080

    • Dish Network: More HD Every Week As Cable Networks Convert. Better Picture Quality. Start of 1080P PPV


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Digital Television A Resonator

“Cable” Networks In HD – Already Obsolete!

  • Basic Networks:

    A&E Animal Planet Discovery ESPN

    ESPN2 Food Network Golf Channel HGTV

    National Geog. Science Channel TBS TLC

    TNT NFL

  • Premium Networks:

    Big 10 Cinemax HBO Showtime Starz

  • HD Only Networks:

    HDNet HDNet Movies HD News HD Theater Universal HD

  • Voom HD Only Networks (Dish Network Satellite Only):

    Animania Equator Family Room Film Fest

    Gallery Gameplay Kung Fu MHD

    Monsters Rave Rush Treasure

    Ultra World Cinema WorldSport


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Digital Television A Resonator

Collecting HD Programs

  • Digital VHS

    • Use D-VHS or S-VHS Tape

    • 2 1/2 Hrs HD/Tape - 3 hours of TV Minus Commercials

    • Simple Operation via Firewire from DVR

    • Also Records/Plays Regular Tapes

    • HD Movies Available on D-Theater Tapes for 5 Years

  • Blu-Ray:

    • Different Dimensions From DVD

    • Require New Factories To Produce

    • Most Discs So Far Are Single Layer

    • 25 Gbytes/Layer

    • Starting Price: $400.

    • Disc Starting Price: $25. Most ≥$35.

    • Full Spec Players Just Now Becoming Available


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Digital Television A Resonator

Collecting HD Programs

  • HD-DVD: Format War Loser

    • Discs Have Same Structure As DVDs

    • Discs & Players Are Cheaper To Produce

    • Discs Can Be Produced In Regular DVD Factories

    • Most Discs Are Dual Layer

    • 15 Gbytes/Layer (but most X 2)

    • More Interaction Capability; Fully Ramped Up from Start

    • Consistent, Intuitive Disc Menu System

    • Some Dual Discs: SD & HD on Same Disc

    • Player Prices Start $150.


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