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Ed's AV Handbook
Batting Practice for the AV Professional
and primer for the novice

Chapter 4  Page 7

Video Reproduction
TV Resolution

HV Resolution

UltraHD 8K, UltraHD, High Definition,
Enhanced Definition, Standard Defination, NTSC

Television picture resolution refers to its vertical and horizontal detail.  Vertical-resolution is the number of vertical-transitions, the number of horizontal-lines, traced across the screen top to bottom.  Horizontal-resolution is the number of horizontal-transitions, the number of pixels per horizontal line.

Analog NTSC TV

The original discontinued NTSC TV system had up to 525 lines of vertical resolution.  43 of its lines included horizontal & vertical synchronizing data.  That left a balance of 482 lines for the image.

However, the NTSC analog system did not produce all 482 lines sequentially or progressively.  Instead, NTSC used an interlaced method of two alternating fields to compose one video frame.

The first field traced the odd-numbered lines in 1/60th of a second.  The second field traced the even-numbered lines in the next 1/60th of a second.  NTSC completed a frame in 1/30th of a second, fast enough for the brain to perceive the video as a moving image.

As stated, NTSC offered up to 482 lines of vertical resolution.  However, the vertical resolution varied as interlaced scenes transitioned from one to the next. 
For example, a transition from all black to an all-white frame reduced the vertical resolution to 241 lines.  NTSC could only produce all 482 lines during a still picture frame.

NTSC video interlacing determined actual vertical resolution, while the video source determined horizontal resolution. 
DVD offers the best NTSC horizontal resolution, 720 pixels per line.  The LaserDisc horizontal resolution equaled 400 pixels, VHS videotape 240 pixels.

Digital Television

SDTV

Standard Definition Television, SDTV, has a vertical resolution of up to 480 interlaced lines.  Therefore, SDTV retains the same vertical resolution interlaced issues as NTSC TV.  But the absence of analog noise is an improvement over NTSC.  SDTV horizontal resolution ranges from 640 to 704 pixels per line. 
SDTV is a clear improvement over NTSC.

EDTV

Enhanced Definition Television, EDTV, is a significant improvement over NTSC and SDTV.  EDTV produces the video progressively line by line, which eliminates interlace issues.  EDTV offers a fixed vertical resolution of 480 lines by 704 pixels per line.

HDTV

High Definition Television offers three resolution options.
-- 720p by 1280   @ 60 frames per second with a 16:9 aspect ratio.  (broadcast)
-- 1080i by 1920  @ 60 frames per second with a 16:9 aspect ratio.  (broadcast)
-- 1080p by 1920 @ 60 or 24 frames per second.                               (non-broadcast)

720p (progressive) has a vertical resolution of 720 lines with a horizontal resolution of 1280 pixels per line at 60 frames per second (fps).

1080i (interlaced) results in a vertical resolution ranging from 540 to 1080 lines with 1920 pixels per line at 30 frames per second.

720p vs 1080i
The number of pixels per second is almost indistinguishable. 
However, sports broadcasters have favored 720p because it eliminates interlacing artifacts.

1080p high definition non-broadcast sources -- Blu-ray, computer media, and Internet streaming -- eliminate the interlacing issue.

All HDTV sources offer a broader palette of color than NTSC, SDTV, or EDTV.

Utltra-HD

UltraHD (UHD) UltraHDTV increases video resolution to 2160p by 3840 pixels per line @ 30fps, 60fps, or 120fps with a 16:9 aspect ratio. 
UltraHD also doubles the color gamut of HDTV.  UltraHD is often incorrectly referred to as 4K TV.

DCI 4K Standards

The Digital Cinema Initiative (DCI) defines theater standards: 
4K DCI 2.39:1 aspect ratio with 1716 lines by 4096 pixels per line.
4K DCI 1.85:1 aspect ratio with 2160 lines by 3996 pixels per line.
DCI is the real 4K standard.

8K UltraHD 

8K UltraHD (8K UHD) doubles UHD resolution to 7680p lines by 7320 pixel per line. 
UHD 8K televisions are currently available.  
However, 8K sources are not yet readily available. ( Jan 2021)

UltraHD Prerequisites 

UltraHD TV has 3 prerequisites, plus a 4th recommended option.  
Their absence will lead to downgraded video or a blank screen. 


1. HDMI 2.0 / 2.0a / 2.0b / 2.1

    - HDM 2.0 supports
       UltraHD @ 60fps with 18Gbps bandwidth.

    - HDMI 2.0a adds support
       for the HDR10 format
 
    - HDMI 2.0b adds support
       for the HLG HDR format.

    - HDMI 2.1 adds support for
      10bit HDR10+,
      12bit Dolby Vision
      48Gbsp bandwidth.

Handbook Note: 
Many 1st generation UltraHD televisions and video components are limited to HDMI 1.4 @ 30fps which compromise UltraHD performance.

2. HDCP 2.2 / 2.3

High-bandwidth Digital Content Protection encrypts digital video sources with a key that requires authentication from both the transmitting and receiving devices.  HDCP 2.2 is required for all UltraHD devices.  HDCP 2.3 is coming sometime in 2021.  There are three types of authentication devices.  The devices are embed integrated chips.

  The Three Devices
- Source device embed in BluRay players, cable boxes, satellite receivers, streaming devices.
- Repeater device embed in AV receivers, AV switchers.
- Sink device embed in the TV or projector.
Page 9 offers more explanation.

3. MPEG Compression 

    -- H.265 HEVC
    -- H.265 VCC will succeed HEVC in 2021

4. HDR Option

High Dynamic Range (HDR) expands UltraHD color volume.  Page 9 covers HDR in detail.    
This is considered the most significant television improvement since the introduction of color. 

Video Scaling

A TV displays a blurry mess if the source resolution does not match the TV resolution.  This became a widespread issue with the launch of HDTV in 1988.    
NTSC sources did not align with HDTV.

A DVD consists of 345,600 pixels, while an HDTV consists of 2,073,600 pixels.  They don't align.  Then HDTV does not align with UHD (4K) 4,147,200 pixels. 
UHD does not align with 8K UHD 8,294,400 pixels.  How can you view a DVD on a UHD or 8K TV?

Scaling resolves the issue.  Scaling up-converts the source resolution to interface and align with the TV resolution.

Initial types of scaling were essentially a math process.  They primarily divided the source pixels by the display resolution.  For example, it divided the DVD's 345,600 pixels into HDTV's 2.073,600 pixels. 

Scaling improved with adjacent pixels assessment.  Instead of solely dividing a pixel into more pixels, better faster processors compared adjacent pixels, then filter-adjusted their sharpness.  The improved scaling created better clearer images. 

Further improvement added multiple frame assessment to the adjacent pixel adjustment.  It samples video frames, then selects a filter process from a set of  predefined solutions.  The result reduces motion blur and noisy artifacts. 

The latest methods add a version of artificial intelligence.  AI scaling adds an extensive reference image database.  In real-time, the scaling computer/processor compares each frame to the database of images and then applies the best adjustment solution. 


Scaling methods are available in many proprietary versions.  The best solutions separate the best manufacturers from the others.

AI Tech


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Ed's AV Handbook   
Copyright 2007 Txu1-598-288 Revised 2021


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