Ed's AV Handbook.com
Home Theater & High Fidelity Stereo Audio
Batting practice for the audio/video pro and a primer for the novice
Index by chapter subject
Ed's AV Blog & NEWS
Chap 1 AV Terminology
Chap 2 Physics
Chap 3 Audio
Chap 5 AV System Sequence
Chap 6 The Room, Speaker, & TV
Chap 7 Acoustical Strategy
Chap 8 Home Theater by Design
Chap 9 Sales Training
Chap 10 Business & Marketing
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The view from our minds eyeOur brain has a need to make the universe orderly. For example, a still picture can be sliced and diced into an array of small dots or pixels. Stand back and our brain reassembles the dots as a coherent image of the original picture. An example is a photo in a daily newspaper.
A moving picture scene can be divided into a sequence of still pictures. If the 'stills' are repeated fast enough our brain perceives the 'stills' as a moving picture. This is the foundation for creating movies, animation, and television.
Our mind’s eye also recognizes a rainbow of color from
a color additive system. The three primary colors of light --
red, green, & blue -- can be mixed to produce all color.
As motion picture film, a TV camera divides a moving image into a sequence of still picture frames. Similar to the newspaper photo, each still frame is divided into pixel dots. Each pixel dot of light is converted into a stream of voltage. Each pixel stream of voltage is reconverted into sequential framed stills of illuminated pixels on a television screen.
The TV Camera
Handbook Note: A photo diode converts a stream of light
to a steam of electrons.
The sequence begins as the prismatic lens assembly of a
TV camera separates light into broad rainbow paths of color.
The red, green, and blue paths are selected and targeted at a dedicated (one for each color) pixel array of photo diodes mounted on a Charge Couple Device (CCD).
Each of the three frames of CCD photo diode arrays are electronically scanned at
60* frames per second, top to bottom, left to right, line by line, pixel by pixel. Each photo diode pixel of a CCD array produces a modulating stream of electrical voltage. The three CCD paths of voltages are a modulating analog of the original red, green, blue light. Those voltages are ultimately reconverted to illuminated pixel framed arrays of the original sequence of still frames on a television screen.
*Handbook Note: The C.I.E. Rec. 2020 UltraHD specification added the frame rate option of 120 fps.
This option has not yet been used in consumer electronic products. It is still a commercial project.
120fps is waiting for the full implementation of Rec 2020.
|Ed's AV Handbook.com
Batting Practice for the AV Pro and a Primer for the Novice.
Copyright 2007 Txu1-598-288 Revised 2018