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
- 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 > next
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 nearly all color.
The TV CameraAs 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 dot, a pixel of light, is converted into a stream of voltage.
This video sequence of images begins as the prismatic lens assembly of a TV camera separates light into rainbow paths of color. The red, green, and blue paths are targeted at a dedicated (one for each color) pixel array of photo diodes mounted on a Charge Couple Device (CCD).
The three CCD arrays are electronically scanned at 60* frames per second, top to bottom, left to right, line by line, pixel by pixel. Each produces a modulating stream of voltage that is a modulating analog of the original red, green, blue light. The voltages are ultimately reconverted into 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