Download Newnes Guide to TV and Video Technology by Eugene Trundle (Auth.) PDF

By Eugene Trundle (Auth.)

This ebook is a mix of 2 "Beginner's guides": "Colour tv" and "Videocassette Recorders", that have been revised and up to date for this unmarried quantity. The e-book assumes a easy knowledgee of electrics and mechanics and is aimed toward the layman, scholars and technicians and covers the technicalities of television and VTR perform. themes contain the buddy color process, transmission and reception, MAC encoding and satellite tv for pc, cable televsion, the advance of video tape recording, sign processing and the care, operation and upkeep of VTRs. Eugene Trundle is additionally the writer of "Television and Video Engineer's notebook"

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Newnes Guide to TV and Video Technology

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The eye tends to retain an image for around 80 milliseconds after it has disappeared, and advantage is taken of this in both television and cinematography, where a series of still frames create the illusion of a continuous 29 moving picture. Other important characteristics of the eye are its relative insensitivity to coloured detail in a scene, and its failure to respond equally to all colours. Its greatest sensitivity is in the region of yellow/green, w i t h lesser response in the areas of red and particularly blue.

The subcarrier is modulated in a special way by colour-difference signals, of which there are three but only two of them need to be transmitted. 39 The three colour-difference signals are red minus the luminance signal, green minus the luminance signal, and blue minus the luminance signal. By red, green and blue is meant the primary-colour signals delivered by the colour camera, while the luminance signal is the Y c o m p o n e n t as defined by the expression given earlier. Thus, in simple algebraic terms the three colour-difference signals are: R - Y, G - Y and B - Y.

7. The master sync-pulse generator, t h e n , produces an o u t p u t at subcarrier frequency, and this is fed into two amplifiers w h i c h produce t w o subcarrier outputs, but w i t h one having a 90° phase difference w i t h respect to the other. 'Quadrature' and degrees of timing A complete cycle of alternating current or voltage can be regarded as occupying 360 degrees - a circle! A l t h o u g h this statement is somewhat arbitrary it is supported by sound reasoning. Consider a generator, for example; this w i l l , in the simplest case, rotate t h r o u g h 360 degrees and d u r i n g that period produce a complete sine wave.

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