By Trundle E.
Common diagrams and a few pictures are integrated during this complete consultant to tv and video, with this variation now delivering the basics of electronic know-how. Trundle (he holds vast British certification for television expertise) has designed his consultant for provider engineers and digital servicing scholars, directing them within the technical procedures keen on making those machines paintings. the quantity can be utilized as a origin textual content for the appropriate urban and guilds certification classes within the united kingdom.
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Extra info for Newnes Guide to Television and Video Technology
Sample text
The new digital TV encoding and transmission systems discussed in Chapter 12 overcome these problems by totally different techniques, and give images free from these problems. 50 5 Transmission and reception At present most of our programmes come to us via the very large network of terrestrial UHF colour transmitters which has been built up since 1967 when the first UHF/colour broadcasts started on BBC2. In 1969, UHF colour broadcasting on BBC1 and ITV began, to be joined by Channel Four in 1982.
Display In our earlier example three separate display devices were used, one for each primary colour. Except in some forms of projection display this is not common, and as is well known a colour picture tube is generally used, in which all three 41 primary colour signals are handled simultaneously. We shall cover colour picture tubes in detail in Chapter 7; suffice it here to say that the shadowmask picture tube manages to simulate the effect of three superimposed tubes, each working in one primary colour.
The frequency, however, is just the same as the original carrier wave because it is composed of the original upper and lower sidebands, the average of which is the carrier frequency; but it can be seen that phase reversals occur each time the sine waves representing the top and bottom parts of the original envelope pass through the datum line. It is difficult to show these diagramatically; but the high-frequency signal changes phase by 180 degrees at each `envelope crossover' point, and this has a vital significance in colour encoding, as we shall see.