Television

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ISBN (13) : 978-81-224-2489-8

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To My Wife

PARKASH

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Preface
Out of the various television systems in use in different countries,India adopted the 625-B monochrome (black and white) and the compatible PAL-B colour systems. Most European and many other countries are also using these standards. However, majority of the available books on television deal with the American 525 line monochrome and NTSC colour systems. Moreover, in the latest editions of the popular books on this subject, emphasis has totally shifted to colourtelevision because of its wide acceptance in all the advanced countries. Since colour television has just been introduced in India, both monochrome and colour transmissions will co-exist for a long time in this country. Keeping these facts in view, this text has been prepared to provide an integrated approach with equal emphasis on both monochrome and colour systems. The book has been designed to meetthe requirements of a modern text book on ‘Television Engineering’ for Electrical and Electronics Engineering students at the degree level. It will also meet the needs of a comprehensive course on TV Engineering in Polytechnics and Technical Schools. In addition the book will be of immense value to practising engineers and technicians. Students engaged in self study will also benefit very much fromthis text. The matter has been so presented that any Engineering student with a basic knowledge of the various electronic building blocks and fundamentals of communication systems will have no difficulty in understanding the subject. Comprehensive design criteria for various sections of the receiver have been given in each chapter without going into rigorous mathematical details. Due emphasis hasalso been laid on TV receiver servicing and servicing equipment. Detailed charts for locating faults and trouble shootting together with alignment procedures for the various sections of the receiver have also been included. Early TV receivers manufactured in India and other countries used vacuum tube circuitry. However, with rapid advances in technology, hybrid circuitry soon came into use andtransistors replaced most vacuum tubes. With the widespread development of integrated circuits, special ICs are now available and are fast replacing discrete circuitry employing transistors. Since these developments have been very fast, sets employing tubes, only transistors and ICs are in use simultaneously. In view of this fact discussion of TV circuits using tubes, hybrid circuitry and ICs hasbeen included in the chapter devoted to receiver circuits. The stress, however, is more on solid state receiver circuits and design. Because of the importance of colour transmission and reception, two comprehensive chapters have been exclusively devoted to the techniques of colour television and various colour television systems. All modern colour receivers use solid-state devices in most sectionsof the receiver. It is natural that receivers manufactured in India will also be of this type with specially

designed ICs for performing almost all the functions in the receiver. Therefore, the description of colour receivers using vacuum tubes has been totally omitted. However, the functioning and use of special instruments necessary for the manufacture, testing and servicing all types of...