Modern Trends in Colour TV Receiver Technology

Abstract

Since the first colour broadcast in 1953 in USA, considerable progress has taken place in this area all over the world in all the aspects of the technology. From delta-gun shadow-mask picture tubes in the fifties and early sixties, the colour TV recievers today are equipped with precision-in-line and trinitron colour picture tubes of high performance. The last decade, however, has the real distinction of seeing the most significant advances in the receiver technology not only due to improvements in TV picture tubes but also due to the astounding progress made in the field of semiconductor technology, which incidentally, contributed to the precision that could be achieved in preparation of shadow- mask for the colour picture tubes. The progress in the semiconductor technology has revolutionized circuit designs and concepts resulting in linear integrated circuits for different functional blocks of the receiver, making it more compact and reliable. Practically all aspects of receiver designs starting from the TV tuner to the deflection circuits have been affected by the boom in semiconductor technology.Lastly, the three colour TV standards i.e. NTSC, PAL and SECAM have been evolved and come to stay. Attempts to evolve a single standard for colour TV for international exchange of programmes and to cut down costs thereby, have evaded the international community.The present paper touches all the above aspects of the receiver technology and also gives a brief outline of the work done at CEERI.