HD-MAC coding of high definition television signals

The authors discuss the problem of MAC compatible broadcasting of a high definition television (HDTV) signal. The problem of MAC compatible broadcasting is studied as part of the Eureka 95 project and is called HD-MAC coding. The HD-MAC coding system is designed to achieve a bandwidth reduction factor of about 4. The authors describe several techniques that make this possible. The coding system presented is a synthesis of all the possible techniques that are under study. In practice the resulting system may not necessarily incorporate all these described techniques. An additional digital control signal of 1 Mb/sec. is transmitted in the vertical blanking interval. This signal is called the DATV signal where DATV stands for digitally assisted television