Digitalization of TV Master Control System

Abstract

Mainichi Broadcasting System pioneered Japanese commercial radio broadcasting in 1951. In commemoration of its 40th anniversary, the construction of the new headquarters was completed recently in Osaka. In order to achieve higher reliability of transmission, the TV master control system was digitalized. In the video system, the main switching equipment remains analog while signals coming out of the main switching equipment have been digitalized. In this way, cost saving performance has been attained. The audio system on the other hand is fully digitalized. Digital audio signals are directly supplied from the D2-VTR to this system. The digitalized TV master control system has the following features. (1) The characteristics of video and audio signals do not degrade easily. (2) As the full dual system is introduced, abnormality in the system in use can be automatically checked by the back-up system and the back-up system automatically activated, if necessary. (3) The self-diagnosis function makes the maintenance very easy.