On Construction Methods for Digital Video Networks

Construction methods for digital video networks which transmit various kinds of information signals are studied. It is pointed out that, in order to construct the actual video networks, such problems appear as the introductory process or changing process of the networks. Network flexibility, transparency, and cost performance are major requirements to consider, especially for video networks. To resolve these problems, three important items, i.e., codec arrangements, selective control of analog-digital circuits, and multiplexing with group switching, are taken up and examined. Several systems comprising new proposals are analyzed and compared with one another.