Information relay system and real-time data transmission for the information providing system for real-time data

摘要

PROBLEM TO BE SOLVED: To improve the communication efficiency and to reduce the service cost by transferring the most of information in the best effort class and in non-real time by means of the transmission lines of plural classes of different quality and a data storage means. SOLUTION: A data storage device 201 sends forward from the first time the real-time moving image data whose service quality is assured to a terminating device 205 via a port 201a and a circuit 213. At the same time, the moving image data are sent to a terminating device 206 from the end of a vide source via plural ports 201b and an inexpensive circuit 214 in the (best effort) service quality where the bit rate and the error rate are not always assured. Thus the image information is received after the its error is corrected. A storage device 207 stores the moving images which are sent from the end of the video source in the time trace-back direction. A stream control circuit 208 monitors the time stamps which are sent from both devices 205 and 206 and releases the real-time calls of high quality when the non-real time information is coincident with the real-time information.