TRANSMITTING DEVICE, TRANSMITTING METHOD, RECEIVING DEVICE, AND RECEIVING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent the deterioration of quality of a program being viewed when transmitting a plurality of program data over a transmission line in a bad noise environment such as wireless transmission.

SOLUTION: A key station 1 converts the data rate of the program data which varies from program to program based on the information on programs which require a high quality which is contained in upstream signals 12-15 sent from substations 2-5, and then outputs a multicast signal 11. By deteriorating the quality of programs not being viewed while raising the quality of programs being viewed, viewers can enjoy high-quality programs.

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