| 摘要 |
A transmitting/receiving system and a receiving apparatus wherein a plurality of information signals having mutually different frequency bands processed through predetermined modulation are transmitted in time series from a transmitting apparatus via an electric power line. A desired information signal is selected out of the plural transmitted information signals, and the transmission quality of the selected information signal is measured. When the result representing the measured transmission quality is low, the signal being currently received is switched to the information signal having another frequency band indicating a better transmission quality.
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