| 摘要 |
<p>In order to enable multi-channel transmission by dividing frequency bands, a transmission unit and a reception unit are provided for each channel. The total number of channels is 3 or more. In any combination of two channels, with respect to the channel to which full-duplex bidirectional communication is applied, any of the reception units comprises a signal suppression unit which suppresses signal components of other channel which is a channel other than the own channel. According to a preferable embodiment, the reception unit has a frequency selection property for the own channel, and comprises an amplification unit which amplifies the received signals. With respect to adjacent channels to which full-duplex bidirectional communication is applied, the amplification unit comprises a gain suppression unit which suppresses the gain of the channel which is either the lower adjacent channel or the upper adjacent channel and which is deficient in the attenuation level of a gain frequency property.</p> |
