A control direction circuit (24) provides at least one of code error information
and code error correction information on a transmission signal for which compensation
has been performed by a plurality of compensation circuits (20a through
20e), to respective ones of the plurality of compensation circuits.
Thus, the control direction circuit (24) controls each of the compensation
circuits individually based on the thus-provided at least one of the code error
information and code error correction information so as to compensate the waveform
degradation on the transmission signal.
