Patent ID: 6982972

Claim:
A signal processing device of a multiplex communication, comprising: modulating means for modulating a plurality of information signals of multiplex communication sent in a transmission channel to produce a plurality of modulated signals; waveform reshaping means of first and second groups for reshaping waveforms of the modulated signals to produce a plurality of reshaped modulation signals; selecting means for selecting the waveform reshaping means of the first group or the waveform reshaping means of the second group according to a changeover signal and receiving the modulated signals produced by the modulating means; multiplying means of the first and second groups, which correspond to the waveform reshaping means of the first and second groups respectively, for multiplying each reshaped modulation signal produced by the waveform reshaping means of the corresponding group by a gain signal for each of the first and second groups to produce a plurality of electric power controlled signals; adding means for adding together the electric power controlled signals produced by the multiplying means of the first and second groups to produce a composite modulation signal corresponding to a transmission signal; and signal generating means for generating the changeover signal, which indicates the changeover from the waveform reshaping means of the first group corresponding to the reception of the modulated signals to the waveform reshaping means of the second group, in cases where an electric power gain value of the transmission signal is changed, sending the changeover signal to the selecting means, generating a new gain signal of which a new electric power gain value is changed from an electric power gain value of the gain signal, sending the new gain signal to the multiplying means corresponding to the waveform reshaping means of the second group, and successively sending the gain signal having the electric power gain value to the multiplying means corresponding to the waveform reshaping means of the first group during a prescribed time period after the change of the gain signal to the new gain signal.