Demodulating apparatus and demodulating method

摘要

This invention relates to a demodulating apparatus and a demodulating method for demodulating an input signal more quickly than before when the channels of the input signal are inverted. A correlator 152 calculates a correlation value indicative of the correlation between a known delayed detection sequence made of symbols of correct delayed detection values of a known sequence inserted in the input signal and a received delayed detection sequence obtained through delay detection of the input signal. If the imaginary part of the correlation value is less than zero, a channel control section 132 switches the channels of the input signal before feeding the signal to a frame synchronization circuit 122. This invention can be applied illustratively to a satellite broadcast receiving apparatus.