DEMODULATOR AND METHOD

摘要

A demodulator and a method capable of correctly demodulating an input signal more rapidly when a channel of the input signal is inverted. A correlator (152) calculates a correlation value indicating correlation between a known delay detection series which is a symbol series of a correct delay detection value of a known series inserted into the input signal and a received delay detection series that the input signal is delay-detected. A channel control part (132) changes the channel of the input signal and supplies it to a frame synchronization circuit (122) when an imaginary part of the correlation value is less than zero. This invention can be applied to a satellite receiver, for example.