Demodulating apparatus

Abstract

A demodulating apparatus according for demodulating a modulated signal obtained by modulating a plurality of carriers having different frequencies, includes a data demodulating circuit for demodulating data by frequency-analyzing a time waveform of the modulated signal which is formed of a data period of one modulation time and a guard interval succeeding the data period and which includes in the data period a period having correlation with the guard interval and provided at a position away from the modulated signal by the one modulation time, a correlation circuit for detecting correlation between the guard interval of the modulated signal and the period in the data period having correlation with the guard interval and provided at a position away from the modulated signal by the one modulation time, and a synchronization signal generating circuit including the correlation circuit and for generating a synchronization signal based on a detection output from the correlation circuit. The correlation is detected in a predetermined period which is 1/2 as long as each of the guard interval and the period having correlation with the guard interval and in which correlation can substantially be detected. Therefore, it is possible to shorten a time for generating the synchronization signal.

Dependencies are inferred from the claim text.