Patent ID: 6341123
Filing Date: 2002-01-22
Classification: H04H,H04L

Abstract:
A digital audio broadcasting receiver comprising:a local oscillator corresponding to digital broadcasting of a multicarrier transmission system and used in the frequency shift of a received signal; complex Fourier transforming unit for subjecting the signal frequency-shifted by said local oscillator to complex discrete Fourier transformation; a differential demodulation unit for detecting a phase difference between two successive symbols on an identical carrier; a phase error detecting unit for detecting a phase error of output data from said differential demodulation unit; a storage unit for storing the phase error detected by said phase error detection unit; an average value processing unit for calculating an average value of phase errors of the carriers; a sign determining unit for determining a sign of an output from said average value processing unit; a phase error correcting unit for calculating an average value of an output from said sign determining unit and the phase error having the same sign as that of the output from said sign determining unit and stored in said storage unit; and a frequency tuning control unit to which an output from said phase error correcting unit is inputted and which controls a frequency of said local oscillator.