Patent ID: 6539065
Filing Date: 2003-03-25
Classification: H04H

Abstract:
A digital audio broadcasting receiver for receiving a plurality of transfer frames comprising a first transfer frame and a second transfer frame subsequent to the first transfer frame,each of the plurality of transfer frames containing a null symbol representing a start position of each transfer frame, a reference symbol representing known information, and a data symbol representing data to be transferred, wherein each of the null symbol, the reference symbol, and the data symbol includes a guard interval for preventing intersymbol interference due to a reflected wave, wherein the digital audio broadcasting receiver comprises: an analog-digital converter for converting the plurality of transfer frames from an analog signal format into a digital signal format based on a clock signal having a fixed frequency and for outputting the first transfer frame; a demodulator for demodulating the first transfer frame from a first frame processing start position for the first transfer frame; an audio decoder for generating audio data containing a plurality of audio samples based on the data symbol contained in the first transfer frame which has been demodulated by the demodulator; a transfer path characteristics calculator for generating a transfer path characteristics signal representing transfer path characteristics based on the reference symbol contained in the first transfer frame which has been demodulated by the demodulator; a frame processing start position control section, which includes the transfer path characteristics calculator, for controlling a second frame processing start position for the second transfer frame, by outputting to the demodulator a position control signal representing a difference between a predetermined frame processing reference start position and the first frame processing start position for the first transfer frame based on the transfer path characteristics signal, so that the second frame processing start position for the second transfer frame coincides with the predetermined frame processing reference start position; an audio sample discrepancy calculation section for calculating a discrepancy between a plurality of audio samples contained in audio data transmitted by a digital audio transmitter and the plurality of audio samples contained in the audio data generated by the audio decoder based on the position control signal; and an audio sample adjustment section for adjusting the number of audio samples contained in the audio data generated by the audio decoder, based on the audio sample discrepancy, and for selectively outputting audio reproduction data to be reproduced as sound.