| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology for detecting four TMCC (Transmission and Multiplexing Configuration and Control) signals in one segment while reducing power consumption in an OFDM receiver that corresponds to one-segment. <P>SOLUTION: An OFDM signal received by a tuner 12 is input to a TMCC demodulator 30 after frequency shift is corrected in a carrier derotator 26. An OFDM signal 101 of a time domain is distributed to four directions and respective distributed signals are multiplied by a first phase signal 111 to a fourth phase signal 114. A first phase to a fourth phase are phases of a subcarrier into which the TMCC signals are inserted. Multiplication values of the OFDM signal 101 and the first phase signal 111 to the fourth phase signal 114 are accumulated over one symbol, and four TMCC signals are output. A timing counting circuit 34 detects an EWS (Emergency Warning System) flag by referring to the 26-th bit of the TMCC signals. <P>COPYRIGHT: (C)2010,JPO&INPIT |
