| 摘要 |
A signal receiving apparatus is provided with RF-AGC circuit 102 for amplifying a high frequency OFDM signal and converting the signal into an intermediate frequency OFDM signal, IF-AGC circuit 107 for amplifying the intermediate frequency OFDM signal, extracting circuit 211 for extracting SP signals regularly disposed in the intermediate frequency OFDM signal amplified by the IF-AGC circuit 107 , average-value calculating circuit 212 for calculating an average value of amplitudes of 144 SP signals extracted by the extracting circuit 211 , and DAC circuit 213 for generating a control signal based on the average value calculated by the average-value calculating circuit 212 , wherein the generated control signal is fed back to IF-AGC circuit 107 , thereby controlling gain of the circuit 107.
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