| 摘要 |
PROBLEM TO BE SOLVED: To provide a reception electric field detection circuit for a receiver by which a response is made at a high speed. SOLUTION: A reception input signal 10 is received by a reception circuit 20 and a demodulator 21 and demodulated data 12 and a reception level signal 16 are obtained. A modulator 23 synthesizes again a modulation signal 13 from the demodulated data 12 demodulated once and an amplitude detector 24 detects the amplitude component to extract a level fluctuation of a modulation component of a received wave. The level fluctuation component and the reception level signal of the received wave are cancelled together by an analog subtractor 27 to cancel a level fluctuation resulting from the modulation component of the received wave so as to follow the rapid level fluctuation in the received wave. |
