| 摘要 |
PROBLEM TO BE SOLVED: To obtain a diversity synthesis circuit and a diversity synthesis method where a diversity receiver using an equalizer applied to a propagation line with fading always detects and monitors a signal level of each route and keeps a signal level after the synthesis. SOLUTION: A level reduction detection circuit 102(102a, 102b) detects presence of an input signal of transversal equalizers 101a, 101b of each route, a logic arithmetic circuit 105 output a signal denoting whether or not a level of a synthesis signal is controlled to an amplifier 104 on the basis of the detection result. Similarly an amplifier 107, a level reduction detection circuit 108 and a logic arithmetic circuit 109 control a signal after processed by a synthesizer 106. Since the signal level is controlled by the amplifier after the synthesis at interruption of the signal, saturation of the amplifier attended with remarkable fluctuation in a tap weight of the equalizer can be prevented and the amplifier can be operated at an optimum operating point at all times.
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