| 摘要 |
The amplitude level of a received signal is controlled by a variable gain amplifier and the amplitude level controlled received signal is converted to a digital signal by an A/D converter. Correlation or demodulation of the digitally converted signal is then established by a correlator. A correlated output comparator compares an output signal from the correlator with a prescribed threshold value to establish correlated synchronization using the output signal form the correlator and performs initial synchronization using the comparison output. The output amplitude level of the variable gain amplifier is controlled in accordance with an output amplitude from the correlator. The gain of the variable gain amplifier is switched to the maximum value by a switch dependent on presence of a synchronization establishment signal for the correlation synchronizing circuit.
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