| 摘要 |
An automatic frequency control device has an AFC mode controller (21) that changes over an operation mode according to a frequency deviation calculated in advance, phase rotation quantity detecting sections (22-1 to 22-n) and a maximum rate combiner (23) that detect a phase rotation quantity per unit time of outputs of a plurality of correlators according to a specified operation mode, a reliability calculating section (24) and an effective slot deciding section (25) that decide effectiveness or non-effectiveness of data in a receiving slot by using the outputs of the correlators, an n-slot averaging section (26) that averages a phase rotation quantity per unit time corresponding to an effective receiving slot, during an n slot time, a Deltaf calculating section (27) that calculates a frequency deviation based on a phase rotation quantity after averaging, and a VCO control voltage calculator (12) that carries out a VCO control when the reliability of the calculated frequency deviation exceeds a certain level.
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