| 摘要 |
A signal from a differential detecting section is decoded by a data decision section and is inputted into a detection area judging section. In the detection area judging section, synchronous word patterns such as a unique word periodically inserted into the decoded data is detected, determination is made as to in which area the synchronous word pattern was detected, and in a case where it is judged by the capture determining section that frequency control is executed at an incorrect phase control point, a frequency deviation control section computes a control rate for a frequency deviation so that a detection area for the received signal will enter an area of a correct phase control point according to a detection area of the received signal, and the frequency deviation is corrected so that control is executed at the correct phase control point by adding a value corresponding to the control rate to an output value from the averaging filter section.
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